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formating fix and use copy address directly
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‎apps/developer-hub/content/docs/express-relay/contract-addresses.mdx‎

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Express Relay is currently deployed on the following SVM environments:
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---
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import CopyAddress from "../../../src/components/CopyAddress";
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<Tabs items={['Production', 'Testing']}>
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<Tab value="production">
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**Auction Server endpoint:** <CopyAddress address="https://per-mainnet.dourolabs.app/" />
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**Network Details (Solana Mainnet-Beta):**
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| Name | Address/Value |
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| Name | Address/Value |
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| ------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| Express Relay Program | <CopyAddress address="PytERJFhAKuNNuaiXkApLfWzwNwSNDACpigT3LwQfou" url="https://solscan.io/account/PytERJFhAKuNNuaiXkApLfWzwNwSNDACpigT3LwQfou" /> |
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| Limo Limit Order Program | <CopyAddress address="LiMoM9rMhrdYrfzUCxQppvxCSG1FcrUK9G8uLq4A1GF" url="https://solscan.io/account/LiMoM9rMhrdYrfzUCxQppvxCSG1FcrUK9G8uLq4A1GF" /> |
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| Chain Id | <CopyAddress address="solana" /> |
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| Public RPC | <CopyAddress address="https://api.mainnet-beta.solana.com" /> |
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| Limo Global Order Config | <CopyAddress address="prod7Mog8r56sn5dPwze8nVdf94veEawdxNNqd5v7A1" url="https://solscan.io/account/prod7Mog8r56sn5dPwze8nVdf94veEawdxNNqd5v7A1" /> |
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| Frontend | <CopyAddress address="https://swap.kamino.finance" url="https://swap.kamino.finance" /> |
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| Express Relay Program | <CopyAddress address="PytERJFhAKuNNuaiXkApLfWzwNwSNDACpigT3LwQfou" url="https://solscan.io/account/PytERJFhAKuNNuaiXkApLfWzwNwSNDACpigT3LwQfou" /> |
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| Limo Limit Order Program | <CopyAddress address="LiMoM9rMhrdYrfzUCxQppvxCSG1FcrUK9G8uLq4A1GF" url="https://solscan.io/account/LiMoM9rMhrdYrfzUCxQppvxCSG1FcrUK9G8uLq4A1GF" /> |
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| Chain Id | <CopyAddress address="solana" /> |
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| Public RPC | <CopyAddress address="https://api.mainnet-beta.solana.com" /> |
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| Limo Global Order Config | <CopyAddress address="prod7Mog8r56sn5dPwze8nVdf94veEawdxNNqd5v7A1" url="https://solscan.io/account/prod7Mog8r56sn5dPwze8nVdf94veEawdxNNqd5v7A1" /> |
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| Frontend | <CopyAddress address="https://swap.kamino.finance" url="https://swap.kamino.finance" /> |
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</Tab>
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<Tab value="testing">
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**Auction Server endpoint:** <CopyAddress address="https://per-staging.dourolabs.app/" />
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**Network Details (Solana Mainnet-Beta):**
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| Name | Address/Value |
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| Name | Address/Value |
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| ------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| Express Relay Program (Swaps) | <CopyAddress address="stag1NN9voD7436oFvKmy1kvRZYLLW8drKocSCt2W79" url="https://solscan.io/account/stag1NN9voD7436oFvKmy1kvRZYLLW8drKocSCt2W79" /> |
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| Express Relay Program (Limit Orders) | <CopyAddress address="PytERJFhAKuNNuaiXkApLfWzwNwSNDACpigT3LwQfou" url="https://solscan.io/account/PytERJFhAKuNNuaiXkApLfWzwNwSNDACpigT3LwQfou" /> |
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| Limo Limit Order Program | <CopyAddress address="LiMoM9rMhrdYrfzUCxQppvxCSG1FcrUK9G8uLq4A1GF" url="https://solscan.io/account/LiMoM9rMhrdYrfzUCxQppvxCSG1FcrUK9G8uLq4A1GF" /> |
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| Chain Id | <CopyAddress address="development-solana" /> |
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| Public RPC | <CopyAddress address="https://api.mainnet-beta.solana.com" /> |
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| Limo Global Order Config | <CopyAddress address="TeStcUQMmECYEtdeXo9cXpktQWaGe4bhJ7zxAUMzB2X" url="https://solscan.io/account/TeStcUQMmECYEtdeXo9cXpktQWaGe4bhJ7zxAUMzB2X" /> |
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| Testing Frontend | <CopyAddress address="https://limo.kamino-webapp.pages.dev/swap" url="https://limo.kamino-webapp.pages.dev/swap" /> |
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| Express Relay Program (Swaps) | <CopyAddress address="stag1NN9voD7436oFvKmy1kvRZYLLW8drKocSCt2W79" url="https://solscan.io/account/stag1NN9voD7436oFvKmy1kvRZYLLW8drKocSCt2W79" /> |
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| Express Relay Program (Limit Orders) | <CopyAddress address="PytERJFhAKuNNuaiXkApLfWzwNwSNDACpigT3LwQfou" url="https://solscan.io/account/PytERJFhAKuNNuaiXkApLfWzwNwSNDACpigT3LwQfou" /> |
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| Limo Limit Order Program | <CopyAddress address="LiMoM9rMhrdYrfzUCxQppvxCSG1FcrUK9G8uLq4A1GF" url="https://solscan.io/account/LiMoM9rMhrdYrfzUCxQppvxCSG1FcrUK9G8uLq4A1GF" /> |
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| Chain Id | <CopyAddress address="development-solana" /> |
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| Public RPC | <CopyAddress address="https://api.mainnet-beta.solana.com" /> |
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| Limo Global Order Config | <CopyAddress address="TeStcUQMmECYEtdeXo9cXpktQWaGe4bhJ7zxAUMzB2X" url="https://solscan.io/account/TeStcUQMmECYEtdeXo9cXpktQWaGe4bhJ7zxAUMzB2X" /> |
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| Testing Frontend | <CopyAddress address="https://limo.kamino-webapp.pages.dev/swap" url="https://limo.kamino-webapp.pages.dev/swap" /> |
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### This list contains the addresses of the commonly used assets present in opportunities on development-solana:
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| Asset | Address |
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| ----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| WSOL | <CopyAddress address="So11111111111111111111111111111111111111112" url="https://solscan.io/account/So11111111111111111111111111111111111111112" /> |
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| USDC | <CopyAddress address="EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v" url="https://solscan.io/account/EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v" /> |
45+
| Asset | Address |
46+
| ----- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
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| WSOL | <CopyAddress address="So11111111111111111111111111111111111111112" url="https://solscan.io/account/So11111111111111111111111111111111111111112" /> |
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| USDC | <CopyAddress address="EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v" url="https://solscan.io/account/EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v" /> |
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</Tab>
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</Tabs>

‎apps/developer-hub/content/docs/express-relay/errors.mdx‎

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## ExpressRelay
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| Error Code | Name | Description |
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|------------|------|-------------|
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| 6000 | `InvalidPermissionPda` | The permission PDA is invalid |
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| 6001 | `InvalidPermissionKeypair` | The permission keypair is invalid |
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| 6002 | `InvalidRouter` | The router is invalid |
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| 6003 | `DeadlineExceeded` | The bid deadline has been exceeded |
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| 6004 | `InsufficientFee` | The fee is insufficient |
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| 6005 | `InvalidChainId` | The chain ID is invalid |
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| 6006 | `InvalidFeeReceiver` | The fee receiver is invalid |
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| 6007 | `InvalidFeePayer` | The fee payer is invalid |
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| 6008 | `InvalidRelayerSigner` | The relayer signer is invalid |
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| 6009 | `RouterExecutionFailed` | Router execution failed |
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| 6010 | `BidAmountTooLow` | The bid amount is too low |
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| 6011 | `InvalidBidAmount` | The bid amount is invalid |
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| 6012 | `PermissionAccountNotWritable` | The permission account is not writable |
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| 6013 | `InvalidDestination` | The destination is invalid |
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| 6014 | `InvalidMetadata` | The metadata is invalid |
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| 6015 | `InvalidConfigPda` | The config PDA is invalid |
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| 6016 | `InvalidAdmin` | The admin is invalid |
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| 6017 | `FeeSplitOutOfRange` | The fee split is out of range |
31-
| 6018 | `MaxBidAmountLessThanMinBidAmount` | The maximum bid amount is less than the minimum bid amount |
11+
| Error Code | Name | Description |
12+
| ---------- | ---------------------------------- | ---------------------------------------------------------- |
13+
| 6000 | `InvalidPermissionPda` | The permission PDA is invalid |
14+
| 6001 | `InvalidPermissionKeypair` | The permission keypair is invalid |
15+
| 6002 | `InvalidRouter` | The router is invalid |
16+
| 6003 | `DeadlineExceeded` | The bid deadline has been exceeded |
17+
| 6004 | `InsufficientFee` | The fee is insufficient |
18+
| 6005 | `InvalidChainId` | The chain ID is invalid |
19+
| 6006 | `InvalidFeeReceiver` | The fee receiver is invalid |
20+
| 6007 | `InvalidFeePayer` | The fee payer is invalid |
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| 6008 | `InvalidRelayerSigner` | The relayer signer is invalid |
22+
| 6009 | `RouterExecutionFailed` | Router execution failed |
23+
| 6010 | `BidAmountTooLow` | The bid amount is too low |
24+
| 6011 | `InvalidBidAmount` | The bid amount is invalid |
25+
| 6012 | `PermissionAccountNotWritable` | The permission account is not writable |
26+
| 6013 | `InvalidDestination` | The destination is invalid |
27+
| 6014 | `InvalidMetadata` | The metadata is invalid |
28+
| 6015 | `InvalidConfigPda` | The config PDA is invalid |
29+
| 6016 | `InvalidAdmin` | The admin is invalid |
30+
| 6017 | `FeeSplitOutOfRange` | The fee split is out of range |
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| 6018 | `MaxBidAmountLessThanMinBidAmount` | The maximum bid amount is less than the minimum bid amount |

‎apps/developer-hub/content/docs/express-relay/how-express-relay-works/index.mdx‎

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description: >-
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Understand how Express Relay eliminates MEV through off-chain auctions and priority mechanisms for protocol operations.
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---
6+
67
Express Relay allows protocols to eliminate [Maximal Extractable Value](https://www.ledger.com/academy/glossary/maximal-extractable-value-mev) (MEV).
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Many protocols generate MEV on a regular basis.
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For example, borrow-lending protocols provide bonuses to searchers for liquidating undercollateralized loans.

‎apps/developer-hub/content/docs/express-relay/how-express-relay-works/opportunities.mdx‎

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Understand what opportunities are in Express Relay, how they work, and how the Opportunity Adapter unifies different protocols.
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# Opportunities
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In the context of Express Relay, an opportunity refers to a potential transaction that a searcher can execute on a protocol. Typically, the term "opportunity" is used for such transactions that are lucrative and therefore competed for by many searchers.

‎apps/developer-hub/content/docs/express-relay/how-express-relay-works/permissioning.mdx‎

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Learn how Express Relay uses permission IDs and keys to manage access control and distinguish between different opportunities.
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`permissionId` is a `bytes` object that represents the unique identifier of a position within the protocol. `permissionId` allows the system to distinguish between bids competing on different opportunities and thereby run more scoped and efficient auctions.
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Each borrower has a unique position for some protocols, so the borrower address uniquely identifies a position.

‎apps/developer-hub/content/docs/express-relay/http-api-reference.mdx‎

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The complete HTTP API reference is available as an interactive Swagger/OpenAPI documentation:
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**Production (Mainnet):**
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[https://per-mainnet.dourolabs.app/docs](https://per-mainnet.dourolabs.app/docs)
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- **Production (Mainnet):** https://per-mainnet.dourolabs.app
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- **Staging (Testing):** https://per-staging.dourolabs.app
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‎apps/developer-hub/content/docs/express-relay/integrate-as-protocol.mdx‎

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const quote = await client.getQuote(quoteRequest);
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```
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*quote* contains the full details, including the amount the searcher is quoting and the transaction that the user needs to sign. It also contains an *expirationTime*; after this time, the transaction will no longer succeed on chain, so you should request a new quote a few seconds before the *expirationTime*.
45+
_quote_ contains the full details, including the amount the searcher is quoting and the transaction that the user needs to sign. It also contains an _expirationTime_; after this time, the transaction will no longer succeed on chain, so you should request a new quote a few seconds before the _expirationTime_.
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## Step 3: Submit User Signature to the Express Relay Server
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‎apps/developer-hub/content/docs/express-relay/integrate-as-searcher/index.mdx‎

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import { IntegrationCard } from "../../../../src/components/IntegrationCard";
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import { Code } from "@phosphor-icons/react/dist/ssr";
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## Integration Methods
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Express Relay provides multiple ways for searchers to integrate:
@@ -58,4 +57,4 @@ If your bid wins the auction, execute the opportunity by:
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description="Complete guide for integrating Express Relay on Solana Virtual Machine chains with code examples and best practices"
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icon={<Code size={16} />}
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/>
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</div>
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</div>

‎apps/developer-hub/content/docs/express-relay/integrate-as-searcher/svm.mdx‎

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```typescript
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import { OpportunitySvm } from "../index";
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import { BidSvm } from "../types";
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import * as anchor from "@coral-xyz/anchor";
170170
import * as limo from "@kamino-finance/limo-sdk";
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/**
173173
* Generates a bid for a given opportunity.
174174
* The transaction in this bid transfers assets from the searcher's wallet to fulfill the limit order.
@@ -181,7 +181,7 @@ async generateBid(opportunity: OpportunitySvm): Promise<BidSvm> {
181181
this.connectionSvm,
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order.state.globalConfig
183183
);
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const ixsTakeOrder = await this.generateTakeOrderIxs(limoClient, order);
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const feeInstruction = ComputeBudgetProgram.setComputeUnitPrice({
187187
microLamports:
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feeInstruction,
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...ixsTakeOrder
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);
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const bidAmount = await this.getBidAmount(order);
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const config = await this.getExpressRelayConfig();
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const bid = await this.client.constructSvmBid(
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txRaw,
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206206
config.relayerSigner,
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config.feeReceiverRelayer
208208
);
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bid.transaction.recentBlockhash =
211211
this.latestChainUpdate[this.chainId].blockhash;
212212
bid.transaction.sign(this.searcher);
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224224
"env": "svm"
225225
}
226226
```
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where the serialized transaction object should contain an Express Relay SubmitBid instruction that specifies the amount you are bidding and the permission details.
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where the serialized transaction object should contain an Express Relay SubmitBid instruction that specifies the amount you are bidding and the permission details.
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</Tab>
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<Tab value="python">
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```python
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import logging
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from solders.transaction import Transaction
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from express_relay.models.svm import BidSvm
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from express_relay.svm.limo_client import OrderStateAndAddress
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DEADLINE = 2**62
244244
logger = logging.getLogger(__name__)
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async def generate_bid(self, opp: OpportunitySvm) -> BidSvm:
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"""
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Generates a bid for a given opportunity.
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The transaction in this bid transfers assets from the searcher's wallet to fulfill the limit order.
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Args:
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opp: The SVM opportunity to bid on.
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Returns:
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The generated bid object.
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"""
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order: OrderStateAndAddress = {"address": opp.order_address, "state": opp.order}
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ixs_take_order = await self.generate_take_order_ixs(order)
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bid_amount = await self.get_bid_amount(order)
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router = self.limo_client.get_pda_authority(
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self.limo_client.get_program_id(), order["state"].global_config
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)
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submit_bid_ix = self.client.get_svm_submit_bid_instruction(
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searcher=self.private_key.pubkey(),
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router=router,
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```
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The bid you construct will look like
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```
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293294
}
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```
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where the serialized transaction object should contain an Express Relay SubmitBid instruction that specifies the amount you are bidding and the permission details.
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where the serialized transaction object should contain an Express Relay SubmitBid instruction that specifies the amount you are bidding and the permission details.
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</Tab>
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</Tabs>
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The code snippet below demonstrates how to submit a bid using the Typescript SDK:
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```typescript
313313
const generateBid = async (opportunity: OpportunitySvm, recentBlockhash: Blockhash): BidSvm => {
314314
...
315315
}
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const handleOpportunity = async (opportunity: Opportunity) => {
318318
...
319319
const bid = await this.generateBid(opportunity as OpportunitySvm);
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```python
330330
import typing
331-
331+
332332
async def generate_bid(opp: OpportunitySvm) -> BidSvm:
333333
...
334-
334+
335335
def opportunity_callback(opportunity: Opportunity):
336336
bid = await self.assess_opportunity(typing.cast(OpportunitySvm, opp))
337337
await client.submit_bid(bid, subscribe_to_updates=True)
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```json
378378
{
379-
"id": "1", // Websocket request id
379+
"id": "1", // Websocket request id
380380
"status": "success",
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"result": {
382-
"id": "beedbeed-b346-4fa1-8fab-2541a9e1872d", // Bid id
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"id": "beedbeed-b346-4fa1-8fab-2541a9e1872d", // Bid id
383383
"status": "OK"
384384
}
385385
}
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```
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Consult Websocket API reference for more details.
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Consult Websocket API reference for more details.
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</Tab>
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‎apps/developer-hub/content/docs/express-relay/websocket-api-reference.mdx‎

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The WebSocket server responds to ping messages according to WebSocket standards.
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Additionally, the server periodically sends a ping message to the client to ensure the connection is still active and expects a pong in return.
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