Add MCP integration with x402 payment support

- Implement MCP client transport with automatic payment handling
- Add MCP server middleware for payment-gated tool access
- Support multi-chain payments (Base, Polygon, Solana)
- Include working example with client and server modes
- Reuse existing signers, facilitator, and payment types
- All code passes golangci-lint with zero issues

Author: ezynda3

.beads/issues.jsonl

@@ -53,3 +53,4 @@ bin/
 examples/x402demo/x402demo
 examples/gin/gin
 examples/gin/gin-example
+examples/mcp/mcp

.gitignore

@@ -0,0 +1,68 @@
+# MCP x402 Example
+
+This example demonstrates both client and server implementations of MCP with x402 payment integration.
+
+## Usage
+
+### Server Mode
+
+Start an MCP server with free and paid tools:
+
+```bash
+go run . -mode server -pay-to 0xYOUR_WALLET_ADDRESS
+```
+
+Options:
+- `-port` - Server port (default: 8080)
+- `-pay-to` - Payment recipient address (required for server mode)
+- `-facilitator` - Facilitator URL (default: https://facilitator.x402.rs)
+- `-verify-only` - Only verify payments, don't settle (useful for testing)
+- `-testnet` - Use Base Sepolia testnet
+- `-v` - Verbose logging
+
+### Client Mode
+
+Connect to an MCP server and call tools:
+
+```bash
+go run . -mode client -key YOUR_PRIVATE_KEY -server http://localhost:8080
+```
+
+Options:
+- `-server` - MCP server URL (default: http://localhost:8080)
+- `-key` - Private key for signing payments (required for client mode)
+- `-network` - Network to use (default: base)
+- `-testnet` - Use Base Sepolia testnet
+- `-v` - Verbose logging
+
+## Example Session
+
+Terminal 1 (Server):
+```bash
+# Start server with payment address
+go run . -mode server -pay-to 0x1234567890123456789012345678901234567890 -v
+```
+
+Terminal 2 (Client):
+```bash
+# Run client with private key
+go run . -mode client -key 0xYOUR_PRIVATE_KEY -v
+```
+
+The client will:
+1. Connect to the MCP server
+2. List available tools (echo - free, search - paid)
+3. Call the echo tool (no payment required)
+4. Call the search tool (automatically handles payment)
+
+## Tools
+
+### Free Tool: echo
+- Description: Echoes back the input message
+- Arguments: `message` (string, required)
+- Payment: None required
+
+### Paid Tool: search
+- Description: Premium search service
+- Arguments: `query` (string, required), `max_results` (number, optional)
+- Payment: 0.01 USDC on Base (or Base Sepolia if using -testnet)

examples/mcp/README.md

@@ -0,0 +1,41 @@
+module github.com/mark3labs/x402-go/examples/mcp
+
+go 1.25.1
+
+replace github.com/mark3labs/x402-go => ../..
+
+require (
+	github.com/mark3labs/mcp-go v0.42.0
+	github.com/mark3labs/x402-go v0.0.0-00010101000000-000000000000
+)
+
+require (
+	github.com/FactomProject/basen v0.0.0-20150613233007-fe3947df716e // indirect
+	github.com/FactomProject/btcutilecc v0.0.0-20130527213604-d3a63a5752ec // indirect
+	github.com/bahlo/generic-list-go v0.2.0 // indirect
+	github.com/bits-and-blooms/bitset v1.24.2 // indirect
+	github.com/buger/jsonparser v1.1.1 // indirect
+	github.com/consensys/gnark-crypto v0.19.2 // indirect
+	github.com/crate-crypto/go-eth-kzg v1.4.0 // indirect
+	github.com/crate-crypto/go-ipa v0.0.0-20240724233137-53bbb0ceb27a // indirect
+	github.com/deckarep/golang-set/v2 v2.8.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 // indirect
+	github.com/ethereum/c-kzg-4844/v2 v2.1.5 // indirect
+	github.com/ethereum/go-ethereum v1.16.5 // indirect
+	github.com/ethereum/go-verkle v0.2.2 // indirect
+	github.com/fsnotify/fsnotify v1.9.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/holiman/uint256 v1.3.2 // indirect
+	github.com/invopop/jsonschema v0.13.0 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/spf13/cast v1.10.0 // indirect
+	github.com/supranational/blst v0.3.16 // indirect
+	github.com/tyler-smith/go-bip32 v1.0.0 // indirect
+	github.com/tyler-smith/go-bip39 v1.1.0 // indirect
+	github.com/wk8/go-ordered-map/v2 v2.1.8 // indirect
+	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
+	golang.org/x/crypto v0.43.0 // indirect
+	golang.org/x/sync v0.17.0 // indirect
+	golang.org/x/sys v0.37.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

examples/mcp/go.mod

@@ -0,0 +1,131 @@
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