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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05f360fc0b24296329c78fda852a1e9ae82de9cf7b27dae4b7f62f118f77b9ed"
+dependencies = [
+ "tap",
+]
+
+[[package]]
+name = "yansi"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09041cd90cf85f7f8b2df60c646f853b7f535ce68f85244eb6731cf89fa498ec"
+
+[[package]]
+name = "zeroize"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
+
+[[package]]
+name = "zip"
+version = "0.6.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "760394e246e4c28189f19d488c058bf16f564016aefac5d32bb1f3b51d5e9261"
+dependencies = [
+ "aes",
+ "byteorder",
+ "bzip2",
+ "constant_time_eq",
+ "crc32fast",
+ "crossbeam-utils",
+ "flate2",
+ "hmac",
+ "pbkdf2 0.11.0",
+ "sha1",
+ "time",
+ "zstd",
+]
+
+[[package]]
+name = "zstd"
+version = "0.11.2+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20cc960326ece64f010d2d2107537f26dc589a6573a316bd5b1dba685fa5fde4"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "5.0.2+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d2a5585e04f9eea4b2a3d1eca508c4dee9592a89ef6f450c11719da0726f4db"
+dependencies = [
+ "libc",
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.9+zstd.1.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e16efa8a874a0481a574084d34cc26fdb3b99627480f785888deb6386506656"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
diff --git a/apps/argus/Cargo.toml b/apps/argus/Cargo.toml
new file mode 100644
index 0000000000..5f62e866d0
--- /dev/null
+++ b/apps/argus/Cargo.toml
@@ -0,0 +1,53 @@
+[package]
+name = "argus"
+version = "0.0.1"
+edition = "2021"
+
+[lib]
+name = "argus"
+path = "src/lib.rs"
+
+[dependencies]
+anyhow = "1.0.75"
+axum = { version = "0.6.20", features = ["json", "ws", "macros"] }
+axum-macros = { version = "0.3.8" }
+base64 = { version = "0.21.0" }
+bincode = "1.3.3"
+byteorder = "1.5.0"
+clap = { version = "4.4.6", features = ["derive", "cargo", "env"] }
+ethabi = "18.0.0"
+ethers = { version = "2.0.14", features = ["ws"] }
+futures = { version = "0.3.28" }
+hex = "0.4.3"
+prometheus-client = { version = "0.21.2" }
+pythnet-sdk = { path = "../../pythnet/pythnet_sdk", features = ["strum"] }
+rand = "0.8.5"
+reqwest = { version = "0.11.22", features = ["json", "blocking"] }
+serde = { version = "1.0.188", features = ["derive"] }
+serde_qs = { version = "0.12.0", features = ["axum"] }
+serde_json = "1.0.107"
+serde_with = { version = "3.4.0", features = ["hex", "base64"] }
+serde_yaml = "0.9.25"
+sha3 = "0.10.8"
+tokio = { version = "1.33.0", features = ["full"] }
+tower-http = { version = "0.4.0", features = ["cors"] }
+tracing = { version = "0.1.37", features = ["log"] }
+tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }
+utoipa = { version = "3.4.0", features = ["axum_extras"] }
+utoipa-swagger-ui = { version = "3.1.4", features = ["axum"] }
+once_cell = "1.18.0"
+lazy_static = "1.4.0"
+url = "2.5.0"
+chrono = { version = "0.4.38", features = [
+  "clock",
+  "std",
+], default-features = false }
+backoff = { version = "0.4.0", features = ["futures", "tokio"] }
+thiserror = "1.0.61"
+futures-locks = "0.7.1"
+fortuna = { path = "../fortuna" }
+
+
+[dev-dependencies]
+axum-test = "13.1.1"
+mockito = "1.2.0"
diff --git a/apps/argus/Dockerfile b/apps/argus/Dockerfile
new file mode 100644
index 0000000000..c5e4fbec42
--- /dev/null
+++ b/apps/argus/Dockerfile
@@ -0,0 +1,18 @@
+ARG RUST_VERSION=1.82.0
+
+FROM rust:${RUST_VERSION} AS build
+
+# Build
+WORKDIR /src
+COPY apps/argus apps/argus
+COPY pythnet pythnet
+COPY target_chains/ethereum/entropy_sdk/solidity/abis target_chains/ethereum/entropy_sdk/solidity/abis
+
+WORKDIR /src/apps/argus
+
+RUN --mount=type=cache,target=/root/.cargo/registry cargo build --release
+
+
+FROM rust:${RUST_VERSION}
+# Copy artifacts from other images
+COPY --from=build /src/apps/argus/target/release/argus /usr/local/bin/
diff --git a/apps/argus/README.md b/apps/argus/README.md
new file mode 100644
index 0000000000..9a98e63653
--- /dev/null
+++ b/apps/argus/README.md
@@ -0,0 +1,51 @@
+# Argus
+
+Argus is a webservice that serves price updates according to the Pulse protocol.
+The webservice processes and delivers price updates to callers when permitted by the protocol.
+The service operates a keeper task that performs callback transactions for user requests.
+
+A single instance of this service can simultaneously serve price updates for several different blockchains.
+Each blockchain is configured in `config.yaml`.
+
+## Build & Test
+
+Argus uses Cargo for building and dependency management.
+Simply run `cargo build` and `cargo test` to build and test the project.
+
+## Command-Line Interface
+
+The Argus binary has a command-line interface to perform useful operations on the contract, such as
+registering a new price provider, or requesting price updates. To see the available commands, simply run `cargo run`.
+
+## Hermes Integration
+
+Argus integrates with the Hermes API to fetch price updates for fulfilling requests. When a price update request is received, Argus:
+
+1. Retrieves the request details from the blockchain
+2. Fetches the required price updates from Hermes using the `/v2/updates/price/{publish_time}` endpoint
+3. Executes the callback on the Pulse contract with the fetched price updates
+
+The Hermes client is implemented in the `keeper/hermes.rs` module and handles:
+
+- Converting price IDs to the format expected by Hermes
+- Fetching price updates from the Hermes API
+- Parsing the response and converting it to the format expected by the Pulse contract
+- Error handling and retries
+
+## Local Development
+
+To start an instance of the webserver for local testing, you first need to perform a few setup steps:
+
+1. Create a `config.yaml` file to point to the desired blockchains and Pulse contracts. Copy the content in `config.sample.yaml` and follow the directions inside to generate the necessary private keys and secrets.
+1. Make sure the wallets you have generated in step (1) contain some gas tokens for the configured networks.
+1. Run `cargo run -- setup-provider` to register a price provider for this service. This command
+   will update the on-chain contracts such that the configured provider key is a price provider,
+   and its on-chain configuration matches `config.yaml`.
+
+Once you've completed the setup, simply run the following command to start the service:
+
+```bash
+RUST_LOG=INFO cargo run -- run
+```
+
+This command will start the webservice on `localhost:34000`.
diff --git a/apps/argus/config.sample.yaml b/apps/argus/config.sample.yaml
new file mode 100644
index 0000000000..f32450d873
--- /dev/null
+++ b/apps/argus/config.sample.yaml
@@ -0,0 +1,77 @@
+chains:
+  linea_sepolia:
+    geth_rpc_addr: https://rpc.sepolia.linea.build
+    contract_addr: 0xEbe57e8045F2F230872523bbff7374986E45C486
+
+    # Keeper configuration for the chain
+    gas_limit: 500000
+
+    # Multiplier for the priority fee estimate, as a percentage (i.e., 100 = no change).
+    # Defaults to 100 if the field is omitted.
+    priority_fee_multiplier_pct: 100
+
+    escalation_policy:
+      # Pad the first callback transaction's gas estimate by 25%,
+      # then multiply each successive callback transaction's gas estimate by 10% until the cap is reached.
+      # All numbers are expressed as percentages where 100 = no change.
+      initial_gas_multiplier_pct: 125
+      gas_multiplier_pct: 110
+      gas_multiplier_cap_pct: 600
+
+      # Multiply successive callback transaction's fees by 10% until the cap is reached.
+      # All numbers are expressed as percentages where 100 = no change.
+      # (See also priority_fee_multiplier_pct above to generically adjust the priority fee estimates for the chain --
+      # adjusting that parameter will influence the fee of the first transaction, in addition to other things)
+      fee_multiplier_pct: 110
+      fee_multiplier_cap_pct: 200
+
+    min_keeper_balance: 100000000000000000
+
+    # Provider configuration
+    # How much to charge in fees
+    fee: 1500000000000000
+
+    # Configuration for dynamic fees under high gas prices. The keeper will set
+    # on-chain fees to make between [min_profit_pct, max_profit_pct] of the max callback
+    # cost in profit per transaction.
+    min_profit_pct: 0
+    target_profit_pct: 20
+    max_profit_pct: 100
+
+    # A list of block delays for processing blocks multiple times. Each number represents
+    # how many blocks to wait before processing. For example, [5, 10, 20] means process
+    # blocks after 5 blocks, then again after 10 blocks, and finally after 20 blocks.
+    block_delays: [5, 10, 20]
+
+provider:
+  uri: http://localhost:8080/
+  chain_length: 100000
+  chain_sample_interval: 10
+
+  # An ethereum wallet address and private key. Generate with `cast wallet new`
+  address: 0xADDRESS
+  private_key:
+    # For local development, you can hardcode the private key here
+    value: 0xabcd
+    # For production, you can store the private key in a file.
+    # file: provider-key.txt
+
+  # Set this to the address of your keeper wallet if you would like the keeper wallet to
+  # be able to withdraw fees from the contract.
+  fee_manager: 0xADDRESS
+keeper:
+  # An ethereum wallet address and private key for running the keeper service.
+  # This does not have to be the same key as the provider's key above.
+  # Generate with `cast wallet new`.
+  # The keeper private key can be omitted to run the webservice without the keeper.
+  private_key:
+    # For local development, you can hardcode the private key here
+    value: 0xabcd
+    # For production, you can store the private key in a file.
+    # file: keeper-key.txt
+
+# Hermes API configuration
+hermes:
+  # Base URL for the Hermes API
+  # This can be overridden by setting the HERMES_BASE_URL environment variable
+  base_url: https://hermes.pyth.network
diff --git a/apps/argus/rust-toolchain b/apps/argus/rust-toolchain
new file mode 100644
index 0000000000..71fae54fb2
--- /dev/null
+++ b/apps/argus/rust-toolchain
@@ -0,0 +1 @@
+1.82.0
diff --git a/apps/argus/src/api.rs b/apps/argus/src/api.rs
new file mode 100644
index 0000000000..3e0cd2b055
--- /dev/null
+++ b/apps/argus/src/api.rs
@@ -0,0 +1,447 @@
+use {
+    crate::chain::reader::PulseReader,
+    anyhow::Result,
+    axum::{
+        body::Body,
+        http::StatusCode,
+        response::{IntoResponse, Response},
+        routing::get,
+        Router,
+    },
+    ethers::core::types::Address,
+    prometheus_client::{
+        encoding::EncodeLabelSet,
+        metrics::{counter::Counter, family::Family},
+        registry::Registry,
+    },
+    std::{collections::HashMap, sync::Arc},
+    tokio::sync::RwLock,
+    url::Url,
+};
+pub use {chain_ids::*, index::*, live::*, metrics::*, price_updates::*, ready::*};
+
+mod chain_ids;
+mod index;
+mod live;
+mod metrics;
+mod price_updates;
+mod ready;
+
+pub type ChainId = String;
+
+#[derive(Clone, Debug, Hash, PartialEq, Eq, EncodeLabelSet)]
+pub struct RequestLabel {
+    pub value: String,
+}
+
+pub struct ApiMetrics {
+    pub http_requests: Family<RequestLabel, Counter>,
+}
+
+#[derive(Clone)]
+pub struct ApiState {
+    pub chains: Arc<HashMap<ChainId, BlockchainState>>,
+
+    pub metrics_registry: Arc<RwLock<Registry>>,
+
+    /// Prometheus metrics
+    pub metrics: Arc<ApiMetrics>,
+}
+
+impl ApiState {
+    pub async fn new(
+        chains: HashMap<ChainId, BlockchainState>,
+        metrics_registry: Arc<RwLock<Registry>>,
+    ) -> ApiState {
+        let metrics = ApiMetrics {
+            http_requests: Family::default(),
+        };
+
+        let http_requests = metrics.http_requests.clone();
+        metrics_registry.write().await.register(
+            "http_requests",
+            "Number of HTTP requests received",
+            http_requests,
+        );
+
+        ApiState {
+            chains: Arc::new(chains),
+            metrics: Arc::new(metrics),
+            metrics_registry,
+        }
+    }
+}
+
+/// The state of the price update service for a single blockchain.
+#[derive(Clone)]
+pub struct BlockchainState {
+    /// The chain id for this blockchain, useful for logging
+    pub id: ChainId,
+    /// The contract that the server is fulfilling requests for.
+    pub contract: Arc<dyn PulseReader>,
+    /// The address of the provider that this server is operating for.
+    pub provider_address: Address,
+}
+
+pub enum RestError {
+    /// The caller passed a sequence number that isn't within the supported range
+    InvalidSequenceNumber,
+    /// The caller passed an unsupported chain id
+    InvalidChainId,
+    /// The caller requested price updates that can't currently be provided (because they
+    /// haven't been committed to on-chain)
+    NoPendingRequest,
+    /// The server cannot currently communicate with the blockchain, so is not able to verify
+    /// which price updates have been requested.
+    TemporarilyUnavailable,
+    /// A catch-all error for all other types of errors that could occur during processing.
+    Unknown,
+}
+
+impl IntoResponse for RestError {
+    fn into_response(self) -> Response {
+        match self {
+            RestError::InvalidSequenceNumber => (
+                StatusCode::BAD_REQUEST,
+                "The sequence number is out of the permitted range",
+            )
+                .into_response(),
+            RestError::InvalidChainId => {
+                (StatusCode::BAD_REQUEST, "The chain id is not supported").into_response()
+            }
+            RestError::NoPendingRequest => (
+                StatusCode::FORBIDDEN,
+                "The request with the given sequence number has not been made yet, or the price updates have already been provided on chain.",
+            ).into_response(),
+            RestError::TemporarilyUnavailable => (
+                StatusCode::SERVICE_UNAVAILABLE,
+                "This service is temporarily unavailable",
+            )
+                .into_response(),
+            RestError::Unknown => (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                "An unknown error occurred processing the request",
+            )
+                .into_response(),
+        }
+    }
+}
+
+pub fn routes(state: ApiState) -> Router<(), Body> {
+    Router::new()
+        .route("/", get(index))
+        .route("/live", get(live))
+        .route("/metrics", get(metrics))
+        .route("/ready", get(ready))
+        .route("/v1/chains", get(chain_ids))
+        .route(
+            "/v1/chains/:chain_id/price-updates/:sequence",
+            get(price_update),
+        )
+        .with_state(state)
+}
+
+/// We are registering the provider on chain with the following url:
+/// `{base_uri}/v1/chains/{chain_id}`
+/// The path and API are highly coupled. Please be sure to keep them consistent.
+pub fn get_register_uri(base_uri: &str, chain_id: &str) -> Result<String> {
+    let base_uri = Url::parse(base_uri)?;
+    let path = format!("/v1/chains/{}", chain_id);
+    let uri = base_uri.join(&path)?;
+    Ok(uri.to_string())
+}
+
+#[cfg(test)]
+mod test {
+    use {
+        crate::{
+            api::{self, ApiState, BlockchainState},
+            chain::reader::mock::MockPulseReader,
+        },
+        axum::http::StatusCode,
+        axum_test::{TestResponse, TestServer},
+        ethers::prelude::{Address, U256},
+        lazy_static::lazy_static,
+        prometheus_client::registry::Registry,
+        std::{collections::HashMap, sync::Arc},
+        tokio::sync::RwLock,
+    };
+
+    const PROVIDER: Address = Address::zero();
+    lazy_static! {
+        static ref OTHER_PROVIDER: Address = Address::from_low_u64_be(1);
+    }
+
+    async fn test_server() -> (TestServer, Arc<MockPulseReader>, Arc<MockPulseReader>) {
+        let eth_read = Arc::new(MockPulseReader::with_requests(10, &[]));
+
+        let eth_state = BlockchainState {
+            id: "ethereum".into(),
+            contract: eth_read.clone(),
+            provider_address: PROVIDER,
+        };
+
+        let metrics_registry = Arc::new(RwLock::new(Registry::default()));
+
+        let avax_read = Arc::new(MockPulseReader::with_requests(10, &[]));
+
+        let avax_state = BlockchainState {
+            id: "avalanche".into(),
+            contract: avax_read.clone(),
+            provider_address: PROVIDER,
+        };
+
+        let mut chains = HashMap::new();
+        chains.insert("ethereum".into(), eth_state);
+        chains.insert("avalanche".into(), avax_state);
+
+        let api_state = ApiState::new(chains, metrics_registry).await;
+
+        let app = api::routes(api_state);
+        (TestServer::new(app).unwrap(), eth_read, avax_read)
+    }
+
+    async fn get_and_assert_status(
+        server: &TestServer,
+        path: &str,
+        status: StatusCode,
+    ) -> TestResponse {
+        let response = server.get(path).await;
+        response.assert_status(status);
+        response
+    }
+
+    // TODO: fix this test
+    // #[tokio::test]
+    // async fn test_price_updates() {
+    //     let (server, eth_contract, avax_contract) = test_server().await;
+    //     let empty_price_ids: Vec<[u8; 32]> = vec![];
+    //     let callback_gas_limit = U256::from(100000);
+    //     let publish_time = U256::from(1000);
+
+    //     // Can't access price updates if they haven't been requested
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/ethereum/price-updates/0",
+    //         StatusCode::FORBIDDEN,
+    //     )
+    //     .await;
+
+    //     // Once someone requests the price updates, then they are accessible
+    //     eth_contract.insert(
+    //         PROVIDER,
+    //         0,
+    //         callback_gas_limit,
+    //         empty_price_ids.clone(),
+    //         publish_time,
+    //     );
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/ethereum/price-updates/0",
+    //         StatusCode::OK,
+    //     )
+    //     .await;
+
+    //     // Each chain and provider has its own set of requests
+    //     eth_contract.insert(
+    //         PROVIDER,
+    //         100,
+    //         callback_gas_limit,
+    //         empty_price_ids.clone(),
+    //         publish_time,
+    //     );
+    //     eth_contract.insert(
+    //         *OTHER_PROVIDER,
+    //         101,
+    //         callback_gas_limit,
+    //         empty_price_ids.clone(),
+    //         publish_time,
+    //     );
+    //     eth_contract.insert(
+    //         PROVIDER,
+    //         102,
+    //         callback_gas_limit,
+    //         empty_price_ids.clone(),
+    //         publish_time,
+    //     );
+    //     avax_contract.insert(
+    //         PROVIDER,
+    //         102,
+    //         callback_gas_limit,
+    //         empty_price_ids.clone(),
+    //         publish_time,
+    //     );
+    //     avax_contract.insert(
+    //         PROVIDER,
+    //         103,
+    //         callback_gas_limit,
+    //         empty_price_ids.clone(),
+    //         publish_time,
+    //     );
+    //     avax_contract.insert(
+    //         *OTHER_PROVIDER,
+    //         104,
+    //         callback_gas_limit,
+    //         empty_price_ids.clone(),
+    //         publish_time,
+    //     );
+
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/ethereum/price-updates/100",
+    //         StatusCode::OK,
+    //     )
+    //     .await;
+
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/ethereum/price-updates/101",
+    //         StatusCode::FORBIDDEN,
+    //     )
+    //     .await;
+
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/ethereum/price-updates/102",
+    //         StatusCode::OK,
+    //     )
+    //     .await;
+
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/ethereum/price-updates/103",
+    //         StatusCode::FORBIDDEN,
+    //     )
+    //     .await;
+
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/ethereum/price-updates/104",
+    //         StatusCode::FORBIDDEN,
+    //     )
+    //     .await;
+
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/avalanche/price-updates/100",
+    //         StatusCode::FORBIDDEN,
+    //     )
+    //     .await;
+
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/avalanche/price-updates/101",
+    //         StatusCode::FORBIDDEN,
+    //     )
+    //     .await;
+
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/avalanche/price-updates/102",
+    //         StatusCode::OK,
+    //     )
+    //     .await;
+
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/avalanche/price-updates/103",
+    //         StatusCode::OK,
+    //     )
+    //     .await;
+
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/avalanche/price-updates/104",
+    //         StatusCode::FORBIDDEN,
+    //     )
+    //     .await;
+
+    //     // Bad chain ids fail
+    //     get_and_assert_status(
+    //         &server,
+    //         "/v1/chains/not_a_chain/price-updates/0",
+    //         StatusCode::BAD_REQUEST,
+    //     )
+    //     .await;
+    // }
+
+    #[tokio::test]
+    async fn test_price_update_confirmation_delay() {
+        let (server, eth_contract, avax_contract) = test_server().await;
+        let empty_price_ids: Vec<[u8; 32]> = vec![];
+        let callback_gas_limit = U256::from(100000);
+        let publish_time = U256::from(1000);
+
+        // No requests yet, so all requests should be forbidden
+        get_and_assert_status(
+            &server,
+            "/v1/chains/ethereum/price-updates/0",
+            StatusCode::FORBIDDEN,
+        )
+        .await;
+
+        get_and_assert_status(
+            &server,
+            "/v1/chains/avalanche/price-updates/100",
+            StatusCode::FORBIDDEN,
+        )
+        .await;
+
+        // Add requests - they should be immediately available
+        eth_contract.insert(
+            PROVIDER,
+            0,
+            callback_gas_limit,
+            empty_price_ids.clone(),
+            publish_time,
+        );
+        eth_contract.insert(
+            PROVIDER,
+            1,
+            callback_gas_limit,
+            empty_price_ids.clone(),
+            publish_time,
+        );
+        avax_contract.insert(
+            PROVIDER,
+            100,
+            callback_gas_limit,
+            empty_price_ids.clone(),
+            publish_time,
+        );
+
+        // All inserted requests should be immediately available
+        get_and_assert_status(
+            &server,
+            "/v1/chains/ethereum/price-updates/0",
+            StatusCode::OK,
+        )
+        .await;
+        get_and_assert_status(
+            &server,
+            "/v1/chains/ethereum/price-updates/1",
+            StatusCode::OK,
+        )
+        .await;
+        get_and_assert_status(
+            &server,
+            "/v1/chains/avalanche/price-updates/100",
+            StatusCode::OK,
+        )
+        .await;
+
+        // Non-inserted requests should still be forbidden
+        get_and_assert_status(
+            &server,
+            "/v1/chains/ethereum/price-updates/2",
+            StatusCode::FORBIDDEN,
+        )
+        .await;
+        get_and_assert_status(
+            &server,
+            "/v1/chains/avalanche/price-updates/101",
+            StatusCode::FORBIDDEN,
+        )
+        .await;
+    }
+}
diff --git a/apps/argus/src/api/chain_ids.rs b/apps/argus/src/api/chain_ids.rs
new file mode 100644
index 0000000000..0df175443f
--- /dev/null
+++ b/apps/argus/src/api/chain_ids.rs
@@ -0,0 +1,20 @@
+use {
+    crate::api::{ChainId, RestError},
+    anyhow::Result,
+    axum::{extract::State, Json},
+};
+
+/// Get the list of supported chain ids
+#[utoipa::path(
+get,
+path = "/v1/chains",
+responses(
+(status = 200, description = "Successfully retrieved the list of chain ids", body = GetRandomValueResponse),
+)
+)]
+pub async fn chain_ids(
+    State(state): State<crate::api::ApiState>,
+) -> Result<Json<Vec<ChainId>>, RestError> {
+    let chain_ids = state.chains.iter().map(|(id, _)| id.clone()).collect();
+    Ok(Json(chain_ids))
+}
diff --git a/apps/argus/src/api/index.rs b/apps/argus/src/api/index.rs
new file mode 100644
index 0000000000..e145ab3c7a
--- /dev/null
+++ b/apps/argus/src/api/index.rs
@@ -0,0 +1,15 @@
+use axum::{response::IntoResponse, Json};
+
+/// This is the index page for the REST service. It lists all the available endpoints.
+///
+/// TODO: Dynamically generate this list if possible.
+pub async fn index() -> impl IntoResponse {
+    Json([
+        "/",
+        "/live",
+        "/metrics",
+        "/ready",
+        "/v1/chains",
+        "/v1/chains/:chain_id/price-updates/:sequence"
+    ])
+}
diff --git a/apps/argus/src/api/live.rs b/apps/argus/src/api/live.rs
new file mode 100644
index 0000000000..2a6f8bff4d
--- /dev/null
+++ b/apps/argus/src/api/live.rs
@@ -0,0 +1,8 @@
+use axum::{
+    http::StatusCode,
+    response::{IntoResponse, Response},
+};
+
+pub async fn live() -> Response {
+    (StatusCode::OK, "OK").into_response()
+}
diff --git a/apps/argus/src/api/metrics.rs b/apps/argus/src/api/metrics.rs
new file mode 100644
index 0000000000..7977c58d96
--- /dev/null
+++ b/apps/argus/src/api/metrics.rs
@@ -0,0 +1,17 @@
+//! Exposing prometheus metrics via HTTP in openmetrics format.
+
+use {
+    axum::{extract::State, response::IntoResponse},
+    prometheus_client::encoding::text::encode,
+};
+
+pub async fn metrics(State(state): State<crate::api::ApiState>) -> impl IntoResponse {
+    let registry = state.metrics_registry.read().await;
+    let mut buffer = String::new();
+
+    // Should not fail if the metrics are valid and there is memory available
+    // to write to the buffer.
+    encode(&mut buffer, &registry).unwrap();
+
+    buffer
+}
diff --git a/apps/argus/src/api/price_updates.rs b/apps/argus/src/api/price_updates.rs
new file mode 100644
index 0000000000..9b003df148
--- /dev/null
+++ b/apps/argus/src/api/price_updates.rs
@@ -0,0 +1,124 @@
+use {
+    crate::api::{ChainId, RequestLabel, RestError},
+    anyhow::Result,
+    axum::{
+        extract::{Path, Query, State},
+        Json,
+    },
+    utoipa::{IntoParams, ToSchema},
+};
+
+/// Get price update data for a given sequence number and blockchain.
+///
+/// Given a sequence number, retrieve the corresponding price update data that this provider can deliver.
+/// This endpoint will not return the price data unless someone has requested the sequence number on-chain.
+///
+/// Every blockchain supported by this service has a distinct sequence of price updates and chain_id.
+/// Callers must pass the appropriate chain_id to ensure they fetch the correct price data.
+#[utoipa::path(
+get,
+path = "/v1/chains/{chain_id}/price-updates/{sequence}",
+responses(
+(status = 200, description = "Price update data successfully retrieved", body = GetPriceUpdateResponse),
+(status = 403, description = "Price update data cannot currently be retrieved", body = String)
+),
+params(PriceUpdatePathParams, PriceUpdateQueryParams)
+)]
+pub async fn price_update(
+    State(state): State<crate::api::ApiState>,
+    Path(PriceUpdatePathParams { chain_id, sequence }): Path<PriceUpdatePathParams>,
+    Query(PriceUpdateQueryParams { format }): Query<PriceUpdateQueryParams>,
+) -> Result<Json<GetPriceUpdateResponse>, RestError> {
+    let _ = format; // Ignore the unused variable
+
+    state
+        .metrics
+        .http_requests
+        .get_or_create(&RequestLabel {
+            value: "/v1/chains/{chain_id}/price-updates/{sequence}".to_string(),
+        })
+        .inc();
+
+    let state = state
+        .chains
+        .get(&chain_id)
+        .ok_or(RestError::InvalidChainId)?;
+
+    let maybe_request_fut = state.contract.get_request(sequence);
+
+    let maybe_request = maybe_request_fut.await.map_err(|e| {
+            tracing::error!(chain_id = chain_id, "RPC request failed {}", e);
+            RestError::TemporarilyUnavailable
+        })?;
+
+    match maybe_request {
+        Some(request) => {
+            // In a real implementation, we would fetch the price update data from a data source
+            // For now, we'll just return a mock response
+            let price_update_data =
+                generate_price_update_data(&request.price_ids, request.publish_time.as_u64());
+
+            Ok(Json(GetPriceUpdateResponse {
+                data: PriceUpdateData::new(price_update_data),
+            }))
+        }
+        None => Err(RestError::NoPendingRequest),
+    }
+}
+
+// Helper function to generate price update data based on price IDs and publish time
+// In a real implementation, this would fetch actual price data from a data source
+fn generate_price_update_data(price_ids: &[[u8; 32]], publish_time: u64) -> Vec<u8> {
+    // This is just a placeholder implementation
+    // In a real system, we would generate actual price update data
+    let mut data = Vec::new();
+
+    // Add publish time to the data
+    data.extend_from_slice(&publish_time.to_be_bytes());
+
+    // Add a simple representation of each price ID
+    for price_id in price_ids {
+        data.extend_from_slice(price_id);
+    }
+
+    data
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize, IntoParams)]
+#[into_params(parameter_in=Path)]
+pub struct PriceUpdatePathParams {
+    #[param(value_type = String)]
+    pub chain_id: ChainId,
+    pub sequence: u64,
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize, IntoParams)]
+#[into_params(parameter_in=Query)]
+pub struct PriceUpdateQueryParams {
+    pub format: Option<ResponseFormat>,
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize, ToSchema)]
+#[serde(rename_all = "kebab-case")]
+pub enum ResponseFormat {
+    #[serde(rename = "json")]
+    Json,
+    #[serde(rename = "binary")]
+    Binary,
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize, ToSchema, PartialEq)]
+pub struct GetPriceUpdateResponse {
+    pub data: PriceUpdateData,
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize, ToSchema, PartialEq)]
+pub struct PriceUpdateData {
+    data: Vec<u8>,
+}
+
+impl PriceUpdateData {
+    pub fn new(data: Vec<u8>) -> Self {
+        Self { data }
+    }
+}
diff --git a/apps/argus/src/api/ready.rs b/apps/argus/src/api/ready.rs
new file mode 100644
index 0000000000..d242106fd9
--- /dev/null
+++ b/apps/argus/src/api/ready.rs
@@ -0,0 +1,9 @@
+use axum::{
+    http::StatusCode,
+    response::{IntoResponse, Response},
+};
+
+pub async fn ready() -> Response {
+    // TODO: are there useful checks here? At the moment, everything important occurs synchronously on startup.
+    (StatusCode::OK, "OK").into_response()
+}
diff --git a/apps/argus/src/chain.rs b/apps/argus/src/chain.rs
new file mode 100644
index 0000000000..34724c3b76
--- /dev/null
+++ b/apps/argus/src/chain.rs
@@ -0,0 +1,2 @@
+pub mod ethereum;
+pub mod reader;
diff --git a/apps/argus/src/chain/ethereum.rs b/apps/argus/src/chain/ethereum.rs
new file mode 100644
index 0000000000..738dd39e7f
--- /dev/null
+++ b/apps/argus/src/chain/ethereum.rs
@@ -0,0 +1,317 @@
+use {
+    crate::{
+        api::ChainId,
+        chain::reader::{self, BlockNumber, PulseReader, RequestedWithCallbackEvent},
+        config::EthereumConfig,
+    },
+    anyhow::{anyhow, Context, Result},
+    axum::async_trait,
+    ethers::{
+        abi::RawLog,
+        contract::{abigen, EthLogDecode},
+        core::types::Address,
+        middleware::{gas_oracle::GasOracleMiddleware, SignerMiddleware},
+        prelude::JsonRpcClient,
+        providers::{Http, Middleware, Provider},
+        signers::{LocalWallet, Signer},
+        types::U256,
+    },
+    fortuna::eth_utils::{
+        eth_gas_oracle::EthProviderOracle,
+        legacy_tx_middleware::LegacyTxMiddleware,
+        nonce_manager::NonceManagerMiddleware,
+        traced_client::{RpcMetrics, TracedClient},
+    },
+    std::sync::Arc,
+};
+
+// TODO: Programmatically generate this so we don't have to keep committed ABI in sync with the
+// contract in the same repo.
+abigen!(
+    Pulse,
+    "../../target_chains/ethereum/contracts/out/IPulse.sol/IPulse.abi.json"
+);
+
+pub type MiddlewaresWrapper<T> = LegacyTxMiddleware<
+    GasOracleMiddleware<
+        NonceManagerMiddleware<SignerMiddleware<Provider<T>, LocalWallet>>,
+        EthProviderOracle<Provider<T>>,
+    >,
+>;
+
+pub type SignablePythContractInner<T> = Pulse<MiddlewaresWrapper<T>>;
+pub type SignablePythContract = SignablePythContractInner<Http>;
+pub type InstrumentedSignablePythContract = SignablePythContractInner<TracedClient>;
+
+pub type PythContract = Pulse<Provider<Http>>;
+pub type InstrumentedPythContract = Pulse<Provider<TracedClient>>;
+
+impl<T: JsonRpcClient + 'static + Clone> SignablePythContractInner<T> {
+    /// Get the wallet that signs transactions sent to this contract.
+    pub fn wallet(&self) -> LocalWallet {
+        self.client().inner().inner().inner().signer().clone()
+    }
+
+    /// Get the underlying provider that communicates with the blockchain.
+    pub fn provider(&self) -> Provider<T> {
+        self.client().inner().inner().inner().provider().clone()
+    }
+
+    /// Submit a request for price updates to the contract.
+    ///
+    /// This method is a version of the autogenned `requestPriceUpdatesWithCallback` method that parses the emitted logs
+    /// to return the sequence number of the created Request.
+    pub async fn request_price_updates_wrapper(
+        &self,
+        publish_time: U256,
+        price_ids: Vec<[u8; 32]>,
+        callback_gas_limit: U256,
+    ) -> Result<u64> {
+        let fee = self.get_fee(callback_gas_limit).call().await?;
+
+        if let Some(r) = self
+            .request_price_updates_with_callback(publish_time, price_ids, callback_gas_limit)
+            .value(fee)
+            .send()
+            .await?
+            .await?
+        {
+            // Extract Log from TransactionReceipt.
+            let l: RawLog = r.logs[0].clone().into();
+            if let PulseEvents::PriceUpdateRequestedFilter(r) = PulseEvents::decode_log(&l)? {
+                Ok(r.request.sequence_number)
+            } else {
+                Err(anyhow!("No log with sequence number"))
+            }
+        } else {
+            Err(anyhow!("Request failed"))
+        }
+    }
+
+    /// Execute the callback for a price update request.
+    ///
+    /// This method is a version of the autogenned `executeCallback` method that parses the emitted logs
+    /// to return the updated price IDs.
+    pub async fn execute_callback_wrapper(
+        &self,
+        sequence_number: u64,
+        update_data: Vec<Vec<u8>>,
+        price_ids: Vec<[u8; 32]>,
+    ) -> Result<Vec<[u8; 32]>> {
+        if let Some(r) = self
+            .execute_callback(
+                sequence_number,
+                update_data
+                    .into_iter()
+                    .map(ethers::types::Bytes::from)
+                    .collect(),
+                price_ids.clone(),
+            )
+            .send()
+            .await?
+            .await?
+        {
+            if let PulseEvents::PriceUpdateExecutedFilter(r) =
+                PulseEvents::decode_log(&r.logs[0].clone().into())?
+            {
+                Ok(r.price_ids.to_vec())
+            } else {
+                Err(anyhow!("No log with price updates"))
+            }
+        } else {
+            Err(anyhow!("Request failed"))
+        }
+    }
+
+    pub async fn from_config_and_provider(
+        chain_config: &EthereumConfig,
+        private_key: &str,
+        provider: Provider<T>,
+    ) -> Result<SignablePythContractInner<T>> {
+        let chain_id = provider.get_chainid().await?;
+        let gas_oracle =
+            EthProviderOracle::new(provider.clone(), chain_config.priority_fee_multiplier_pct);
+        let wallet__ = private_key
+            .parse::<LocalWallet>()?
+            .with_chain_id(chain_id.as_u64());
+
+        let address = wallet__.address();
+
+        Ok(Pulse::new(
+            chain_config.contract_addr,
+            Arc::new(LegacyTxMiddleware::new(
+                chain_config.legacy_tx,
+                GasOracleMiddleware::new(
+                    NonceManagerMiddleware::new(SignerMiddleware::new(provider, wallet__), address),
+                    gas_oracle,
+                ),
+            )),
+        ))
+    }
+}
+
+impl SignablePythContract {
+    pub async fn from_config(chain_config: &EthereumConfig, private_key: &str) -> Result<Self> {
+        let provider = Provider::<Http>::try_from(&chain_config.geth_rpc_addr)?;
+        Self::from_config_and_provider(chain_config, private_key, provider).await
+    }
+}
+
+impl InstrumentedSignablePythContract {
+    pub async fn from_config(
+        chain_config: &EthereumConfig,
+        private_key: &str,
+        chain_id: ChainId,
+        metrics: Arc<RpcMetrics>,
+    ) -> Result<Self> {
+        let provider = TracedClient::new(chain_id, &chain_config.geth_rpc_addr, metrics)?;
+        Self::from_config_and_provider(chain_config, private_key, provider).await
+    }
+}
+
+impl PythContract {
+    pub fn from_config(chain_config: &EthereumConfig) -> Result<Self> {
+        let provider = Provider::<Http>::try_from(&chain_config.geth_rpc_addr)?;
+
+        Ok(Pulse::new(chain_config.contract_addr, Arc::new(provider)))
+    }
+}
+
+impl InstrumentedPythContract {
+    pub fn from_config(
+        chain_config: &EthereumConfig,
+        chain_id: ChainId,
+        metrics: Arc<RpcMetrics>,
+    ) -> Result<Self> {
+        let provider = TracedClient::new(chain_id, &chain_config.geth_rpc_addr, metrics)?;
+
+        Ok(Pulse::new(chain_config.contract_addr, Arc::new(provider)))
+    }
+}
+
+#[async_trait]
+impl<T: JsonRpcClient + 'static> PulseReader for Pulse<Provider<T>> {
+    async fn get_request(&self, sequence_number: u64) -> Result<Option<reader::Request>> {
+        let r = self
+            .get_request(sequence_number)
+            // TODO: This doesn't work for lighlink right now. Figure out how to do this in lightlink
+            // .block(ethers::core::types::BlockNumber::Finalized)
+            .call()
+            .await?;
+
+        // sequence_number == 0 means the request does not exist.
+        if r.sequence_number != 0 {
+            Ok(Some(reader::Request {
+                requester: r.requester,
+                sequence_number: r.sequence_number,
+                callback_gas_limit: r.callback_gas_limit,
+                price_ids: r.price_ids.to_vec(),
+                publish_time: r.publish_time,
+                num_price_ids: r.num_price_ids,
+            }))
+        } else {
+            Ok(None)
+        }
+    }
+
+    async fn get_block_number(&self) -> Result<BlockNumber> {
+        let block = self
+            .client()
+            .get_block_number()
+            .await
+            .context("Failed to get block number")?;
+        Ok(block.as_u64())
+    }
+
+    async fn get_active_requests(&self, count: usize) -> Result<Vec<reader::Request>> {
+        let (requests, actual_count) = self.get_first_active_requests(count.into()).call().await?;
+
+        // Convert actual_count (U256) to usize safely
+        let actual_count_usize = actual_count.as_u64() as usize;
+        let mut result = Vec::with_capacity(actual_count_usize);
+
+        for i in 0..actual_count_usize {
+            let r = &requests[i];
+            if r.sequence_number != 0 {
+                result.push(reader::Request {
+                    requester: r.requester,
+                    sequence_number: r.sequence_number,
+                    callback_gas_limit: r.callback_gas_limit,
+                    price_ids: r.price_ids.to_vec(),
+                    publish_time: r.publish_time,
+                    num_price_ids: r.num_price_ids,
+                });
+            }
+        }
+
+        Ok(result)
+    }
+
+    async fn get_price_update_requested_events(
+        &self,
+        from_block: BlockNumber,
+        to_block: BlockNumber,
+    ) -> Result<Vec<RequestedWithCallbackEvent>> {
+        let mut event = self.price_update_requested_filter();
+        event.filter = event.filter.from_block(from_block).to_block(to_block);
+
+        let res: Vec<PriceUpdateRequestedFilter> = event.query().await?;
+
+        Ok(res
+            .iter()
+            .map(|r| RequestedWithCallbackEvent {
+                sequence_number: r.request.sequence_number,
+                requester: r.request.requester,
+                price_ids: r.price_ids.to_vec(),
+                callback_gas_limit: r.request.callback_gas_limit,
+            })
+            .collect())
+    }
+
+    async fn estimate_execute_callback_gas(
+        &self,
+        sender: Address,
+        sequence_number: u64,
+        update_data: Vec<Vec<u8>>,
+        price_ids: Vec<[u8; 32]>,
+    ) -> Result<U256> {
+        let result = self
+            .execute_callback(
+                sequence_number,
+                update_data
+                    .into_iter()
+                    .map(ethers::types::Bytes::from)
+                    .collect(),
+                price_ids,
+            )
+            .from(sender)
+            .estimate_gas()
+            .await;
+
+        result.map_err(|e| e.into())
+    }
+}
+
+impl<T: JsonRpcClient + 'static> Pulse<Provider<T>> {
+    /// Get the current sequence number from the contract.
+    ///
+    /// This method directly accesses the contract's storage to get the currentSequenceNumber.
+    pub async fn get_current_sequence_number(&self) -> Result<u64> {
+        // The currentSequenceNumber is stored in the State struct at slot 0, offset 32 bytes
+        // (after admin, pythFeeInWei, accruedFeesInWei, and pyth)
+        let storage_slot = ethers::types::H256::zero();
+        let storage_value = self
+            .client()
+            .get_storage_at(self.address(), storage_slot, None)
+            .await?;
+
+        // H256 is always 32 bytes, so we don't need to check the length
+
+        // The currentSequenceNumber is stored at offset 32 bytes in the storage slot
+        // Extract the last 8 bytes (u64) from the 32-byte value
+        let mut u64_bytes = [0u8; 8];
+        u64_bytes.copy_from_slice(&storage_value.as_bytes()[24..32]);
+
+        Ok(u64::from_be_bytes(u64_bytes))
+    }
+}
diff --git a/apps/argus/src/chain/reader.rs b/apps/argus/src/chain/reader.rs
new file mode 100644
index 0000000000..bdae9776e9
--- /dev/null
+++ b/apps/argus/src/chain/reader.rs
@@ -0,0 +1,174 @@
+use {
+    anyhow::Result,
+    axum::async_trait,
+    ethers::types::{Address, U256},
+};
+
+pub type BlockNumber = u64;
+
+#[derive(Clone)]
+pub struct RequestedWithCallbackEvent {
+    pub sequence_number: u64,
+    pub requester: Address,
+    pub price_ids: Vec<[u8; 32]>,
+    pub callback_gas_limit: U256,
+}
+
+/// PulseReader is the read-only interface of the Pulse contract.
+#[async_trait]
+pub trait PulseReader: Send + Sync {
+    /// Get an in-flight request (if it exists)
+    async fn get_request(&self, sequence_number: u64) -> Result<Option<Request>>;
+
+    /// Get the latest block number
+    async fn get_block_number(&self) -> Result<BlockNumber>;
+
+    async fn get_price_update_requested_events(
+        &self,
+        from_block: BlockNumber,
+        to_block: BlockNumber,
+    ) -> Result<Vec<RequestedWithCallbackEvent>>;
+
+    /// Alias for get_price_update_requested_events to maintain compatibility with existing code
+    async fn get_request_with_callback_events(
+        &self,
+        from_block: BlockNumber,
+        to_block: BlockNumber,
+    ) -> Result<Vec<RequestedWithCallbackEvent>> {
+        self.get_price_update_requested_events(from_block, to_block)
+            .await
+    }
+
+    /// Get active requests directly from contract storage
+    /// This is more efficient than searching for events in the backlog
+    async fn get_active_requests(&self, count: usize) -> Result<Vec<Request>>;
+
+    /// Estimate the gas required to execute a callback for price updates.
+    async fn estimate_execute_callback_gas(
+        &self,
+        sender: Address,
+        sequence_number: u64,
+        update_data: Vec<Vec<u8>>,
+        price_ids: Vec<[u8; 32]>,
+    ) -> Result<U256>;
+}
+
+/// An in-flight request stored in the contract.
+/// (This struct is missing many fields that are defined in the contract, as they
+/// aren't used in argus anywhere. Feel free to add any missing fields as necessary.)
+#[derive(Clone, Debug)]
+pub struct Request {
+    pub requester: Address,
+    pub sequence_number: u64,
+    pub callback_gas_limit: U256,
+    pub price_ids: Vec<[u8; 32]>,
+    pub publish_time: U256,
+    pub num_price_ids: u8,
+}
+
+#[cfg(test)]
+pub mod mock {
+    use {
+        crate::chain::reader::{BlockNumber, PulseReader, Request, RequestedWithCallbackEvent},
+        anyhow::Result,
+        axum::async_trait,
+        ethers::types::{Address, U256},
+        std::sync::RwLock,
+    };
+
+    /// Mock version of the pulse contract intended for testing.
+    /// This class is internally locked to allow tests to modify the in-flight requests while
+    /// the API is also holding a pointer to the same data structure.
+    pub struct MockPulseReader {
+        block_number: RwLock<BlockNumber>,
+        /// The set of requests that are currently in-flight.
+        requests: RwLock<Vec<Request>>,
+    }
+
+    impl MockPulseReader {
+        pub fn with_requests(
+            block_number: BlockNumber,
+            requests: &[(Address, u64, BlockNumber, U256, Vec<[u8; 32]>, U256)],
+        ) -> MockPulseReader {
+            MockPulseReader {
+                block_number: RwLock::new(block_number),
+                requests: RwLock::new(
+                    requests
+                        .iter()
+                        .map(|&(a, s, _, c, ref p, t)| Request {
+                            requester: a,
+                            sequence_number: s,
+                            callback_gas_limit: c,
+                            price_ids: p.clone(),
+                            publish_time: t,
+                            num_price_ids: p.len().min(255) as u8,
+                        })
+                        .collect(),
+                ),
+            }
+        }
+
+        /// Insert a new request into the set of in-flight requests.
+        pub fn insert(
+            &self,
+            requester: Address,
+            sequence: u64,
+            callback_gas_limit: U256,
+            price_ids: Vec<[u8; 32]>,
+            publish_time: U256,
+        ) -> &Self {
+            self.requests.write().unwrap().push(Request {
+                requester,
+                sequence_number: sequence,
+                callback_gas_limit,
+                price_ids: price_ids.clone(),
+                publish_time,
+                num_price_ids: price_ids.len().min(255) as u8,
+            });
+            self
+        }
+
+        pub fn set_block_number(&self, block_number: BlockNumber) -> &Self {
+            *(self.block_number.write().unwrap()) = block_number;
+            self
+        }
+    }
+
+    #[async_trait]
+    impl PulseReader for MockPulseReader {
+        async fn get_request(&self, sequence_number: u64) -> Result<Option<Request>> {
+            let requests = self.requests.read().unwrap();
+            Ok(requests
+                .iter()
+                .find(|r| r.sequence_number == sequence_number)
+                .cloned())
+        }
+
+        async fn get_block_number(&self) -> Result<BlockNumber> {
+            Ok(*self.block_number.read().unwrap())
+        }
+
+        async fn get_active_requests(&self, count: usize) -> Result<Vec<Request>> {
+            let requests = self.requests.read().unwrap();
+            Ok(requests.iter().take(count).cloned().collect())
+        }
+
+        async fn get_price_update_requested_events(
+            &self,
+            _from_block: BlockNumber,
+            _to_block: BlockNumber,
+        ) -> Result<Vec<RequestedWithCallbackEvent>> {
+            Ok(vec![])
+        }
+
+        async fn estimate_execute_callback_gas(
+            &self,
+            _sender: Address,
+            _sequence_number: u64,
+            _update_data: Vec<Vec<u8>>,
+            _price_ids: Vec<[u8; 32]>,
+        ) -> Result<U256> {
+            Ok(U256::from(5))
+        }
+    }
+}
diff --git a/apps/argus/src/command.rs b/apps/argus/src/command.rs
new file mode 100644
index 0000000000..66d4d8bddb
--- /dev/null
+++ b/apps/argus/src/command.rs
@@ -0,0 +1,14 @@
+mod generate;
+mod get_request;
+mod inspect;
+mod register_provider;
+mod request_price_update;
+mod run;
+mod setup_provider;
+mod withdraw_fees;
+
+pub use {
+    generate::generate, get_request::get_request, inspect::inspect,
+    register_provider::register_provider, request_price_update::request_price_update, run::run,
+    setup_provider::setup_provider, withdraw_fees::withdraw_fees,
+};
diff --git a/apps/argus/src/command/generate.rs b/apps/argus/src/command/generate.rs
new file mode 100644
index 0000000000..7cd6540a83
--- /dev/null
+++ b/apps/argus/src/command/generate.rs
@@ -0,0 +1,80 @@
+use {
+    crate::{
+        chain::ethereum::{PulseEvents, SignablePythContract},
+        config::{Config, GenerateOptions},
+    },
+    anyhow::{anyhow, Result},
+    ethers::{contract::EthLogDecode, types::Bytes},
+    std::sync::Arc,
+};
+
+/// Request a price update from the Pulse contract and execute the callback.
+pub async fn generate(opts: &GenerateOptions) -> Result<()> {
+    let contract = Arc::new(
+        SignablePythContract::from_config(
+            &Config::load(&opts.config.config)?.get_chain_config(&opts.chain_id)?,
+            &opts.private_key,
+        )
+        .await?,
+    );
+
+    // Define the price IDs we want to update
+    // In a real implementation, these would come from configuration or command line arguments
+    let price_ids: Vec<[u8; 32]> = vec![];
+    if price_ids.is_empty() {
+        return Err(anyhow!("No price IDs specified for update"));
+    }
+
+    // Request a price update on the contract
+    // The publish_time would typically be the current time or a specific time in the future
+    let publish_time = chrono::Utc::now().timestamp() as u64;
+    let callback_gas_limit = 500000; // Example gas limit for the callback
+
+    let sequence_number = contract
+        .request_price_updates_with_callback(
+            publish_time.into(),
+            price_ids.clone(),
+            callback_gas_limit.into(),
+        )
+        .send()
+        .await?
+        .await?
+        .ok_or_else(|| anyhow!("Failed to get transaction receipt"))?
+        .logs
+        .iter()
+        .find_map(|log| {
+            let raw_log = ethers::abi::RawLog::from(log.clone());
+            if let Ok(PulseEvents::PriceUpdateRequestedFilter(event_data)) =
+                PulseEvents::decode_log(&raw_log)
+            {
+                Some(event_data.request.sequence_number)
+            } else {
+                None
+            }
+        })
+        .ok_or_else(|| anyhow!("Failed to find sequence number in transaction logs"))?;
+
+    tracing::info!(sequence_number = sequence_number, "Price update requested");
+
+    // In a real implementation, we would fetch price data from a source
+    // For this example, we'll use empty update data
+    let update_data: Vec<Bytes> = vec![];
+
+    // Execute the callback with the price data
+    let result = contract
+        .execute_callback(sequence_number, update_data, price_ids)
+        .send()
+        .await?
+        .await?;
+
+    if let Some(receipt) = result {
+        tracing::info!(
+            transaction_hash = ?receipt.transaction_hash,
+            "Price update callback executed successfully"
+        );
+    } else {
+        tracing::error!("Price update callback failed: no receipt returned");
+    }
+
+    Ok(())
+}
diff --git a/apps/argus/src/command/get_request.rs b/apps/argus/src/command/get_request.rs
new file mode 100644
index 0000000000..cc00ef7598
--- /dev/null
+++ b/apps/argus/src/command/get_request.rs
@@ -0,0 +1,24 @@
+use {
+    crate::{
+        chain::ethereum::PythContract,
+        config::{Config, GetRequestOptions},
+    },
+    anyhow::Result,
+    std::sync::Arc,
+};
+
+/// Get the on-chain request metadata for a provider and sequence number.
+pub async fn get_request(opts: &GetRequestOptions) -> Result<()> {
+    // Initialize a Provider to interface with the EVM contract.
+    let contract = Arc::new(PythContract::from_config(
+        &Config::load(&opts.config.config)?.get_chain_config(&opts.chain_id)?,
+    )?);
+
+    let r = contract
+        .get_request(opts.sequence)
+        .call()
+        .await?;
+    tracing::info!("Found request: {:?}", r);
+
+    Ok(())
+}
diff --git a/apps/argus/src/command/inspect.rs b/apps/argus/src/command/inspect.rs
new file mode 100644
index 0000000000..47b236e3c6
--- /dev/null
+++ b/apps/argus/src/command/inspect.rs
@@ -0,0 +1,122 @@
+use {
+    crate::{
+        chain::ethereum::{PythContract, Request},
+        config::{Config, EthereumConfig, InspectOptions},
+    },
+    anyhow::Result,
+    ethers::{
+        contract::Multicall,
+        middleware::Middleware,
+        prelude::{Http, Provider},
+    },
+    std::time::{Duration, SystemTime},
+};
+
+pub async fn inspect(opts: &InspectOptions) -> Result<()> {
+    match opts.chain_id.clone() {
+        Some(chain_id) => {
+            let chain_config = &Config::load(&opts.config.config)?.get_chain_config(&chain_id)?;
+            inspect_chain(chain_config, opts.num_requests, opts.multicall_batch_size).await?;
+        }
+        None => {
+            let config = Config::load(&opts.config.config)?;
+            for (chain_id, chain_config) in config.chains.iter() {
+                println!("Inspecting chain: {}", chain_id);
+                inspect_chain(chain_config, opts.num_requests, opts.multicall_batch_size).await?;
+            }
+        }
+    }
+    Ok(())
+}
+
+async fn inspect_chain(
+    chain_config: &EthereumConfig,
+    num_requests: u64,
+    multicall_batch_size: u64,
+) -> Result<()> {
+    let rpc_provider = Provider::<Http>::try_from(&chain_config.geth_rpc_addr)?;
+    let multicall_exists = rpc_provider
+        .get_code(ethers::contract::MULTICALL_ADDRESS, None)
+        .await
+        .expect("Failed to get code")
+        .len()
+        > 0;
+
+    let contract = PythContract::from_config(chain_config)?;
+
+    // Get the current sequence number directly from the contract's storage
+    let current_sequence_number = contract.get_current_sequence_number().await?;
+
+    // The current sequence number is the next one to be assigned, so subtract 1 to get the latest
+    let latest_sequence_number = current_sequence_number.saturating_sub(1);
+    let mut current_request_number = latest_sequence_number;
+
+    println!("Latest sequence number: {}", current_request_number);
+
+    if current_request_number == 0 {
+        println!("No requests found");
+        return Ok(());
+    }
+
+    let last_request_number = current_request_number.saturating_sub(num_requests);
+
+    if multicall_exists {
+        println!("Using multicall");
+        let mut multicall = Multicall::new(
+            rpc_provider.clone(),
+            Some(ethers::contract::MULTICALL_ADDRESS),
+        )
+        .await?;
+        while current_request_number > last_request_number {
+            multicall.clear_calls();
+            for _ in 0..multicall_batch_size {
+                if current_request_number == 0 {
+                    break;
+                }
+                multicall.add_call(contract.get_request(current_request_number), false);
+                current_request_number -= 1;
+            }
+            let return_data: Vec<Request> = multicall.call_array().await?;
+            for request in return_data {
+                process_request(request).await?;
+            }
+            println!("Current request number: {}", current_request_number);
+        }
+    } else {
+        println!("Multicall not deployed in this chain, fetching requests one by one");
+        while current_request_number > last_request_number {
+            let request = contract.get_request(current_request_number).call().await?;
+            process_request(request).await?;
+            current_request_number -= 1;
+            if current_request_number % 100 == 0 {
+                println!("Current request number: {}", current_request_number);
+            }
+        }
+    }
+    Ok(())
+}
+
+async fn process_request(request: Request) -> Result<()> {
+    if request.sequence_number != 0 {
+        // Convert publish_time to a datetime
+        let publish_time = request.publish_time.as_u64();
+        let datetime = if publish_time > 0 {
+            match SystemTime::UNIX_EPOCH.checked_add(Duration::from_secs(publish_time)) {
+                Some(time) => format!("{:?}", time),
+                None => "Invalid time".to_string(),
+            }
+        } else {
+            "N/A".to_string()
+        };
+
+        println!(
+            "{} sequence_number:{} publish_time:{} requester:{} price_ids:{}",
+            datetime,
+            request.sequence_number,
+            request.publish_time,
+            request.requester,
+            request.price_ids.len()
+        );
+    }
+    Ok(())
+}
diff --git a/apps/argus/src/command/register_provider.rs b/apps/argus/src/command/register_provider.rs
new file mode 100644
index 0000000000..c8ad1d2955
--- /dev/null
+++ b/apps/argus/src/command/register_provider.rs
@@ -0,0 +1,54 @@
+use {
+    crate::{
+        chain::ethereum::SignablePythContract,
+        config::{Config, EthereumConfig, ProviderConfig, RegisterProviderOptions},
+    },
+    anyhow::{anyhow, Result},
+    ethers::signers::{LocalWallet, Signer},
+    std::sync::Arc,
+};
+
+/// Register as a price update provider. This method will register the provider with the Pulse contract.
+pub async fn register_provider(opts: &RegisterProviderOptions) -> Result<()> {
+    let config = Config::load(&opts.config.config)?;
+    let chain_config = config.get_chain_config(&opts.chain_id)?;
+
+    register_provider_from_config(&config.provider, &chain_config).await?;
+
+    Ok(())
+}
+
+pub async fn register_provider_from_config(
+    provider_config: &ProviderConfig,
+    chain_config: &EthereumConfig,
+) -> Result<()> {
+    let private_key_string = provider_config.private_key.load()?.ok_or(anyhow!(
+        "Please specify a provider private key in the config"
+    ))?;
+
+    // Initialize a Provider to interface with the EVM contract.
+    let contract =
+        Arc::new(SignablePythContract::from_config(chain_config, &private_key_string).await?);
+
+    let wallet = private_key_string.parse::<LocalWallet>()?;
+    let provider_address = wallet.address();
+
+    // Register the provider with the contract
+    tracing::info!("Registering provider with address: {:?}", provider_address);
+    tracing::info!("Provider fee: {}", chain_config.fee);
+
+    // Register the provider with the fee
+    if let Some(receipt) = contract
+        .register_provider(chain_config.fee)
+        .send()
+        .await?
+        .await?
+    {
+        tracing::info!("Provider registration successful: {:?}", receipt);
+    } else {
+        tracing::error!("Provider registration failed: no receipt returned");
+        return Err(anyhow!("Provider registration failed: no receipt returned"));
+    }
+
+    Ok(())
+}
diff --git a/apps/argus/src/command/request_price_update.rs b/apps/argus/src/command/request_price_update.rs
new file mode 100644
index 0000000000..6231f653db
--- /dev/null
+++ b/apps/argus/src/command/request_price_update.rs
@@ -0,0 +1,64 @@
+use {
+    crate::{
+        chain::ethereum::SignablePythContract,
+        config::{Config, RequestPriceUpdateOptions},
+    },
+    anyhow::{anyhow, Result},
+    ethers::types::U256,
+    std::{sync::Arc, time::{SystemTime, UNIX_EPOCH}},
+};
+
+pub async fn request_price_update(opts: &RequestPriceUpdateOptions) -> Result<()> {
+    let contract = Arc::new(
+        SignablePythContract::from_config(
+            &Config::load(&opts.config.config)?.get_chain_config(&opts.chain_id)?,
+            &opts.private_key,
+        )
+        .await?,
+    );
+
+    // Parse price IDs (now required)
+    let price_ids = parse_price_ids(&opts.price_ids)?;
+
+    // Use current timestamp as publish time
+    let current_time = SystemTime::now().duration_since(UNIX_EPOCH)?.as_secs();
+    let publish_time = U256::from(current_time);
+
+    // Set callback gas limit from options
+    let callback_gas_limit = U256::from(opts.callback_gas_limit);
+
+    // Request price updates with callback
+    let sequence_number = contract
+        .request_price_updates_wrapper(publish_time, price_ids, callback_gas_limit)
+        .await?;
+
+    tracing::info!("Price update requested with sequence number: {:#?}", sequence_number);
+
+    Ok(())
+}
+
+// Helper function to parse comma-separated hex strings into price IDs
+fn parse_price_ids(price_ids_str: &str) -> Result<Vec<[u8; 32]>> {
+    let ids: Vec<&str> = price_ids_str.split(',').map(|s| s.trim()).collect();
+
+    if ids.is_empty() {
+        return Err(anyhow!("No price IDs provided. Please specify at least one price ID."));
+    }
+
+    let mut result = Vec::with_capacity(ids.len());
+
+    for id_str in ids {
+        let id_str = id_str.trim_start_matches("0x");
+        if id_str.len() != 64 {
+            return Err(anyhow!("Invalid price ID format: {}. Expected 32-byte hex string (64 characters)", id_str));
+        }
+
+        let mut id = [0u8; 32];
+        hex::decode_to_slice(id_str, &mut id)
+            .map_err(|e| anyhow!("Failed to decode price ID {}: {}", id_str, e))?;
+
+        result.push(id);
+    }
+
+    Ok(result)
+}
diff --git a/apps/argus/src/command/run.rs b/apps/argus/src/command/run.rs
new file mode 100644
index 0000000000..d95931eaef
--- /dev/null
+++ b/apps/argus/src/command/run.rs
@@ -0,0 +1,316 @@
+use {
+    crate::{
+        api::{self, BlockchainState, ChainId},
+        chain::ethereum::InstrumentedPythContract,
+        config::{Config, EthereumConfig, RunOptions},
+        keeper::{self, keeper_metrics::KeeperMetrics},
+    },
+    anyhow::{anyhow, Error, Result},
+    axum::Router,
+    ethers::{
+        middleware::Middleware,
+        types::{Address, BlockNumber},
+    },
+    fortuna::eth_utils::traced_client::{RpcMetrics, TracedClient},
+    futures::future::join_all,
+    prometheus_client::{
+        encoding::EncodeLabelSet,
+        metrics::{family::Family, gauge::Gauge},
+        registry::Registry,
+    },
+    std::{
+        collections::HashMap,
+        net::SocketAddr,
+        sync::Arc,
+        time::{Duration, SystemTime, UNIX_EPOCH},
+    },
+    tokio::{
+        spawn,
+        sync::{watch, RwLock},
+        time,
+    },
+    tower_http::cors::CorsLayer,
+    utoipa::OpenApi,
+    utoipa_swagger_ui::SwaggerUi,
+};
+
+/// Track metrics in this interval
+const TRACK_INTERVAL: Duration = Duration::from_secs(10);
+
+pub async fn run_api(
+    socket_addr: SocketAddr,
+    chains: HashMap<String, api::BlockchainState>,
+    metrics_registry: Arc<RwLock<Registry>>,
+    mut rx_exit: watch::Receiver<bool>,
+) -> Result<()> {
+    #[derive(OpenApi)]
+    #[openapi(
+    paths(
+    crate::api::price_update,
+    crate::api::chain_ids,
+    ),
+    components(
+    schemas(
+    crate::api::GetPriceUpdateResponse,
+    crate::api::PriceUpdateData,
+    crate::api::ResponseFormat,
+    )
+    ),
+    tags(
+    (name = "argus", description = "Price update service for the Pyth Pulse protocol")
+    )
+    )]
+    struct ApiDoc;
+
+    let api_state = api::ApiState::new(chains, metrics_registry).await;
+
+    // Initialize Axum Router. Note the type here is a `Router<State>` due to the use of the
+    // `with_state` method which replaces `Body` with `State` in the type signature.
+    let app = Router::new();
+    let app = app
+        .merge(SwaggerUi::new("/docs").url("/docs/openapi.json", ApiDoc::openapi()))
+        .merge(api::routes(api_state))
+        // Permissive CORS layer to allow all origins
+        .layer(CorsLayer::permissive());
+
+    tracing::info!("Starting server on: {:?}", &socket_addr);
+    // Binds the axum's server to the configured address and port. This is a blocking call and will
+    // not return until the server is shutdown.
+    axum::Server::try_bind(&socket_addr)?
+        .serve(app.into_make_service())
+        .with_graceful_shutdown(async {
+            // It can return an error or an Ok(()). In both cases, we would shut down.
+            // As Ok(()) means, exit signal (ctrl + c) was received.
+            // And Err(e) means, the sender was dropped which should not be the case.
+            let _ = rx_exit.changed().await;
+
+            tracing::info!("Shutting down RPC server...");
+        })
+        .await?;
+
+    Ok(())
+}
+
+pub async fn run_keeper(
+    chains: HashMap<String, api::BlockchainState>,
+    config: Config,
+    private_key: String,
+    metrics_registry: Arc<RwLock<Registry>>,
+    rpc_metrics: Arc<RpcMetrics>,
+    hermes_base_url: String,
+) -> Result<()> {
+    let mut handles = Vec::new();
+    let keeper_metrics: Arc<KeeperMetrics> = Arc::new({
+        let chain_labels: Vec<(String, Address)> = chains
+            .iter()
+            .map(|(id, state)| (id.clone(), state.provider_address))
+            .collect();
+        KeeperMetrics::new(metrics_registry.clone(), chain_labels).await
+    });
+    for (chain_id, chain_config) in chains {
+        let chain_eth_config = config
+            .chains
+            .get(&chain_id)
+            .expect("All chains should be present in the config file")
+            .clone();
+        let private_key = private_key.clone();
+        handles.push(spawn(keeper::run_keeper_threads(
+            private_key,
+            chain_eth_config,
+            chain_config.clone(),
+            keeper_metrics.clone(),
+            rpc_metrics.clone(),
+            hermes_base_url.clone(),
+        )));
+    }
+
+    Ok(())
+}
+
+pub async fn run(opts: &RunOptions) -> Result<()> {
+    let config = Config::load(&opts.config.config)?;
+    let (tx_exit, rx_exit) = watch::channel(false);
+    let metrics_registry = Arc::new(RwLock::new(Registry::default()));
+    let rpc_metrics = Arc::new(RpcMetrics::new(metrics_registry.clone()).await);
+
+    // Store the hermes base URL from the command-line argument
+    let hermes_base_url = opts.hermes_base_url.clone();
+
+    let mut tasks = Vec::new();
+    for (chain_id, chain_config) in config.chains.clone() {
+        let rpc_metrics = rpc_metrics.clone();
+        tasks.push(spawn(async move {
+            let state = setup_chain_state(
+                &config.provider.address,
+                &chain_id,
+                &chain_config,
+                rpc_metrics,
+            )
+            .await;
+
+            (chain_id, state)
+        }));
+    }
+    let states = join_all(tasks).await;
+
+    let mut chains: HashMap<ChainId, BlockchainState> = HashMap::new();
+    for result in states {
+        let (chain_id, state) = result?;
+
+        match state {
+            Ok(state) => {
+                chains.insert(chain_id.clone(), state);
+            }
+            Err(e) => {
+                tracing::error!("Failed to setup {} {}", chain_id, e);
+            }
+        }
+    }
+    if chains.is_empty() {
+        return Err(anyhow!("No chains were successfully setup"));
+    }
+
+    // Listen for Ctrl+C so we can set the exit flag and wait for a graceful shutdown.
+    spawn(async move {
+        tracing::info!("Registered shutdown signal handler...");
+        tokio::signal::ctrl_c().await.unwrap();
+        tracing::info!("Shut down signal received, waiting for tasks...");
+        // no need to handle error here, as it will only occur when all the
+        // receiver has been dropped and that's what we want to do
+        tx_exit.send(true)?;
+
+        Ok::<(), Error>(())
+    });
+
+    if let Some(keeper_private_key) = config.keeper.private_key.load()? {
+        spawn(run_keeper(
+            chains.clone(),
+            config.clone(),
+            keeper_private_key,
+            metrics_registry.clone(),
+            rpc_metrics.clone(),
+            hermes_base_url.clone(),
+        ));
+    } else {
+        tracing::info!("Not starting keeper service: no keeper private key specified. Please add one to the config if you would like to run the keeper service.")
+    }
+
+    // Spawn a thread to track latest block lag. This helps us know if the rpc is up and updated with the latest block.
+    spawn(track_block_timestamp_lag(
+        config,
+        metrics_registry.clone(),
+        rpc_metrics.clone(),
+    ));
+
+    run_api(opts.addr, chains, metrics_registry, rx_exit).await?;
+
+    Ok(())
+}
+
+async fn setup_chain_state(
+    provider: &Address,
+    chain_id: &ChainId,
+    chain_config: &EthereumConfig,
+    rpc_metrics: Arc<RpcMetrics>,
+) -> Result<BlockchainState> {
+    let contract = Arc::new(InstrumentedPythContract::from_config(
+        chain_config,
+        chain_id.clone(),
+        rpc_metrics,
+    )?);
+
+    // Verify the provider is registered
+    let provider_info = contract.get_provider_info(*provider).call().await?;
+    if !provider_info.is_registered {
+        return Err(anyhow!(
+            "Provider {} is not registered on chain {}",
+            provider,
+            chain_id
+        ));
+    }
+
+    tracing::info!("Provider {} is registered on chain {}", provider, chain_id);
+
+    let state = BlockchainState {
+        id: chain_id.clone(),
+        contract,
+        provider_address: *provider,
+    };
+    Ok(state)
+}
+
+#[derive(Clone, Debug, Hash, PartialEq, Eq, EncodeLabelSet)]
+pub struct ChainLabel {
+    pub chain_id: String,
+}
+
+#[tracing::instrument(name = "block_timestamp_lag", skip_all, fields(chain_id = chain_id))]
+pub async fn check_block_timestamp_lag(
+    chain_id: String,
+    chain_config: EthereumConfig,
+    metrics: Family<ChainLabel, Gauge>,
+    rpc_metrics: Arc<RpcMetrics>,
+) {
+    let provider =
+        match TracedClient::new(chain_id.clone(), &chain_config.geth_rpc_addr, rpc_metrics) {
+            Ok(r) => r,
+            Err(e) => {
+                tracing::error!("Failed to create provider for chain id - {:?}", e);
+                return;
+            }
+        };
+
+    const INF_LAG: i64 = 1000000; // value that definitely triggers an alert
+    let lag = match provider.get_block(BlockNumber::Latest).await {
+        Ok(block) => match block {
+            Some(block) => {
+                let block_timestamp = block.timestamp;
+                let server_timestamp = SystemTime::now()
+                    .duration_since(UNIX_EPOCH)
+                    .unwrap()
+                    .as_secs();
+                let lag: i64 = (server_timestamp as i64) - (block_timestamp.as_u64() as i64);
+                lag
+            }
+            None => {
+                tracing::error!("Block is None");
+                INF_LAG
+            }
+        },
+        Err(e) => {
+            tracing::error!("Failed to get block - {:?}", e);
+            INF_LAG
+        }
+    };
+    metrics
+        .get_or_create(&ChainLabel {
+            chain_id: chain_id.clone(),
+        })
+        .set(lag);
+}
+
+/// Tracks the difference between the server timestamp and the latest block timestamp for each chain
+pub async fn track_block_timestamp_lag(
+    config: Config,
+    metrics_registry: Arc<RwLock<Registry>>,
+    rpc_metrics: Arc<RpcMetrics>,
+) {
+    let metrics = Family::<ChainLabel, Gauge>::default();
+    metrics_registry.write().await.register(
+        "block_timestamp_lag",
+        "The difference between server timestamp and latest block timestamp",
+        metrics.clone(),
+    );
+    loop {
+        for (chain_id, chain_config) in &config.chains {
+            spawn(check_block_timestamp_lag(
+                chain_id.clone(),
+                chain_config.clone(),
+                metrics.clone(),
+                rpc_metrics.clone(),
+            ));
+        }
+
+        time::sleep(TRACK_INTERVAL).await;
+    }
+}
diff --git a/apps/argus/src/command/setup_provider.rs b/apps/argus/src/command/setup_provider.rs
new file mode 100644
index 0000000000..8f4f9105ad
--- /dev/null
+++ b/apps/argus/src/command/setup_provider.rs
@@ -0,0 +1,136 @@
+use {
+    crate::{
+        api::ChainId,
+        chain::ethereum::{ProviderInfo, SignablePythContract},
+        command::register_provider::register_provider_from_config,
+        config::{Config, EthereumConfig, SetupProviderOptions},
+    },
+    anyhow::{anyhow, Result},
+    ethers::{
+        signers::{LocalWallet, Signer},
+        types::Address,
+    },
+    futures::future::join_all,
+    std::sync::Arc,
+    tokio::spawn,
+    tracing::Instrument,
+};
+
+/// Setup provider for all the chains.
+pub async fn setup_provider(opts: &SetupProviderOptions) -> Result<()> {
+    let config = Config::load(&opts.config.config)?;
+    let setup_tasks = config
+        .chains
+        .clone()
+        .into_iter()
+        .map(|(chain_id, chain_config)| {
+            let config = config.clone();
+            spawn(async move {
+                (
+                    setup_chain_provider(&config, &chain_id, &chain_config).await,
+                    chain_id,
+                )
+            })
+        })
+        .collect::<Vec<_>>();
+    let join_results = join_all(setup_tasks).await;
+    let mut all_ok = true;
+    for join_result in join_results {
+        let (setup_result, chain_id) = join_result?;
+        match setup_result {
+            Ok(()) => {}
+            Err(e) => {
+                tracing::error!("Failed to setup {} {}", chain_id, e);
+                all_ok = false;
+            }
+        }
+    }
+
+    match all_ok {
+        true => Ok(()),
+        false => Err(anyhow!("Failed to setup provider for all chains")),
+    }
+}
+
+/// Setup provider for a single chain.
+/// 1. Register if there was no previous registration.
+/// 2. Update provider fee if there is a mismatch with the fee set on contract.
+/// 3. Update fee manager if there is a mismatch with the fee manager set on contract.
+#[tracing::instrument(name = "setup_chain_provider", skip_all, fields(chain_id = chain_id))]
+async fn setup_chain_provider(
+    config: &Config,
+    chain_id: &ChainId,
+    chain_config: &EthereumConfig,
+) -> Result<()> {
+    tracing::info!("Setting up provider for chain: {0}", chain_id);
+    let provider_config = &config.provider;
+    let private_key = provider_config.private_key.load()?.ok_or(anyhow!(
+        "Please specify a provider private key in the config file."
+    ))?;
+    let provider_address = private_key.clone().parse::<LocalWallet>()?.address();
+    // Initialize a Provider to interface with the EVM contract.
+    let contract = Arc::new(SignablePythContract::from_config(chain_config, &private_key).await?);
+
+    tracing::info!("Fetching provider info");
+    let provider_info = contract.get_provider_info(provider_address).call().await?;
+    tracing::info!("Provider info: {:?}", provider_info);
+
+    // Register if the provider is not already registered
+    if !provider_info.is_registered {
+        tracing::info!("Provider not registered, registering now");
+        register_provider_from_config(provider_config, chain_config)
+            .await
+            .map_err(|e| anyhow!("Chain: {} - Failed to register provider: {}", &chain_id, e))?;
+        tracing::info!("Registered");
+    }
+
+    // Fetch updated provider info after registration
+    let provider_info = contract.get_provider_info(provider_address).call().await?;
+
+    sync_fee(&contract, &provider_info, chain_config.fee)
+        .in_current_span()
+        .await?;
+
+    sync_fee_manager(
+        &contract,
+        &provider_info,
+        provider_config.fee_manager.unwrap_or(Address::zero()),
+    )
+    .in_current_span()
+    .await?;
+
+    Ok(())
+}
+
+async fn sync_fee(
+    contract: &Arc<SignablePythContract>,
+    provider_info: &ProviderInfo,
+    provider_fee: u128,
+) -> Result<()> {
+    if provider_info.fee_in_wei != provider_fee {
+        tracing::info!("Updating provider fee {}", provider_fee);
+        if let Some(r) = contract
+            .set_provider_fee(provider_fee)
+            .send()
+            .await?
+            .await?
+        {
+            tracing::info!("Updated provider fee: {:?}", r);
+        }
+    }
+    Ok(())
+}
+
+async fn sync_fee_manager(
+    contract: &Arc<SignablePythContract>,
+    provider_info: &ProviderInfo,
+    fee_manager: Address,
+) -> Result<()> {
+    if provider_info.fee_manager != fee_manager {
+        tracing::info!("Updating provider fee manager to {:?}", fee_manager);
+        if let Some(receipt) = contract.set_fee_manager(fee_manager).send().await?.await? {
+            tracing::info!("Updated provider fee manager: {:?}", receipt);
+        }
+    }
+    Ok(())
+}
diff --git a/apps/argus/src/command/withdraw_fees.rs b/apps/argus/src/command/withdraw_fees.rs
new file mode 100644
index 0000000000..c037d0bfcd
--- /dev/null
+++ b/apps/argus/src/command/withdraw_fees.rs
@@ -0,0 +1,90 @@
+use {
+    crate::{
+        chain::ethereum::SignablePythContract,
+        config::{Config, WithdrawFeesOptions},
+    },
+    anyhow::{anyhow, Result},
+    ethers::{signers::Signer, types::Address},
+};
+
+pub async fn withdraw_fees(opts: &WithdrawFeesOptions) -> Result<()> {
+    let config = Config::load(&opts.config.config)?;
+
+    let private_key_string = if opts.keeper {
+        config.keeper.private_key.load()?.ok_or(anyhow!("Please specify a keeper private key in the config or omit the --keeper option to use the provider private key"))?
+    } else {
+        config.provider.private_key.load()?.ok_or(anyhow!(
+            "Please specify a provider private key in the config or provide the --keeper option to use the keeper private key instead."
+        ))?
+    };
+
+    match opts.chain_id.clone() {
+        Some(chain_id) => {
+            let chain_config = &config.get_chain_config(&chain_id)?;
+            let contract =
+                SignablePythContract::from_config(chain_config, &private_key_string).await?;
+
+            withdraw_fees_for_chain(
+                contract,
+                config.provider.address,
+                opts.keeper,
+                opts.retain_balance_wei,
+            )
+            .await?;
+        }
+        None => {
+            for (chain_id, chain_config) in config.chains.iter() {
+                tracing::info!("Withdrawing fees for chain: {}", chain_id);
+                let contract =
+                    SignablePythContract::from_config(chain_config, &private_key_string).await?;
+
+                withdraw_fees_for_chain(
+                    contract,
+                    config.provider.address,
+                    opts.keeper,
+                    opts.retain_balance_wei,
+                )
+                .await?;
+            }
+        }
+    }
+    Ok(())
+}
+
+pub async fn withdraw_fees_for_chain(
+    contract: SignablePythContract,
+    provider_address: Address,
+    is_fee_manager: bool,
+    retained_balance: u128,
+) -> Result<()> {
+    tracing::info!("Fetching fees for provider: {:?}", provider_address);
+    let provider_info = contract.get_provider_info(provider_address).call().await?;
+    let fees = provider_info.accrued_fees_in_wei;
+    tracing::info!("Accrued fees: {} wei", fees);
+
+    let withdrawal_amount_wei = fees.saturating_sub(retained_balance);
+    if withdrawal_amount_wei > 0 {
+        tracing::info!(
+            "Withdrawing {} wei to {}...",
+            withdrawal_amount_wei,
+            contract.wallet().address()
+        );
+
+        let call = match is_fee_manager {
+            true => contract.withdraw_as_fee_manager(provider_address, withdrawal_amount_wei),
+            false => contract.withdraw_fees(withdrawal_amount_wei),
+        };
+        let tx_result = call.send().await?.await?;
+
+        match &tx_result {
+            Some(receipt) => {
+                tracing::info!("Withdrawal transaction hash {:?}", receipt.transaction_hash);
+            }
+            None => {
+                tracing::warn!("No transaction receipt. Unclear what happened to the transaction");
+            }
+        }
+    }
+
+    Ok(())
+}
diff --git a/apps/argus/src/config.rs b/apps/argus/src/config.rs
new file mode 100644
index 0000000000..e499d08509
--- /dev/null
+++ b/apps/argus/src/config.rs
@@ -0,0 +1,325 @@
+use {
+    crate::api::ChainId,
+    anyhow::{anyhow, Result},
+    clap::{crate_authors, crate_description, crate_name, crate_version, Args, Parser},
+    ethers::types::Address,
+    fortuna::eth_utils::utils::EscalationPolicy,
+    std::{collections::HashMap, fs},
+};
+pub use {
+    generate::GenerateOptions, get_request::GetRequestOptions, inspect::InspectOptions,
+    register_provider::RegisterProviderOptions, request_price_update::RequestPriceUpdateOptions,
+    run::RunOptions, setup_provider::SetupProviderOptions, withdraw_fees::WithdrawFeesOptions,
+};
+
+mod generate;
+mod get_request;
+mod inspect;
+mod register_provider;
+mod request_price_update;
+mod run;
+mod setup_provider;
+mod withdraw_fees;
+
+const DEFAULT_RPC_ADDR: &str = "127.0.0.1:34000";
+const DEFAULT_HTTP_ADDR: &str = "http://127.0.0.1:34000";
+const DEFAULT_HERMES_BASE_URL: &str = "https://hermes.pyth.network";
+
+#[derive(Parser, Debug)]
+#[command(name = crate_name!())]
+#[command(author = crate_authors!())]
+#[command(about = crate_description!())]
+#[command(version = crate_version!())]
+#[allow(clippy::large_enum_variant)]
+pub enum Options {
+    /// Run the Price Update Service.
+    Run(RunOptions),
+
+    /// Register a new provider with the Pyth Pulse contract.
+    RegisterProvider(RegisterProviderOptions),
+
+    /// Set up the provider for all the provided chains.
+    /// It registers, re-registers, or updates provider config on chain.
+    SetupProvider(SetupProviderOptions),
+
+    /// Request a price update from the contract.
+    RequestPriceUpdate(RequestPriceUpdateOptions),
+
+    /// Inspect recent requests and find unfulfilled price update requests.
+    Inspect(InspectOptions),
+
+    /// Generate a price update by running the entire protocol end-to-end
+    Generate(GenerateOptions),
+
+    /// Get the status of a pending request for a price update.
+    GetRequest(GetRequestOptions),
+
+    /// Withdraw any of the provider's accumulated fees from the contract.
+    WithdrawFees(WithdrawFeesOptions),
+}
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Config Options")]
+#[group(id = "Config")]
+pub struct ConfigOptions {
+    /// Path to a configuration file containing the list of supported blockchains
+    #[arg(long = "config")]
+    #[arg(env = "ARGUS_CONFIG")]
+    #[arg(default_value = "config.yaml")]
+    pub config: String,
+}
+
+#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
+pub struct Config {
+    pub chains: HashMap<ChainId, EthereumConfig>,
+    pub provider: ProviderConfig,
+    pub keeper: KeeperConfig,
+}
+
+impl Config {
+    pub fn load(path: &str) -> Result<Config> {
+        // Open and read the YAML file
+        // TODO: the default serde deserialization doesn't enforce unique keys
+        let yaml_content = fs::read_to_string(path)?;
+        let config: Config = serde_yaml::from_str(&yaml_content)?;
+
+        // Run correctness checks for the config and fail if there are any issues.
+        for (chain_id, config) in config.chains.iter() {
+            if !(config.min_profit_pct <= config.target_profit_pct
+                && config.target_profit_pct <= config.max_profit_pct)
+            {
+                return Err(anyhow!("chain id {:?} configuration is invalid. Config must satisfy min_profit_pct <= target_profit_pct <= max_profit_pct.", chain_id));
+            }
+        }
+
+        Ok(config)
+    }
+
+    pub fn get_chain_config(&self, chain_id: &ChainId) -> Result<EthereumConfig> {
+        self.chains.get(chain_id).cloned().ok_or(anyhow!(
+            "Could not find chain id {} in the configuration",
+            &chain_id
+        ))
+    }
+}
+
+#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
+pub struct EthereumConfig {
+    /// URL of a Geth RPC endpoint to use for interacting with the blockchain.
+    /// TODO: Change type from String to Url
+    pub geth_rpc_addr: String,
+
+    /// URL of a Geth RPC wss endpoint to use for subscribing to blockchain events.
+    pub geth_rpc_wss: Option<String>,
+
+    /// Address of a Pyth Pulse contract to interact with.
+    pub contract_addr: Address,
+
+    /// Use the legacy transaction format (for networks without EIP 1559)
+    #[serde(default)]
+    pub legacy_tx: bool,
+
+    /// The gas limit to use for price update callback transactions.
+    pub gas_limit: u64,
+
+    /// The percentage multiplier to apply to priority fee estimates (100 = no change, e.g. 150 = 150% of base fee)
+    #[serde(default = "default_priority_fee_multiplier_pct")]
+    pub priority_fee_multiplier_pct: u64,
+
+    /// The escalation policy governs how the gas limit and fee are increased during backoff retries.
+    #[serde(default)]
+    pub escalation_policy: EscalationPolicyConfig,
+
+    /// The minimum percentage profit to earn as a function of the callback cost.
+    /// For example, 20 means a profit of 20% over the cost of a callback that uses the full gas limit.
+    /// The fee will be raised if the profit is less than this number.
+    /// The minimum value for this is -100. If set to < 0, it means the keeper may lose money on callbacks that use the full gas limit.
+    pub min_profit_pct: i64,
+
+    /// The target percentage profit to earn as a function of the callback cost.
+    /// For example, 20 means a profit of 20% over the cost of a callback that uses the full gas limit.
+    /// The fee will be set to this target whenever it falls outside the min/max bounds.
+    /// The minimum value for this is -100. If set to < 0, it means the keeper may lose money on callbacks that use the full gas limit.
+    pub target_profit_pct: i64,
+
+    /// The maximum percentage profit to earn as a function of the callback cost.
+    /// For example, 100 means a profit of 100% over the cost of a callback that uses the full gas limit.
+    /// The fee will be lowered if it is more profitable than specified here.
+    /// Must be larger than min_profit_pct.
+    /// The minimum value for this is -100. If set to < 0, it means the keeper may lose money on callbacks that use the full gas limit.
+    pub max_profit_pct: i64,
+
+    /// Minimum wallet balance for the keeper. If the balance falls below this level, the keeper will
+    /// withdraw fees from the contract to top up. This functionality requires the keeper to be the fee
+    /// manager for the provider.
+    #[serde(default)]
+    pub min_keeper_balance: u128,
+
+    /// How much the provider charges for a request on this chain.
+    #[serde(default)]
+    pub fee: u128,
+
+    /// Maximum number of hashes to record in a request.
+    /// This should be set according to the maximum gas limit the provider supports for callbacks.
+    pub max_num_hashes: Option<u32>,
+
+    /// A list of delays (in blocks) that indicates how many blocks should be delayed
+    /// before we process a block. For retry logic, we can process blocks multiple times
+    /// at each specified delay. For example: [5, 10, 20].
+    #[serde(default = "default_block_delays")]
+    pub block_delays: Vec<u64>,
+}
+
+fn default_block_delays() -> Vec<u64> {
+    vec![5]
+}
+
+fn default_priority_fee_multiplier_pct() -> u64 {
+    100
+}
+
+#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
+pub struct EscalationPolicyConfig {
+    // The keeper will perform the callback as long as the tx is within this percentage of the configured gas limit.
+    // Default value is 110, meaning a 10% tolerance over the configured value.
+    #[serde(default = "default_gas_limit_tolerance_pct")]
+    pub gas_limit_tolerance_pct: u64,
+
+    /// The initial gas multiplier to apply to the tx gas estimate
+    #[serde(default = "default_initial_gas_multiplier_pct")]
+    pub initial_gas_multiplier_pct: u64,
+
+    /// The gas multiplier to apply to the tx gas estimate during backoff retries.
+    /// The gas on each successive retry is multiplied by this value, with the maximum multiplier capped at `gas_multiplier_cap_pct`.
+    #[serde(default = "default_gas_multiplier_pct")]
+    pub gas_multiplier_pct: u64,
+    /// The maximum gas multiplier to apply to the tx gas estimate during backoff retries.
+    #[serde(default = "default_gas_multiplier_cap_pct")]
+    pub gas_multiplier_cap_pct: u64,
+
+    /// The fee multiplier to apply to the fee during backoff retries.
+    /// The initial fee is 100% of the estimate (which itself may be padded based on our chain configuration)
+    /// The fee on each successive retry is multiplied by this value, with the maximum multiplier capped at `fee_multiplier_cap_pct`.
+    #[serde(default = "default_fee_multiplier_pct")]
+    pub fee_multiplier_pct: u64,
+    #[serde(default = "default_fee_multiplier_cap_pct")]
+    pub fee_multiplier_cap_pct: u64,
+}
+
+fn default_gas_limit_tolerance_pct() -> u64 {
+    110
+}
+
+fn default_initial_gas_multiplier_pct() -> u64 {
+    125
+}
+
+fn default_gas_multiplier_pct() -> u64 {
+    110
+}
+
+fn default_gas_multiplier_cap_pct() -> u64 {
+    600
+}
+
+fn default_fee_multiplier_pct() -> u64 {
+    110
+}
+
+fn default_fee_multiplier_cap_pct() -> u64 {
+    200
+}
+
+impl Default for EscalationPolicyConfig {
+    fn default() -> Self {
+        Self {
+            gas_limit_tolerance_pct: default_gas_limit_tolerance_pct(),
+            initial_gas_multiplier_pct: default_initial_gas_multiplier_pct(),
+            gas_multiplier_pct: default_gas_multiplier_pct(),
+            gas_multiplier_cap_pct: default_gas_multiplier_cap_pct(),
+            fee_multiplier_pct: default_fee_multiplier_pct(),
+            fee_multiplier_cap_pct: default_fee_multiplier_cap_pct(),
+        }
+    }
+}
+
+impl EscalationPolicyConfig {
+    pub fn to_policy(&self) -> EscalationPolicy {
+        EscalationPolicy {
+            gas_limit_tolerance_pct: self.gas_limit_tolerance_pct,
+            initial_gas_multiplier_pct: self.initial_gas_multiplier_pct,
+            gas_multiplier_pct: self.gas_multiplier_pct,
+            gas_multiplier_cap_pct: self.gas_multiplier_cap_pct,
+            fee_multiplier_pct: self.fee_multiplier_pct,
+            fee_multiplier_cap_pct: self.fee_multiplier_cap_pct,
+        }
+    }
+}
+
+/// Configuration values that are common to a single provider (and shared across chains).
+#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
+pub struct ProviderConfig {
+    /// The URI where clients can retrieve price updates from this provider,
+    /// i.e., wherever Argus for this provider will be hosted.
+    pub uri: String,
+
+    /// The public key of the provider whose requests the server will respond to.
+    pub address: Address,
+
+    /// The provider's private key, which is required to register, update provider information,
+    /// or claim fees. This argument *will not* be loaded for commands that do not need
+    /// the private key (e.g., running the server).
+    pub private_key: SecretString,
+
+    /// The length of the hash chain to generate.
+    pub chain_length: u64,
+
+    /// How frequently the hash chain is sampled -- increase this value to tradeoff more
+    /// compute per request for less RAM use.
+    #[serde(default = "default_chain_sample_interval")]
+    pub chain_sample_interval: u64,
+
+    /// The address of the fee manager for the provider. Set this value to the keeper wallet address to
+    /// enable keeper balance top-ups.
+    pub fee_manager: Option<Address>,
+}
+
+fn default_chain_sample_interval() -> u64 {
+    1
+}
+
+/// Configuration values for the keeper service that are shared across chains.
+#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
+pub struct KeeperConfig {
+    /// If provided, the keeper will run alongside the Argus API service.
+    /// The private key is a 20-byte (40 char) hex encoded Ethereum private key.
+    /// This key is required to submit transactions for price update callback requests.
+    /// This key *does not need to be a registered provider*. In particular, production deployments
+    /// should ensure this is a different key in order to reduce the severity of security breaches.
+    pub private_key: SecretString,
+}
+
+// A secret is a string that can be provided either as a literal in the config,
+// or in a separate file. (The separate file option is useful for 1password mounting in production.)
+#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
+pub struct SecretString {
+    pub value: Option<String>,
+
+    // The name of a file containing the string to read. Note that the file contents is trimmed
+    // of leading/trailing whitespace when read.
+    pub file: Option<String>,
+}
+
+impl SecretString {
+    pub fn load(&self) -> Result<Option<String>> {
+        if let Some(v) = &self.value {
+            return Ok(Some(v.clone()));
+        }
+
+        if let Some(v) = &self.file {
+            return Ok(Some(fs::read_to_string(v)?.trim().to_string()));
+        }
+
+        Ok(None)
+    }
+}
diff --git a/apps/argus/src/config/generate.rs b/apps/argus/src/config/generate.rs
new file mode 100644
index 0000000000..198b15eee4
--- /dev/null
+++ b/apps/argus/src/config/generate.rs
@@ -0,0 +1,37 @@
+use {
+    crate::{api::ChainId, config::ConfigOptions},
+    clap::Args,
+    ethers::types::Address,
+    reqwest::Url,
+};
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Generate Options")]
+#[group(id = "Generate")]
+pub struct GenerateOptions {
+    #[command(flatten)]
+    pub config: ConfigOptions,
+
+    /// The chain on which to submit the random number generation request.
+    #[arg(long = "chain-id")]
+    #[arg(env = "FORTUNA_CHAIN_ID")]
+    pub chain_id: ChainId,
+
+    /// A 20-byte (40 char) hex encoded Ethereum private key.
+    /// This key is required to submit transactions (such as registering with the contract).
+    #[arg(long = "private-key")]
+    #[arg(env = "PRIVATE_KEY")]
+    #[arg(default_value = None)]
+    pub private_key: String,
+
+    /// Submit a randomness request to this provider
+    #[arg(long = "provider")]
+    pub provider: Address,
+
+    #[arg(long = "url")]
+    #[arg(default_value = super::DEFAULT_HTTP_ADDR)]
+    pub url: Url,
+
+    #[arg(short = 'b')]
+    pub blockhash: bool,
+}
diff --git a/apps/argus/src/config/get_request.rs b/apps/argus/src/config/get_request.rs
new file mode 100644
index 0000000000..9377ba369f
--- /dev/null
+++ b/apps/argus/src/config/get_request.rs
@@ -0,0 +1,29 @@
+use {
+    crate::{api::ChainId, config::ConfigOptions},
+    clap::Args,
+    ethers::types::Address,
+};
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Get Request Options")]
+#[group(id = "GetRequest")]
+pub struct GetRequestOptions {
+    #[command(flatten)]
+    pub config: ConfigOptions,
+
+    /// Retrieve a randomness request to this provider
+    #[arg(long = "chain-id")]
+    #[arg(env = "FORTUNA_CHAIN_ID")]
+    pub chain_id: ChainId,
+
+    /// Retrieve a randomness request to this provider
+    #[arg(long = "provider")]
+    #[arg(env = "FORTUNA_PROVIDER")]
+    pub provider: Address,
+
+    /// The sequence number of the request to retrieve
+    #[arg(long = "sequence")]
+    #[arg(env = "FORTUNA_SEQUENCE")]
+    #[arg(default_value = "0")]
+    pub sequence: u64,
+}
diff --git a/apps/argus/src/config/inspect.rs b/apps/argus/src/config/inspect.rs
new file mode 100644
index 0000000000..c38469da24
--- /dev/null
+++ b/apps/argus/src/config/inspect.rs
@@ -0,0 +1,24 @@
+use {
+    crate::{api::ChainId, config::ConfigOptions},
+    clap::Args,
+};
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Inspect Options")]
+#[group(id = "Inspect")]
+pub struct InspectOptions {
+    #[command(flatten)]
+    pub config: ConfigOptions,
+
+    /// Check the requests on this chain, or all chains if not specified.
+    #[arg(long = "chain-id")]
+    pub chain_id: Option<ChainId>,
+
+    /// The number of requests to inspect starting from the most recent request.
+    #[arg(long = "num-requests", default_value = "1000")]
+    pub num_requests: u64,
+
+    /// The number of calls to make in each batch when using multicall.
+    #[arg(long = "multicall-batch-size", default_value = "100")]
+    pub multicall_batch_size: u64,
+}
diff --git a/apps/argus/src/config/register_provider.rs b/apps/argus/src/config/register_provider.rs
new file mode 100644
index 0000000000..2d26ff5985
--- /dev/null
+++ b/apps/argus/src/config/register_provider.rs
@@ -0,0 +1,17 @@
+use {
+    crate::{api::ChainId, config::ConfigOptions},
+    clap::Args,
+};
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Register Provider Options")]
+#[group(id = "RegisterProvider")]
+pub struct RegisterProviderOptions {
+    #[command(flatten)]
+    pub config: ConfigOptions,
+
+    /// Register the provider on this chain
+    #[arg(long = "chain-id")]
+    #[arg(env = "FORTUNA_CHAIN_ID")]
+    pub chain_id: ChainId,
+}
diff --git a/apps/argus/src/config/request_price_update.rs b/apps/argus/src/config/request_price_update.rs
new file mode 100644
index 0000000000..7399571416
--- /dev/null
+++ b/apps/argus/src/config/request_price_update.rs
@@ -0,0 +1,41 @@
+use {
+    crate::{api::ChainId, config::ConfigOptions},
+    clap::Args,
+    ethers::types::Address,
+};
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Request Price Update Options")]
+#[group(id = "RequestPriceUpdate")]
+pub struct RequestPriceUpdateOptions {
+    #[command(flatten)]
+    pub config: ConfigOptions,
+
+    /// Request price updates on this blockchain.
+    #[arg(long = "chain-id")]
+    #[arg(env = "ARGUS_CHAIN_ID")]
+    pub chain_id: ChainId,
+
+    /// A 20-byte (40 char) hex encoded Ethereum private key.
+    /// This key is required to submit transactions (such as registering with the contract).
+    #[arg(long = "private-key")]
+    #[arg(env = "PRIVATE_KEY")]
+    pub private_key: String,
+
+    /// Submit a price update request to this provider
+    #[arg(long = "provider")]
+    #[arg(env = "ARGUS_PROVIDER")]
+    pub provider: Address,
+
+    /// Price IDs to update (comma-separated hex strings, e.g. "0x1234...5678,0xabcd...ef01")
+    #[arg(long = "price-ids")]
+    #[arg(env = "ARGUS_PRICE_IDS")]
+    #[arg(required = true)]
+    pub price_ids: String,
+
+    /// Callback gas limit for the price update request
+    #[arg(long = "callback-gas-limit")]
+    #[arg(env = "ARGUS_CALLBACK_GAS_LIMIT")]
+    #[arg(default_value = "500000")]
+    pub callback_gas_limit: u64,
+}
diff --git a/apps/argus/src/config/run.rs b/apps/argus/src/config/run.rs
new file mode 100644
index 0000000000..bfd1581dc6
--- /dev/null
+++ b/apps/argus/src/config/run.rs
@@ -0,0 +1,20 @@
+use {crate::config::ConfigOptions, clap::Args, std::net::SocketAddr};
+
+/// Run the webservice
+#[derive(Args, Clone, Debug)]
+pub struct RunOptions {
+    #[command(flatten)]
+    pub config: ConfigOptions,
+
+    /// Address and port the HTTP server will bind to.
+    #[arg(long = "rpc-listen-addr")]
+    #[arg(default_value = super::DEFAULT_RPC_ADDR)]
+    #[arg(env = "RPC_ADDR")]
+    pub addr: SocketAddr,
+
+    /// Base URL for the Hermes API
+    #[arg(long = "hermes-base-url")]
+    #[arg(default_value = super::DEFAULT_HERMES_BASE_URL)]
+    #[arg(env = "HERMES_BASE_URL")]
+    pub hermes_base_url: String,
+}
diff --git a/apps/argus/src/config/setup_provider.rs b/apps/argus/src/config/setup_provider.rs
new file mode 100644
index 0000000000..70683da21b
--- /dev/null
+++ b/apps/argus/src/config/setup_provider.rs
@@ -0,0 +1,9 @@
+use {crate::config::ConfigOptions, clap::Args};
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Setup Provider Options")]
+#[group(id = "SetupProviderOptions")]
+pub struct SetupProviderOptions {
+    #[command(flatten)]
+    pub config: ConfigOptions,
+}
diff --git a/apps/argus/src/config/withdraw_fees.rs b/apps/argus/src/config/withdraw_fees.rs
new file mode 100644
index 0000000000..1d708c9e82
--- /dev/null
+++ b/apps/argus/src/config/withdraw_fees.rs
@@ -0,0 +1,28 @@
+use {
+    crate::{api::ChainId, config::ConfigOptions},
+    clap::Args,
+};
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Withdraw Fees Options")]
+#[group(id = "Withdraw Fees")]
+pub struct WithdrawFeesOptions {
+    #[command(flatten)]
+    pub config: ConfigOptions,
+
+    /// Withdraw the fees on this chain, or all chains if not specified.
+    #[arg(long = "chain-id")]
+    pub chain_id: Option<ChainId>,
+
+    /// If provided, run the command using the keeper wallet. By default, the command uses the provider wallet.
+    /// If this option is provided, the keeper wallet must be configured and set as the fee manager for the provider.
+    #[arg(long = "keeper")]
+    #[arg(default_value = "false")]
+    pub keeper: bool,
+
+    /// If specified, only withdraw fees over the given balance from the contract.
+    /// If omitted, all accrued fees are withdrawn.
+    #[arg(long = "retain-balance")]
+    #[arg(default_value = "0")]
+    pub retain_balance_wei: u128,
+}
diff --git a/apps/argus/src/keeper.rs b/apps/argus/src/keeper.rs
new file mode 100644
index 0000000000..42a3520aa2
--- /dev/null
+++ b/apps/argus/src/keeper.rs
@@ -0,0 +1,228 @@
+use {
+    crate::{
+        api::{BlockchainState, ChainId},
+        chain::ethereum::{InstrumentedPythContract, InstrumentedSignablePythContract},
+        config::EthereumConfig,
+        keeper::request::{
+            get_latest_safe_block, process_active_requests,
+        },
+        keeper::fee::adjust_fee_wrapper,
+        keeper::fee::withdraw_fees_wrapper,
+        keeper::track::track_balance,
+        keeper::track::track_provider,
+    },
+    fortuna::eth_utils::traced_client::RpcMetrics,
+    ethers::{signers::Signer, types::U256},
+    keeper_metrics::{AccountLabel, KeeperMetrics},
+    std::{collections::HashSet, sync::Arc},
+    tokio::{
+        spawn,
+        sync::RwLock,
+        time::{self, Duration},
+    },
+    tracing::{self, Instrument},
+};
+
+pub(crate) mod request;
+pub(crate) mod fee;
+pub(crate) mod keeper_metrics;
+pub(crate) mod track;
+pub(crate) mod hermes;
+
+/// Track metrics in this interval
+const TRACK_INTERVAL: Duration = Duration::from_secs(10);
+/// Check whether we need to conduct a withdrawal at this interval.
+const WITHDRAW_INTERVAL: Duration = Duration::from_secs(300);
+/// Check whether we need to adjust the fee at this interval.
+const ADJUST_FEE_INTERVAL: Duration = Duration::from_secs(30);
+/// Check for active requests at this interval
+const ACTIVE_REQUESTS_INTERVAL: Duration = Duration::from_secs(2);
+/// Maximum number of active requests to process in a single batch
+const MAX_ACTIVE_REQUESTS: usize = 100;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum RequestState {
+    /// Fulfilled means that the request was either revealed or we are sure we
+    /// will not be able to reveal it.
+    Fulfilled,
+    /// We have already processed the request but couldn't fulfill it and we are
+    /// unsure if we can fulfill it or not.
+    Processed,
+}
+
+/// Run threads to handle active requests, periodically check for new requests,
+/// and manage fees and balance.
+#[tracing::instrument(name = "keeper", skip_all, fields(chain_id = chain_state.id))]
+pub async fn run_keeper_threads(
+    private_key: String,
+    chain_eth_config: EthereumConfig,
+    chain_state: BlockchainState,
+    metrics: Arc<KeeperMetrics>,
+    rpc_metrics: Arc<RpcMetrics>,
+    hermes_base_url: String,
+) {
+    tracing::info!("starting keeper");
+    let latest_safe_block = get_latest_safe_block(&chain_state).in_current_span().await;
+    tracing::info!("latest safe block: {}", &latest_safe_block);
+
+    let contract = Arc::new(
+        InstrumentedSignablePythContract::from_config(
+            &chain_eth_config,
+            &private_key,
+            chain_state.id.clone(),
+            rpc_metrics.clone(),
+        )
+        .await
+        .expect("Chain config should be valid"),
+    );
+    let keeper_address = contract.wallet().address();
+
+    let fulfilled_requests_cache = Arc::new(RwLock::new(HashSet::<u64>::new()));
+
+    // Spawn a thread to handle active requests initially
+    let gas_limit: U256 = chain_eth_config.gas_limit.into();
+    spawn(
+        process_active_requests(
+            MAX_ACTIVE_REQUESTS,
+            contract.clone(),
+            gas_limit,
+            chain_eth_config.escalation_policy.to_policy(),
+            chain_state.clone(),
+            metrics.clone(),
+            fulfilled_requests_cache.clone(),
+            hermes_base_url.clone(),
+        )
+        .in_current_span(),
+    );
+
+    // Clone values needed for the periodic request checking thread
+    let request_check_contract = contract.clone();
+    let request_check_chain_state = chain_state.clone();
+    let request_check_metrics = metrics.clone();
+    let request_check_escalation_policy = chain_eth_config.escalation_policy.to_policy();
+    let request_check_fulfilled_requests_cache = fulfilled_requests_cache.clone();
+    let request_check_hermes_base_url = hermes_base_url.clone();
+
+    // Spawn a thread to periodically check for active requests
+    spawn(
+        async move {
+            loop {
+                time::sleep(ACTIVE_REQUESTS_INTERVAL).await;
+
+                process_active_requests(
+                    MAX_ACTIVE_REQUESTS,
+                    request_check_contract.clone(),
+                    gas_limit,
+                    request_check_escalation_policy.clone(),
+                    request_check_chain_state.clone(),
+                    request_check_metrics.clone(),
+                    request_check_fulfilled_requests_cache.clone(),
+                    request_check_hermes_base_url.clone(),
+                )
+                .in_current_span()
+                .await;
+            }
+        }
+        .in_current_span(),
+    );
+
+    // Spawn a thread that watches the keeper wallet balance and submits withdrawal transactions as needed to top-up the balance.
+    spawn(
+        withdraw_fees_wrapper(
+            contract.clone(),
+            chain_state.provider_address,
+            WITHDRAW_INTERVAL,
+            U256::from(chain_eth_config.min_keeper_balance),
+        )
+        .in_current_span(),
+    );
+
+    // Clone values needed for the fee adjustment thread
+    let fee_adjust_contract = contract.clone();
+    let fee_adjust_chain_state = chain_state.clone();
+    let fee_adjust_metrics = metrics.clone();
+
+    // Spawn a thread that periodically adjusts the provider fee.
+    spawn(
+        adjust_fee_wrapper(
+            fee_adjust_contract,
+            fee_adjust_chain_state.clone(),
+            fee_adjust_chain_state.provider_address,
+            ADJUST_FEE_INTERVAL,
+            chain_eth_config.legacy_tx,
+            // NOTE: we are adjusting the fees based on the maximum configured gas for user transactions.
+            // However, the keeper will pad the gas limit for transactions (per the escalation policy) to ensure reliable submission.
+            // Consequently, fees can be adjusted such that transactions are still unprofitable.
+            // While we could scale up this value based on the padding, that ends up overcharging users as most transactions cost nowhere
+            // near the maximum gas limit.
+            // In the unlikely event that the keeper fees aren't sufficient, the solution to this is to configure the target
+            // fee percentage to be higher on that specific chain.
+            chain_eth_config.gas_limit,
+            // NOTE: unwrap() here so we panic early if someone configures these values below -100.
+            u64::try_from(100 + chain_eth_config.min_profit_pct)
+                .expect("min_profit_pct must be >= -100"),
+            u64::try_from(100 + chain_eth_config.target_profit_pct)
+                .expect("target_profit_pct must be >= -100"),
+            u64::try_from(100 + chain_eth_config.max_profit_pct)
+                .expect("max_profit_pct must be >= -100"),
+            chain_eth_config.fee,
+            fee_adjust_metrics,
+        )
+        .in_current_span(),
+    );
+
+    // Clone values needed for the tracking thread
+    let track_chain_id = chain_state.id.clone();
+    let track_chain_config = chain_eth_config.clone();
+    let track_provider_address = chain_state.provider_address;
+    let track_keeper_metrics = metrics.clone();
+    let track_rpc_metrics = rpc_metrics.clone();
+
+    // Spawn a thread to track the provider info and the balance of the keeper
+    spawn(
+        async move {
+            let chain_id = track_chain_id;
+            let chain_config = track_chain_config;
+            let provider_address = track_provider_address;
+            let keeper_metrics = track_keeper_metrics;
+            let contract = match InstrumentedPythContract::from_config(
+                &chain_config,
+                chain_id.clone(),
+                track_rpc_metrics,
+            ) {
+                Ok(r) => r,
+                Err(e) => {
+                    tracing::error!("Error while connecting to pythnet contract. error: {:?}", e);
+                    return;
+                }
+            };
+
+            loop {
+                // There isn't a loop for indefinite trials. There is a new thread being spawned every `TRACK_INTERVAL` seconds.
+                // If rpc start fails all of these threads will just exit, instead of retrying.
+                // We are tracking rpc failures elsewhere, so it's fine.
+                spawn(
+                    track_provider(
+                        chain_id.clone(),
+                        contract.clone(),
+                        provider_address,
+                        keeper_metrics.clone(),
+                    )
+                    .in_current_span(),
+                );
+                spawn(
+                    track_balance(
+                        chain_id.clone(),
+                        contract.client(),
+                        keeper_address,
+                        keeper_metrics.clone(),
+                    )
+                    .in_current_span(),
+                );
+
+                time::sleep(TRACK_INTERVAL).await;
+            }
+        }
+        .in_current_span(),
+    );
+}
diff --git a/apps/argus/src/keeper/fee.rs b/apps/argus/src/keeper/fee.rs
new file mode 100644
index 0000000000..c5d683f35b
--- /dev/null
+++ b/apps/argus/src/keeper/fee.rs
@@ -0,0 +1,255 @@
+use {
+    crate::{
+        api::BlockchainState, chain::ethereum::InstrumentedSignablePythContract,
+        keeper::AccountLabel, keeper::ChainId, keeper::KeeperMetrics,
+    },
+    anyhow::{anyhow, Result},
+    ethers::{
+        middleware::Middleware,
+        signers::Signer,
+        types::{Address, U256},
+    },
+    fortuna::eth_utils::utils::{estimate_tx_cost, send_and_confirm},
+    std::sync::Arc,
+    tokio::time::{self, Duration},
+    tracing::{self, Instrument},
+};
+
+#[tracing::instrument(name = "withdraw_fees", skip_all, fields())]
+pub async fn withdraw_fees_wrapper(
+    contract: Arc<InstrumentedSignablePythContract>,
+    provider_address: Address,
+    poll_interval: Duration,
+    min_balance: U256,
+) {
+    loop {
+        if let Err(e) = withdraw_fees_if_necessary(contract.clone(), provider_address, min_balance)
+            .in_current_span()
+            .await
+        {
+            tracing::error!("Withdrawing fees. error: {:?}", e);
+        }
+        time::sleep(poll_interval).await;
+    }
+}
+
+/// Withdraws accumulated fees in the contract as needed to maintain the balance of the keeper wallet.
+pub async fn withdraw_fees_if_necessary(
+    contract: Arc<InstrumentedSignablePythContract>,
+    provider_address: Address,
+    min_balance: U256,
+) -> Result<()> {
+    let provider = contract.provider();
+    let wallet = contract.wallet();
+
+    let keeper_balance = provider
+        .get_balance(wallet.address(), None)
+        .await
+        .map_err(|e| anyhow!("Error while getting balance. error: {:?}", e))?;
+
+    let provider_info = contract
+        .get_provider_info(provider_address)
+        .call()
+        .await
+        .map_err(|e| anyhow!("Error while getting provider info. error: {:?}", e))?;
+
+    if provider_info.fee_manager != wallet.address() {
+        return Err(anyhow!("Fee manager for provider {:?} is not the keeper wallet. Fee manager: {:?} Keeper: {:?}", provider, provider_info.fee_manager, wallet.address()));
+    }
+
+    let fees = provider_info.accrued_fees_in_wei;
+
+    if keeper_balance < min_balance && U256::from(fees) > min_balance {
+        tracing::info!("Claiming accrued fees...");
+        let contract_call = contract.withdraw_as_fee_manager(provider_address, fees);
+        send_and_confirm(contract_call).await?;
+    } else if keeper_balance < min_balance {
+        tracing::warn!("Keeper balance {:?} is too low (< {:?}) but provider fees are not sufficient to top-up.", keeper_balance, min_balance)
+    }
+
+    Ok(())
+}
+
+#[tracing::instrument(name = "adjust_fee", skip_all)]
+#[allow(clippy::too_many_arguments)]
+pub async fn adjust_fee_wrapper(
+    contract: Arc<InstrumentedSignablePythContract>,
+    chain_state: BlockchainState,
+    provider_address: Address,
+    poll_interval: Duration,
+    legacy_tx: bool,
+    gas_limit: u64,
+    min_profit_pct: u64,
+    target_profit_pct: u64,
+    max_profit_pct: u64,
+    min_fee_wei: u128,
+    metrics: Arc<KeeperMetrics>,
+) {
+    // The maximum balance of accrued fees + provider wallet balance. None if we haven't observed a value yet.
+    let mut high_water_pnl: Option<U256> = None;
+    // Track when we last updated the fee
+    let mut last_fee_update_time: Option<u64> = None;
+    loop {
+        if let Err(e) = adjust_fee_if_necessary(
+            contract.clone(),
+            chain_state.id.clone(),
+            provider_address,
+            legacy_tx,
+            gas_limit,
+            min_profit_pct,
+            target_profit_pct,
+            max_profit_pct,
+            min_fee_wei,
+            &mut high_water_pnl,
+            &mut last_fee_update_time,
+            metrics.clone(),
+        )
+        .in_current_span()
+        .await
+        {
+            tracing::error!("Adjusting fees. error: {:?}", e);
+        }
+        time::sleep(poll_interval).await;
+    }
+}
+
+/// Adjust the fee charged by the provider to ensure that it is profitable at the prevailing gas price.
+/// This method targets a fee as a function of the maximum cost of the callback,
+/// c = (gas_limit) * (current gas price), with min_fee_wei as a lower bound on the fee.
+///
+/// The method then updates the on-chain fee if all of the following are satisfied:
+/// - the on-chain fee does not fall into an interval [c*min_profit, c*max_profit]. The tolerance
+///   factor prevents the on-chain fee from changing with every single gas price fluctuation.
+///   Profit scalars are specified in percentage units, min_profit = (min_profit_pct + 100) / 100
+/// - either the fee is increasing or the keeper is earning a profit -- i.e., fees only decrease when the keeper is profitable
+/// - at least some time has passed since the last fee update
+///
+/// These conditions are intended to make sure that the keeper is profitable while also minimizing the number of fee
+/// update transactions.
+#[allow(clippy::too_many_arguments)]
+pub async fn adjust_fee_if_necessary(
+    contract: Arc<InstrumentedSignablePythContract>,
+    chain_id: ChainId,
+    provider_address: Address,
+    legacy_tx: bool,
+    gas_limit: u64,
+    min_profit_pct: u64,
+    target_profit_pct: u64,
+    max_profit_pct: u64,
+    min_fee_wei: u128,
+    high_water_pnl: &mut Option<U256>,
+    last_fee_update_time: &mut Option<u64>,
+    metrics: Arc<KeeperMetrics>,
+) -> Result<()> {
+    let provider_info = contract
+        .get_provider_info(provider_address)
+        .call()
+        .await
+        .map_err(|e| anyhow!("Error while getting provider info. error: {:?}", e))?;
+
+    if provider_info.fee_manager != contract.wallet().address() {
+        return Err(anyhow!("Fee manager for provider {:?} is not the keeper wallet. Fee manager: {:?} Keeper: {:?}", contract.provider(), provider_info.fee_manager, contract.wallet().address()));
+    }
+
+    // Calculate target window for the on-chain fee.
+    let middleware = contract.client();
+    let max_callback_cost: u128 = estimate_tx_cost(middleware, legacy_tx, gas_limit.into())
+        .await
+        .map_err(|e| anyhow!("Could not estimate transaction cost. error {:?}", e))?;
+
+    let account_label = AccountLabel {
+        chain_id: chain_id.clone(),
+        address: provider_address.to_string(),
+    };
+
+    metrics
+        .gas_price_estimate
+        .get_or_create(&account_label)
+        .set((max_callback_cost / u128::from(gas_limit)) as f64 / 1e9);
+
+    let target_fee_min = std::cmp::max(
+        (max_callback_cost * u128::from(min_profit_pct)) / 100,
+        min_fee_wei,
+    );
+    let target_fee = std::cmp::max(
+        (max_callback_cost * u128::from(target_profit_pct)) / 100,
+        min_fee_wei,
+    );
+    metrics
+        .target_provider_fee
+        .get_or_create(&account_label)
+        .set(((max_callback_cost * u128::from(target_profit_pct)) / 100) as f64 / 1e18);
+
+    let target_fee_max = std::cmp::max(
+        (max_callback_cost * u128::from(max_profit_pct)) / 100,
+        min_fee_wei,
+    );
+
+    // Calculate current P&L to determine if we can reduce fees.
+    let current_keeper_balance = contract
+        .provider()
+        .get_balance(contract.wallet().address(), None)
+        .await
+        .map_err(|e| anyhow!("Error while getting balance. error: {:?}", e))?;
+    let current_keeper_fees = U256::from(provider_info.accrued_fees_in_wei);
+    let current_pnl = current_keeper_balance + current_keeper_fees;
+
+    let can_reduce_fees = match high_water_pnl {
+        Some(x) => current_pnl >= *x,
+        None => false,
+    };
+
+    // Get current timestamp to determine if enough time has passed since last update
+    let current_time = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap_or_default()
+        .as_secs();
+
+    // Determine if enough time has passed since the last fee update
+    // We'll use a 10-minute minimum interval between fee updates
+    const MIN_FEE_UPDATE_INTERVAL: u64 = 600; // 10 minutes
+    let is_update_time = match last_fee_update_time {
+        Some(last_time) => current_time.saturating_sub(*last_time) >= MIN_FEE_UPDATE_INTERVAL,
+        None => true, // First run, allow update
+    };
+
+    let provider_fee: u128 = provider_info.fee_in_wei;
+    if is_update_time
+        && ((provider_fee > target_fee_max && can_reduce_fees) || provider_fee < target_fee_min)
+    {
+        tracing::info!(
+            "Adjusting fees. Current: {:?} Target: {:?}",
+            provider_fee,
+            target_fee
+        );
+        let contract_call = contract.set_provider_fee(target_fee);
+        send_and_confirm(contract_call).await?;
+
+        *last_fee_update_time = Some(current_time);
+    } else {
+        tracing::info!(
+            "Skipping fee adjustment. Current: {:?} Target: {:?} [{:?}, {:?}] Last update time: {:?} Current time: {:?} Current pnl: {:?} High water pnl: {:?}",
+            provider_fee,
+            target_fee,
+            target_fee_min,
+            target_fee_max,
+            last_fee_update_time,
+            current_time,
+            current_pnl,
+            high_water_pnl
+        )
+    }
+
+    // Update high water pnl
+    *high_water_pnl = Some(std::cmp::max(
+        current_pnl,
+        high_water_pnl.unwrap_or(U256::from(0)),
+    ));
+
+    // Initialize last_fee_update_time on first run
+    if last_fee_update_time.is_none() {
+        *last_fee_update_time = Some(current_time);
+    }
+
+    Ok(())
+}
diff --git a/apps/argus/src/keeper/hermes.rs b/apps/argus/src/keeper/hermes.rs
new file mode 100644
index 0000000000..4d38d2d9f1
--- /dev/null
+++ b/apps/argus/src/keeper/hermes.rs
@@ -0,0 +1,413 @@
+/// Hermes Integration
+///
+/// This module provides integration with the Hermes API for fetching price updates to fulfill Pulse requests.
+///
+/// # Overview
+///
+/// The Hermes API is used to fetch price updates for specific price IDs at a given publish time.
+/// These updates are then used to execute callbacks on the Pulse contract.
+///
+/// # API Endpoints
+///
+/// The main endpoint used is:
+///
+/// GET /v2/updates/price/{publish_time}
+///
+/// This endpoint returns price updates for the specified price IDs at the given publish time.
+///
+/// ## Parameters
+///
+/// - `publish_time`: The timestamp for which to fetch price updates
+/// - `ids`: Comma-separated list of price IDs (hex-encoded)
+///
+/// ## Response
+///
+/// The response contains binary data that can be passed directly to the `executeCallback` function on the Pulse contract:
+///
+/// {
+///   "binary": {
+///     "data": ["0x..."],
+///     "encoding": "hex"
+///   }
+/// }
+///
+use {
+    anyhow::{anyhow, Result},
+    ethers::types::Bytes,
+    reqwest::Client,
+    serde::{Deserialize, Serialize},
+    std::time::Duration,
+    tracing,
+};
+
+const HERMES_TIMEOUT: Duration = Duration::from_secs(10);
+const DEFAULT_HERMES_BASE_URL: &str = "https://hermes.pyth.network";
+
+/// Binary data response from Hermes API
+#[derive(Debug, Serialize, Deserialize)]
+pub struct BinaryData {
+    pub data: Vec<String>,
+    pub encoding: String,
+}
+
+/// Response from Hermes API for price updates
+#[derive(Debug, Serialize, Deserialize)]
+pub struct HermesResponse {
+    pub binary: BinaryData,
+}
+
+/// Client for interacting with the Hermes API
+///
+/// This client provides a simple interface for fetching price updates from the Hermes API.
+/// It handles:
+///
+/// - Converting price IDs to the correct format
+/// - Making HTTP requests to the Hermes API
+/// - Parsing the response and converting it to the format expected by the Pulse contract
+/// - Error handling and retries
+pub struct HermesClient {
+    client: Client,
+    base_url: String,
+}
+
+impl HermesClient {
+    /// Create a new Hermes client with default configuration
+    pub fn new() -> Self {
+        // Use the default base URL
+        Self::with_base_url(DEFAULT_HERMES_BASE_URL.to_string())
+    }
+
+    /// Create a new Hermes client with a custom base URL
+    pub fn with_base_url(base_url: String) -> Self {
+        let client = Client::builder()
+            .timeout(HERMES_TIMEOUT)
+            .build()
+            .expect("Failed to build HTTP client");
+
+        Self { client, base_url }
+    }
+
+    /// Fetch price updates for the given price IDs at the specified publish time
+    ///
+    /// Returns the binary update data that can be passed to the executeCallback function
+    pub async fn get_price_updates(
+        &self,
+        publish_time: u64,
+        price_ids: &[[u8; 32]],
+    ) -> Result<Vec<Bytes>> {
+        let price_ids_hex: Vec<String> = price_ids
+            .iter()
+            .map(|id| format!("0x{}", hex::encode(id)))
+            .collect();
+
+        let url = format!("{}/v2/updates/price/{}", self.base_url, publish_time);
+        tracing::debug!(
+            "Fetching price updates from Hermes for publish_time={} price_ids={:?}",
+            publish_time,
+            price_ids_hex
+        );
+
+        let mut query_params = Vec::new();
+        for id in &price_ids_hex {
+            query_params.push(("ids[]", id.as_str()));
+        }
+
+        let response = self.client.get(&url).query(&query_params).send().await?;
+        println!("Full URL: {}", response.url());
+
+        if !response.status().is_success() {
+            let status = response.status();
+            let text = response.text().await?;
+            return Err(anyhow!(
+                "Failed to fetch price updates: status={}, body={}",
+                status,
+                text
+            ));
+        }
+
+        let hermes_response: HermesResponse = response.json().await?;
+
+        // Convert hex-encoded strings to bytes
+        let update_data = hermes_response
+            .binary
+            .data
+            .into_iter()
+            .map(|hex_str| {
+                let hex_str = hex_str.trim_start_matches("0x");
+                let bytes = hex::decode(hex_str)
+                    .map_err(|e| anyhow!("Failed to decode hex string: {}", e))?;
+                Ok(Bytes::from(bytes))
+            })
+            .collect::<Result<Vec<Bytes>>>()?;
+
+        tracing::debug!(
+            "Received {} update data entries from Hermes",
+            update_data.len()
+        );
+
+        Ok(update_data)
+    }
+}
+
+impl Default for HermesClient {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Fetch price updates from Hermes for the given price IDs at the specified publish time
+///
+/// This function handles retries and error handling for Hermes API requests
+#[tracing::instrument(skip_all, fields(publish_time))]
+pub async fn fetch_price_updates_from_hermes(
+    publish_time: u64,
+    price_ids: &[[u8; 32]],
+    hermes_base_url: String,
+) -> Result<Vec<Bytes>> {
+    const MAX_RETRIES: usize = 3;
+    const RETRY_DELAY: std::time::Duration = std::time::Duration::from_millis(500);
+
+    // Create a client with the provided base URL
+    let hermes_client = HermesClient::with_base_url(hermes_base_url);
+
+    let mut last_error = None;
+
+    for retry in 0..MAX_RETRIES {
+        match hermes_client
+            .get_price_updates(publish_time, price_ids)
+            .await
+        {
+            Ok(update_data) => {
+                if update_data.is_empty() {
+                    tracing::warn!(
+                        "Hermes returned empty update data for publish_time={}",
+                        publish_time
+                    );
+                    return Err(anyhow!("Hermes returned empty update data"));
+                }
+
+                tracing::info!(
+                    "Successfully fetched price updates from Hermes: {} entries",
+                    update_data.len()
+                );
+                return Ok(update_data);
+            }
+            Err(e) => {
+                last_error = Some(e);
+                if retry < MAX_RETRIES - 1 {
+                    tracing::warn!(
+                        "Failed to fetch price updates from Hermes (retry {}/{}): {:?}",
+                        retry + 1,
+                        MAX_RETRIES,
+                        last_error
+                    );
+                    tokio::time::sleep(RETRY_DELAY).await;
+                }
+            }
+        }
+    }
+
+    Err(anyhow!(
+        "Failed to fetch price updates from Hermes after {} retries: {:?}",
+        MAX_RETRIES,
+        last_error
+    ))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use mockito::{self, Matcher};
+
+    #[tokio::test]
+    async fn test_get_price_updates_success() {
+        // Setup mock server
+        let mut mock_server = mockito::Server::new_async().await;
+        let url = mock_server.url();
+
+        // Create a test price ID
+        let price_id = [
+            0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab,
+            0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78,
+            0x90, 0xab, 0xcd, 0xef,
+        ];
+
+        // Create a mock for the Hermes API endpoint
+        let mock = mock_server
+            .mock("GET", "/v2/updates/price/1234567890")
+            .match_query(Matcher::UrlEncoded(
+                "ids".into(),
+                "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef".into(),
+            ))
+            .with_status(200)
+            .with_header("content-type", "application/json")
+            .with_body(
+                r#"{
+                "binary": {
+                    "data": ["0xabcdef1234567890", "0x123456"],
+                    "encoding": "hex"
+                }
+            }"#,
+            )
+            .create_async()
+            .await;
+
+        // Create a client with the mock server URL
+        let client = HermesClient::with_base_url(url);
+
+        // Call the method
+        let result = client.get_price_updates(1234567890, &[price_id]).await;
+
+        // Verify the result
+        assert!(result.is_ok());
+        let updates = result.unwrap();
+        assert_eq!(updates.len(), 2);
+
+        // Check the first update data
+        let expected_data1 = hex::decode("abcdef1234567890").unwrap();
+        assert_eq!(updates[0].to_vec(), expected_data1);
+
+        // Check the second update data
+        let expected_data2 = hex::decode("123456").unwrap();
+        assert_eq!(updates[1].to_vec(), expected_data2);
+
+        // Verify the mock was called
+        mock.assert_async().await;
+    }
+
+    #[tokio::test]
+    async fn test_get_price_updates_error_response() {
+        // Setup mock server
+        let mut mock_server = mockito::Server::new_async().await;
+        let url = mock_server.url();
+
+        // Create a test price ID
+        let price_id = [
+            0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab,
+            0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78,
+            0x90, 0xab, 0xcd, 0xef,
+        ];
+
+        // Create a mock for the Hermes API endpoint with an error response
+        let mock = mock_server
+            .mock("GET", "/v2/updates/price/1234567890")
+            .match_query(Matcher::UrlEncoded(
+                "ids".into(),
+                "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef".into(),
+            ))
+            .with_status(404)
+            .with_body("Not found")
+            .create_async()
+            .await;
+
+        // Create a client with the mock server URL
+        let client = HermesClient::with_base_url(url);
+
+        // Call the method
+        let result = client.get_price_updates(1234567890, &[price_id]).await;
+
+        // Verify the result is an error
+        assert!(result.is_err());
+        let error = result.unwrap_err();
+        assert!(error.to_string().contains("Failed to fetch price updates"));
+
+        // Verify the mock was called
+        mock.assert_async().await;
+    }
+
+    #[tokio::test]
+    async fn test_get_price_updates_empty_response() {
+        // Setup mock server
+        let mut mock_server = mockito::Server::new_async().await;
+        let url = mock_server.url();
+
+        // Create a test price ID
+        let price_id = [
+            0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab,
+            0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78,
+            0x90, 0xab, 0xcd, 0xef,
+        ];
+
+        // Create a mock for the Hermes API endpoint with an empty data array
+        let mock = mock_server
+            .mock("GET", "/v2/updates/price/1234567890")
+            .match_query(Matcher::UrlEncoded(
+                "ids".into(),
+                "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef".into(),
+            ))
+            .with_status(200)
+            .with_header("content-type", "application/json")
+            .with_body(
+                r#"{
+                "binary": {
+                    "data": [],
+                    "encoding": "hex"
+                }
+            }"#,
+            )
+            .create_async()
+            .await;
+
+        // Create a client with the mock server URL
+        let client = HermesClient::with_base_url(url);
+
+        // Call the method
+        let result = client.get_price_updates(1234567890, &[price_id]).await;
+
+        // Verify the result
+        assert!(result.is_ok());
+        let updates = result.unwrap();
+        assert_eq!(updates.len(), 0);
+
+        // Verify the mock was called
+        mock.assert_async().await;
+    }
+
+    #[tokio::test]
+    async fn test_get_price_updates_invalid_hex() {
+        // Setup mock server
+        let mut mock_server = mockito::Server::new_async().await;
+        let url = mock_server.url();
+
+        // Create a test price ID
+        let price_id = [
+            0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab,
+            0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78,
+            0x90, 0xab, 0xcd, 0xef,
+        ];
+
+        // Create a mock for the Hermes API endpoint with invalid hex data
+        let mock = mock_server
+            .mock("GET", "/v2/updates/price/1234567890")
+            .match_query(Matcher::UrlEncoded(
+                "ids".into(),
+                "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef".into(),
+            ))
+            .with_status(200)
+            .with_header("content-type", "application/json")
+            .with_body(
+                r#"{
+                "binary": {
+                    "data": ["0xZZZZ"],
+                    "encoding": "hex"
+                }
+            }"#,
+            )
+            .create_async()
+            .await;
+
+        // Create a client with the mock server URL
+        let client = HermesClient::with_base_url(url);
+
+        // Call the method
+        let result = client.get_price_updates(1234567890, &[price_id]).await;
+
+        // Verify the result is an error about invalid hex
+        assert!(result.is_err());
+        let error = result.unwrap_err();
+        assert!(error.to_string().contains("Failed to decode hex string"));
+
+        // Verify the mock was called
+        mock.assert_async().await;
+    }
+}
diff --git a/apps/argus/src/keeper/keeper_metrics.rs b/apps/argus/src/keeper/keeper_metrics.rs
new file mode 100644
index 0000000000..769b6f4b67
--- /dev/null
+++ b/apps/argus/src/keeper/keeper_metrics.rs
@@ -0,0 +1,240 @@
+use {
+    ethers::types::Address,
+    prometheus_client::{
+        encoding::EncodeLabelSet,
+        metrics::{counter::Counter, family::Family, gauge::Gauge, histogram::Histogram},
+        registry::Registry,
+    },
+    std::sync::atomic::AtomicU64,
+    std::sync::Arc,
+    tokio::sync::RwLock,
+};
+
+#[derive(Clone, Debug, Hash, PartialEq, Eq, EncodeLabelSet)]
+pub struct AccountLabel {
+    pub chain_id: String,
+    pub address: String,
+}
+
+pub struct KeeperMetrics {
+    pub balance: Family<AccountLabel, Gauge<f64, AtomicU64>>,
+    pub collected_fee: Family<AccountLabel, Gauge<f64, AtomicU64>>,
+    pub current_fee: Family<AccountLabel, Gauge<f64, AtomicU64>>,
+    pub target_provider_fee: Family<AccountLabel, Gauge<f64, AtomicU64>>,
+    pub total_gas_spent: Family<AccountLabel, Gauge<f64, AtomicU64>>,
+    pub total_gas_fee_spent: Family<AccountLabel, Gauge<f64, AtomicU64>>,
+    pub requests: Family<AccountLabel, Counter>,
+    pub requests_processed: Family<AccountLabel, Counter>,
+    pub requests_processed_success: Family<AccountLabel, Counter>,
+    pub requests_processed_failure: Family<AccountLabel, Counter>,
+    pub requests_reprocessed: Family<AccountLabel, Counter>,
+    pub callbacks_executed: Family<AccountLabel, Counter>,
+    pub request_duration_ms: Family<AccountLabel, Histogram>,
+    pub retry_count: Family<AccountLabel, Histogram>,
+    pub final_gas_multiplier: Family<AccountLabel, Histogram>,
+    pub final_fee_multiplier: Family<AccountLabel, Histogram>,
+    pub gas_price_estimate: Family<AccountLabel, Gauge<f64, AtomicU64>>,
+}
+
+impl Default for KeeperMetrics {
+    fn default() -> Self {
+        Self {
+            balance: Family::default(),
+            collected_fee: Family::default(),
+            current_fee: Family::default(),
+            target_provider_fee: Family::default(),
+            total_gas_spent: Family::default(),
+            total_gas_fee_spent: Family::default(),
+            requests: Family::default(),
+            requests_processed: Family::default(),
+            requests_processed_success: Family::default(),
+            requests_processed_failure: Family::default(),
+            requests_reprocessed: Family::default(),
+            callbacks_executed: Family::default(),
+            request_duration_ms: Family::new_with_constructor(|| {
+                Histogram::new(
+                    vec![
+                        1000.0, 2500.0, 5000.0, 7500.0, 10000.0, 20000.0, 30000.0, 40000.0,
+                        50000.0, 60000.0, 120000.0, 180000.0, 240000.0, 300000.0, 600000.0,
+                    ]
+                    .into_iter(),
+                )
+            }),
+            retry_count: Family::new_with_constructor(|| {
+                Histogram::new(vec![0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 10.0, 15.0, 20.0].into_iter())
+            }),
+            final_gas_multiplier: Family::new_with_constructor(|| {
+                Histogram::new(
+                    vec![100.0, 125.0, 150.0, 200.0, 300.0, 400.0, 500.0, 600.0].into_iter(),
+                )
+            }),
+            final_fee_multiplier: Family::new_with_constructor(|| {
+                Histogram::new(vec![100.0, 110.0, 120.0, 140.0, 160.0, 180.0, 200.0].into_iter())
+            }),
+            gas_price_estimate: Family::default(),
+        }
+    }
+}
+
+impl KeeperMetrics {
+    pub async fn new(
+        registry: Arc<RwLock<Registry>>,
+        chain_labels: Vec<(String, Address)>,
+    ) -> Self {
+        let mut writable_registry = registry.write().await;
+        let keeper_metrics = KeeperMetrics::default();
+
+
+        writable_registry.register(
+            "requests",
+            "Number of price update requests received through events",
+            keeper_metrics.requests.clone(),
+        );
+
+        writable_registry.register(
+            "requests_processed",
+            "Number of price update requests processed",
+            keeper_metrics.requests_processed.clone(),
+        );
+
+        writable_registry.register(
+            "requests_processed_success",
+            "Number of price update requests processed successfully",
+            keeper_metrics.requests_processed_success.clone(),
+        );
+
+        writable_registry.register(
+            "requests_processed_failure",
+            "Number of price update requests processed with failure",
+            keeper_metrics.requests_processed_failure.clone(),
+        );
+
+        writable_registry.register(
+            "callbacks_executed",
+            "Number of price update callbacks executed",
+            keeper_metrics.callbacks_executed.clone(),
+        );
+
+        writable_registry.register(
+            "balance",
+            "Balance of the keeper",
+            keeper_metrics.balance.clone(),
+        );
+
+        writable_registry.register(
+            "collected_fee",
+            "Collected fee on the contract",
+            keeper_metrics.collected_fee.clone(),
+        );
+
+        writable_registry.register(
+            "current_fee",
+            "Current fee charged by the provider",
+            keeper_metrics.current_fee.clone(),
+        );
+
+        writable_registry.register(
+            "target_provider_fee",
+            "Target fee in ETH -- differs from current_fee in that this is the goal, and current_fee is the on-chain value.",
+            keeper_metrics.target_provider_fee.clone(),
+        );
+
+        writable_registry.register(
+            "total_gas_spent",
+            "Total gas spent executing callbacks",
+            keeper_metrics.total_gas_spent.clone(),
+        );
+
+        writable_registry.register(
+            "total_gas_fee_spent",
+            "Total amount of ETH spent on gas for executing callbacks",
+            keeper_metrics.total_gas_fee_spent.clone(),
+        );
+
+        writable_registry.register(
+            "requests_reprocessed",
+            "Number of price update requests reprocessed",
+            keeper_metrics.requests_reprocessed.clone(),
+        );
+
+        writable_registry.register(
+            "request_duration_ms",
+            "Time taken to process each successful callback request in milliseconds",
+            keeper_metrics.request_duration_ms.clone(),
+        );
+
+        writable_registry.register(
+            "retry_count",
+            "Number of retries for successful transactions",
+            keeper_metrics.retry_count.clone(),
+        );
+
+        writable_registry.register(
+            "final_gas_multiplier",
+            "Final gas multiplier percentage for successful transactions",
+            keeper_metrics.final_gas_multiplier.clone(),
+        );
+
+        writable_registry.register(
+            "final_fee_multiplier",
+            "Final fee multiplier percentage for successful transactions",
+            keeper_metrics.final_fee_multiplier.clone(),
+        );
+
+        writable_registry.register(
+            "gas_price_estimate",
+            "Gas price estimate for the blockchain (in gwei)",
+            keeper_metrics.gas_price_estimate.clone(),
+        );
+
+        // *Important*: When adding a new metric:
+        // 1. Register it above using `writable_registry.register(...)`
+        // 2. Add a get_or_create call in the loop below to initialize it for each chain/provider pair
+        for (chain_id, provider_address) in chain_labels {
+            let account_label = AccountLabel {
+                chain_id,
+                address: provider_address.to_string(),
+            };
+
+            let _ = keeper_metrics.balance.get_or_create(&account_label);
+            let _ = keeper_metrics.collected_fee.get_or_create(&account_label);
+            let _ = keeper_metrics.current_fee.get_or_create(&account_label);
+            let _ = keeper_metrics
+                .target_provider_fee
+                .get_or_create(&account_label);
+            let _ = keeper_metrics.total_gas_spent.get_or_create(&account_label);
+            let _ = keeper_metrics
+                .total_gas_fee_spent
+                .get_or_create(&account_label);
+            let _ = keeper_metrics.requests.get_or_create(&account_label);
+            let _ = keeper_metrics
+                .requests_processed
+                .get_or_create(&account_label);
+            let _ = keeper_metrics
+                .requests_processed_success
+                .get_or_create(&account_label);
+            let _ = keeper_metrics
+                .requests_processed_failure
+                .get_or_create(&account_label);
+            let _ = keeper_metrics
+                .requests_reprocessed
+                .get_or_create(&account_label);
+            let _ = keeper_metrics.callbacks_executed.get_or_create(&account_label);
+            let _ = keeper_metrics
+                .request_duration_ms
+                .get_or_create(&account_label);
+            let _ = keeper_metrics.retry_count.get_or_create(&account_label);
+            let _ = keeper_metrics
+                .final_gas_multiplier
+                .get_or_create(&account_label);
+            let _ = keeper_metrics
+                .final_fee_multiplier
+                .get_or_create(&account_label);
+            let _ = keeper_metrics
+                .gas_price_estimate
+                .get_or_create(&account_label);
+        }
+
+        keeper_metrics
+    }
+}
diff --git a/apps/argus/src/keeper/request.rs b/apps/argus/src/keeper/request.rs
new file mode 100644
index 0000000000..603320841d
--- /dev/null
+++ b/apps/argus/src/keeper/request.rs
@@ -0,0 +1,262 @@
+use {
+    crate::{
+        api::{self, BlockchainState},
+        chain::{ethereum::InstrumentedSignablePythContract, reader::BlockNumber},
+        keeper::hermes::fetch_price_updates_from_hermes,
+        keeper::keeper_metrics::{AccountLabel, KeeperMetrics},
+    },
+    anyhow::Result,
+    ethers::types::U256,
+    fortuna::eth_utils::utils::{submit_tx_with_backoff, EscalationPolicy},
+    std::{collections::HashSet, sync::Arc},
+    tokio::{
+        spawn,
+        sync::RwLock,
+        time::{self, Duration},
+    },
+    tracing::{self, Instrument},
+};
+
+/// How much to wait before retrying in case of an RPC error
+const RETRY_INTERVAL: Duration = Duration::from_secs(5);
+
+/// Get the latest safe block number for the chain. Retry internally if there is an error.
+/// This is still needed for logging and initialization purposes.
+pub async fn get_latest_safe_block(chain_state: &BlockchainState) -> BlockNumber {
+    loop {
+        match chain_state.contract.get_block_number().await {
+            Ok(latest_confirmed_block) => {
+                tracing::info!("Fetched latest safe block {}", latest_confirmed_block);
+                return latest_confirmed_block;
+            }
+            Err(e) => {
+                tracing::error!("Error while getting block number. error: {:?}", e);
+                time::sleep(RETRY_INTERVAL).await;
+            }
+        }
+    }
+}
+
+/// Process active requests fetched directly from contract storage
+#[tracing::instrument(name = "process_active_requests", skip_all)]
+pub async fn process_active_requests(
+    max_requests: usize,
+    contract: Arc<InstrumentedSignablePythContract>,
+    gas_limit: U256,
+    escalation_policy: EscalationPolicy,
+    chain_state: api::BlockchainState,
+    metrics: Arc<KeeperMetrics>,
+    fulfilled_requests_cache: Arc<RwLock<HashSet<u64>>>,
+    hermes_base_url: String,
+) {
+    tracing::info!("Processing active requests from contract storage");
+
+    loop {
+        let active_requests_res = chain_state.contract.get_active_requests(max_requests).await;
+
+        match active_requests_res {
+            Ok(requests) => {
+                tracing::info!(
+                    num_of_requests = &requests.len(),
+                    "Processing active requests"
+                );
+
+                for request in &requests {
+                    // The write lock guarantees we spawn only one task per sequence number
+                    let newly_inserted = fulfilled_requests_cache
+                        .write()
+                        .await
+                        .insert(request.sequence_number);
+
+                    if newly_inserted {
+                        spawn(
+                            process_request_with_backoff(
+                                request.clone(),
+                                chain_state.clone(),
+                                contract.clone(),
+                                gas_limit,
+                                escalation_policy.clone(),
+                                metrics.clone(),
+                                hermes_base_url.clone(),
+                            )
+                            .in_current_span(),
+                        );
+                    }
+                }
+
+                tracing::info!(
+                    num_of_requests = &requests.len(),
+                    "Processed active requests"
+                );
+                break;
+            }
+            Err(e) => {
+                tracing::error!(
+                    "Error while getting active requests. Waiting for {} seconds before retry. error: {:?}",
+                    RETRY_INTERVAL.as_secs(),
+                    e
+                );
+                time::sleep(RETRY_INTERVAL).await;
+            }
+        }
+    }
+}
+
+/// Process a request with backoff. It will retry the callback execution on failure for 5 minutes.
+#[tracing::instrument(name = "process_request_with_backoff", skip_all, fields(
+    sequence_number = request.sequence_number
+))]
+pub async fn process_request_with_backoff(
+    request: crate::chain::reader::Request,
+    chain_state: BlockchainState,
+    contract: Arc<InstrumentedSignablePythContract>,
+    gas_limit: U256,
+    escalation_policy: EscalationPolicy,
+    metrics: Arc<KeeperMetrics>,
+    hermes_base_url: String,
+) -> Result<()> {
+    // We process all price update requests for our provider
+    let account_label = AccountLabel {
+        chain_id: chain_state.id.clone(),
+        address: chain_state.provider_address.to_string(),
+    };
+
+    metrics.requests.get_or_create(&account_label).inc();
+    tracing::info!("Started processing request");
+
+    // Get the request details from the contract to get the publish_time and num_price_ids
+    let request_details = match chain_state
+        .contract
+        .get_request(request.sequence_number)
+        .await?
+    {
+        Some(req) => req,
+        None => {
+            tracing::warn!("Request not found on-chain, it may have been already fulfilled");
+            return Ok(());
+        }
+    };
+
+    // Filter price_ids to only include the first num_price_ids elements
+    let filtered_price_ids = if request_details.num_price_ids as usize <= request.price_ids.len() {
+        request.price_ids[..request_details.num_price_ids as usize].to_vec()
+    } else {
+        tracing::warn!(
+            "num_price_ids ({}) exceeds price_ids length ({}), using all available price_ids",
+            request_details.num_price_ids,
+            request.price_ids.len()
+        );
+        request.price_ids.clone()
+    };
+
+    tracing::info!(
+        "Filtered price_ids length: {:?}, Request num_price_ids: {:?}",
+        filtered_price_ids.len(),
+        request_details.num_price_ids
+    );
+
+    // Fetch price update data from Hermes for the filtered price IDs
+    let update_data = fetch_price_updates_from_hermes(
+        request_details.publish_time.as_u64(),
+        &filtered_price_ids,
+        hermes_base_url,
+    )
+    .await?;
+    tracing::info!("Fetched price update data from Hermes");
+
+    tracing::info!("Executing callback");
+    let contract_call = contract.execute_callback(
+        request.sequence_number,
+        update_data,
+        filtered_price_ids,
+    );
+
+    let success = submit_tx_with_backoff(
+        contract.client(),
+        contract_call,
+        gas_limit,
+        escalation_policy,
+    )
+    .await;
+    tracing::info!("Submitted callback");
+
+    metrics
+        .requests_processed
+        .get_or_create(&account_label)
+        .inc();
+
+    match success {
+        Ok(res) => {
+            tracing::info!("Processed request successfully in {:?}", res.duration);
+
+            metrics
+                .requests_processed_success
+                .get_or_create(&account_label)
+                .inc();
+
+            metrics
+                .request_duration_ms
+                .get_or_create(&account_label)
+                .observe(res.duration.as_millis() as f64);
+
+            // Track retry count, gas multiplier, and fee multiplier for successful transactions
+            metrics
+                .retry_count
+                .get_or_create(&account_label)
+                .observe(res.num_retries as f64);
+
+            metrics
+                .final_gas_multiplier
+                .get_or_create(&account_label)
+                .observe(res.gas_multiplier as f64);
+
+            metrics
+                .final_fee_multiplier
+                .get_or_create(&account_label)
+                .observe(res.fee_multiplier as f64);
+
+            if let Ok(receipt) = res.receipt {
+                if let Some(gas_used) = receipt.gas_used {
+                    let gas_used_float = gas_used.as_u128() as f64 / 1e18;
+                    metrics
+                        .total_gas_spent
+                        .get_or_create(&account_label)
+                        .inc_by(gas_used_float);
+
+                    if let Some(gas_price) = receipt.effective_gas_price {
+                        let gas_fee = (gas_used * gas_price).as_u128() as f64 / 1e18;
+                        metrics
+                            .total_gas_fee_spent
+                            .get_or_create(&account_label)
+                            .inc_by(gas_fee);
+                    }
+                }
+            }
+            metrics
+                .callbacks_executed
+                .get_or_create(&account_label)
+                .inc();
+        }
+        Err(e) => {
+            // In case the callback did not succeed, we double-check that the request is still on-chain.
+            // If the request is no longer on-chain, one of the transactions we sent likely succeeded, but
+            // the RPC gave us an error anyway.
+            let req = chain_state
+                .contract
+                .get_request(request.sequence_number)
+                .await;
+
+            tracing::error!("Failed to process request: {:?}. Request: {:?}", e, req);
+
+            // We only count failures for cases where we are completely certain that the callback failed.
+            if req.is_ok_and(|x| x.is_some()) {
+                metrics
+                    .requests_processed_failure
+                    .get_or_create(&account_label)
+                    .inc();
+            }
+        }
+    }
+
+    Ok(())
+}
diff --git a/apps/argus/src/keeper/track.rs b/apps/argus/src/keeper/track.rs
new file mode 100644
index 0000000000..6197ee225f
--- /dev/null
+++ b/apps/argus/src/keeper/track.rs
@@ -0,0 +1,80 @@
+use {
+    super::keeper_metrics::{AccountLabel, KeeperMetrics},
+    crate::{api::ChainId, chain::ethereum::InstrumentedPythContract},
+    ethers::middleware::Middleware,
+    ethers::{providers::Provider, types::Address},
+    fortuna::eth_utils::traced_client::TracedClient,
+    std::sync::Arc,
+    tracing,
+};
+
+/// tracks the balance of the given address on the given chain
+/// if there was an error, the function will just return
+#[tracing::instrument(skip_all)]
+pub async fn track_balance(
+    chain_id: String,
+    provider: Arc<Provider<TracedClient>>,
+    address: Address,
+    metrics: Arc<KeeperMetrics>,
+) {
+    let balance = match provider.get_balance(address, None).await {
+        // This conversion to u128 is fine as the total balance will never cross the limits
+        // of u128 practically.
+        Ok(r) => r.as_u128(),
+        Err(e) => {
+            tracing::error!("Error while getting balance. error: {:?}", e);
+            return;
+        }
+    };
+    // The f64 conversion is made to be able to serve metrics within the constraints of Prometheus.
+    // The balance is in wei, so we need to divide by 1e18 to convert it to eth.
+    let balance = balance as f64 / 1e18;
+
+    metrics
+        .balance
+        .get_or_create(&AccountLabel {
+            chain_id: chain_id.clone(),
+            address: address.to_string(),
+        })
+        .set(balance);
+}
+
+/// tracks the collected fees and provider information on the given chain
+/// if there is a error the function will just return
+#[tracing::instrument(skip_all)]
+pub async fn track_provider(
+    chain_id: ChainId,
+    contract: InstrumentedPythContract,
+    provider_address: Address,
+    metrics: Arc<KeeperMetrics>,
+) {
+    let provider_info = match contract.get_provider_info(provider_address).call().await {
+        Ok(info) => info,
+        Err(e) => {
+            tracing::error!("Error while getting provider info. error: {:?}", e);
+            return;
+        }
+    };
+
+    // The f64 conversion is made to be able to serve metrics with the constraints of Prometheus.
+    // The fee is in wei, so we divide by 1e18 to convert it to eth.
+    let collected_fee = provider_info.accrued_fees_in_wei as f64 / 1e18;
+    let current_fee: f64 = provider_info.fee_in_wei as f64 / 1e18;
+
+    // Track the provider's fee information
+    metrics
+        .collected_fee
+        .get_or_create(&AccountLabel {
+            chain_id: chain_id.clone(),
+            address: provider_address.to_string(),
+        })
+        .set(collected_fee);
+
+    metrics
+        .current_fee
+        .get_or_create(&AccountLabel {
+            chain_id: chain_id.clone(),
+            address: provider_address.to_string(),
+        })
+        .set(current_fee);
+}
diff --git a/apps/argus/src/lib.rs b/apps/argus/src/lib.rs
new file mode 100644
index 0000000000..784dac00c0
--- /dev/null
+++ b/apps/argus/src/lib.rs
@@ -0,0 +1,5 @@
+pub mod api;
+pub mod chain;
+pub mod command;
+pub mod config;
+pub mod keeper;
diff --git a/apps/argus/src/main.rs b/apps/argus/src/main.rs
new file mode 100644
index 0000000000..7e7ce6a5d0
--- /dev/null
+++ b/apps/argus/src/main.rs
@@ -0,0 +1,41 @@
+#![allow(clippy::just_underscores_and_digits)]
+
+use {
+    anyhow::Result,
+    clap::Parser,
+    argus::{command, config},
+    std::io::IsTerminal,
+};
+
+// Server TODO list:
+// - Tests
+// - Reduce memory requirements for storing hash chains to increase scalability
+// - Name things nicely (API resource names)
+// - README
+// - Choose data formats for binary data
+#[tokio::main]
+#[tracing::instrument]
+async fn main() -> Result<()> {
+    // Initialize a Tracing Subscriber
+    tracing::subscriber::set_global_default(
+        tracing_subscriber::fmt()
+            .compact()
+            .with_file(false)
+            .with_line_number(true)
+            .with_thread_ids(true)
+            .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+            .with_ansi(std::io::stderr().is_terminal())
+            .finish(),
+    )?;
+
+    match config::Options::parse() {
+        config::Options::GetRequest(opts) => command::get_request(&opts).await,
+        config::Options::Generate(opts) => command::generate(&opts).await,
+        config::Options::Run(opts) => command::run(&opts).await,
+        config::Options::RegisterProvider(opts) => command::register_provider(&opts).await,
+        config::Options::SetupProvider(opts) => command::setup_provider(&opts).await,
+        config::Options::RequestPriceUpdate(opts) => command::request_price_update(&opts).await,
+        config::Options::Inspect(opts) => command::inspect(&opts).await,
+        config::Options::WithdrawFees(opts) => command::withdraw_fees(&opts).await,
+    }
+}