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X402 MCP Template

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X402 MCP Template ๐Ÿค–๐Ÿ’ฐ

Production-ready MCP server template for consuming X402-protected APIs with gasless micropayments

This template provides everything you need to create an MCP (Model Context Protocol) server that can consume X402-enabled APIs, enabling AI agents like Claude to make micropayment-based API calls seamlessly.

๐Ÿค– For AI Developers: See CLAUDE.md for comprehensive X402 + MCP integration documentation, payment flows, and AI development guidance.

โœจ Features

  • ๐Ÿ” X402 Gasless Micropayments - EIP-712 signatures, no gas fees for API consumption

  • ๐ŸŽญ Dual Mode Operation - Demo mode (no wallet) and Payment mode (with wallet)

  • ๐Ÿ” Service Discovery - Automatic discovery of X402 API capabilities

  • ๐Ÿค– Claude Desktop Ready - Drop-in integration with Claude Desktop

  • ๐Ÿ“ก MCP Inspector Compatible - Test and debug with MCP Inspector

  • ๐Ÿญ Production-Ready - Mainnet (Base) and testnet (Base Sepolia) support

  • ๐Ÿ“ Full TypeScript - Type-safe development with comprehensive types

  • โšก Auto-Payment Handling - Automatic 402 retry with payment authorization

๐Ÿ—๏ธ Architecture

MCP + X402 Integration Flow

โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ Claude Desktop / MCP Client โ”‚ โ”‚ โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ โ”‚ โ”‚ User Request: "Search for coffee shops near me" โ”‚ โ”‚ โ”‚ โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜ โ”‚ โ”‚ โ†“ โ”‚ โ”‚ โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ โ”‚ โ”‚ MCP Protocol: CallTool("search_places", {query: "coffee"}) โ”‚ โ”‚ โ”‚ โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜ โ”‚ โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜ โ†“ โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ X402 MCP Server (This Template) โ”‚ โ”‚ โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ โ”‚ โ”‚ Tool Handler: Receives request โ”‚ โ”‚ โ”‚ โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜ โ”‚ โ”‚ โ†“ โ”‚ โ”‚ โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ โ”‚ โ”‚ X402 Payment Client (x402-axios) โ”‚ โ”‚ โ”‚ โ”‚ - EIP-712 signature generation โ”‚ โ”‚ โ”‚ โ”‚ - Automatic 402 retry handling โ”‚ โ”‚ โ”‚ โ”‚ - Payment authorization โ”‚ โ”‚ โ”‚ โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜ โ”‚ โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜ โ†“ โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ X402-Protected API Server โ”‚ โ”‚ โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ โ”‚ โ”‚ 1. First Request: Returns 402 Payment Required โ”‚ โ”‚ โ”‚ โ”‚ - Includes payment requirements (price, network, address) โ”‚ โ”‚ โ”‚ โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜ โ”‚ โ”‚ โ†“ โ”‚ โ”‚ โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ โ”‚ โ”‚ 2. Payment Processing: โ”‚ โ”‚ โ”‚ โ”‚ - Verify EIP-712 signature โ”‚ โ”‚ โ”‚ โ”‚ - Submit to facilitator โ”‚ โ”‚ โ”‚ โ”‚ - Execute USDC transfer (gasless) โ”‚ โ”‚ โ”‚ โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜ โ”‚ โ”‚ โ†“ โ”‚ โ”‚ โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ โ”‚ โ”‚ 3. Second Request: Payment authorized, returns data โ”‚ โ”‚ โ”‚ โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜ โ”‚ โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜ โ†“ โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ Result Returned to Claude โ”‚ โ”‚ - API response data โ”‚ โ”‚ - Payment metadata โ”‚ โ”‚ - Cost information โ”‚ โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜

Key Points:

  • MCP handles tool protocol and Claude communication

  • x402-axios handles payment protocol automatically

  • User only needs wallet with USDC - no manual payment steps

  • All payment complexity is abstracted away

๐Ÿ“ Project Structure

Template-x402-Mcp/ โ”œโ”€โ”€ index.ts # Main MCP server implementation โ”œโ”€โ”€ package.json # Dependencies and scripts โ”œโ”€โ”€ tsconfig.json # TypeScript configuration โ”œโ”€โ”€ .env.example # Environment variables template โ”œโ”€โ”€ README.md # This file - setup and usage guide โ””โ”€โ”€ CLAUDE.md # AI-friendly X402 + MCP documentation

๐Ÿš€ Quick Start

1. Clone and Setup

# Navigate to template directory cd Template-x402-Mcp # Install dependencies npm install # Copy environment variables cp .env.example .env

2. Configure Environment

Edit .env file:

Option A: Demo Mode (No Payment)

# Leave PRIVATE_KEY empty or with placeholder PRIVATE_KEY=<your-private-key-here> # Set your X402 API endpoint RESOURCE_SERVER_URL=https://places-api.x402hub.xyz # Network (testnet for demo) NETWORK=base-sepolia

Option B: Payment Mode (X402 Enabled)

# Add your wallet private key PRIVATE_KEY=0x1234567890abcdef... # Set your X402 API endpoint RESOURCE_SERVER_URL=https://places-api.x402hub.xyz # Network: base-sepolia (testnet) or base (mainnet) NETWORK=base-sepolia

3. Customize Your Tools

Edit

// In ListToolsRequestSchema handler { name: "your_custom_tool", description: "Description of what your tool does", inputSchema: { type: "object", properties: { // Define your input parameters param1: { type: "string", description: "Parameter description" } }, required: ["param1"] } }

Add tool handler:

case "your_custom_tool": { const { param1 } = args as { param1: string }; // Make X402-protected API call const response = await client.post("/api/your-endpoint", { param1: param1 }); return { content: [{ type: "text", text: JSON.stringify(response.data, null, 2) }] }; }

4. Build and Test

# Build TypeScript npm run build # Test with MCP Inspector npm run inspector # Or test in development mode npm run dev

5. Claude Desktop Integration

Add to Claude Desktop configuration:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%\Claude\claude_desktop_config.json

{ "mcpServers": { "x402-your-api": { "command": "node", "args": ["/absolute/path/to/Template-x402-Mcp/build/index.js"], "env": { "PRIVATE_KEY": "0x...", "RESOURCE_SERVER_URL": "https://your-x402-api.example.com", "NETWORK": "base-sepolia" } } } }

Restart Claude Desktop and your tools will be available!

๐Ÿ”‘ Getting USDC for Testing

Testnet (Base Sepolia)

# Use Circle's testnet faucet # Visit: https://faucet.circle.com/ # Enter your wallet address # Receive free testnet USDC

Mainnet (Base)

Buy USDC on Base network through:

๐Ÿ“– Available Tools

Built-in Tools

Tool

Description

Mode

example_api_call

Template tool for X402 API calls

Both

service_info

Get API service discovery metadata

Both

health_check

Check API availability

Both

Demo Mode: Returns sample data with setup instructions Payment Mode: Makes real X402-protected API calls

๐ŸŽญ Demo Mode vs Payment Mode

Demo Mode (No Private Key)

Features:

  • โœ… Works immediately without wallet setup

  • โœ… Returns sample data for all tools

  • โœ… Shows setup instructions in responses

  • โœ… Perfect for development and testing MCP integration

  • โŒ Cannot make real API calls

Use Cases:

  • Testing MCP server functionality

  • Developing tool definitions

  • Claude Desktop integration testing

  • Learning X402 protocol flow

Payment Mode (With Private Key)

Features:

  • โœ… Makes real X402-protected API calls

  • โœ… Automatic payment handling (no manual steps)

  • โœ… Gasless USDC transfers

  • โœ… Production-ready

  • โš ๏ธ Requires USDC balance in wallet

Use Cases:

  • Production AI agent deployments

  • Real data consumption

  • Paid API access

  • Enterprise integrations

๐Ÿ› ๏ธ Customization Guide

Adding a New Tool

Step 1: Add tool definition in ListToolsRequestSchema handler:

{ name: "get_data_by_id", description: "Fetch specific data by ID from X402 API", inputSchema: { type: "object", properties: { id: { type: "string", description: "Unique identifier for the data" } }, required: ["id"] } }

Step 2: Add tool handler in CallToolRequestSchema handler:

case "get_data_by_id": { const { id } = args as { id: string }; if (!id?.trim()) { throw new McpError(ErrorCode.InvalidParams, "ID parameter is required"); } // Demo mode fallback if (!paymentEnabled) { return { content: [{ type: "text", text: JSON.stringify({ demo_mode: true, sample_data: { id, name: "Sample Data" }, setup_instructions: { /* ... */ } }, null, 2) }] }; } // Payment mode - real API call const response = await client.get(`/api/data/${id}`); return { content: [{ type: "text", text: JSON.stringify(response.data, null, 2) }] }; }

Changing API Endpoint

# In .env file RESOURCE_SERVER_URL=https://your-new-api.example.com

Switching Networks

# Testnet (Base Sepolia) NETWORK=base-sepolia # Mainnet (Base) NETWORK=base

๐Ÿ” Service Discovery

Your MCP server automatically fetches X402 service metadata from /.well-known/x402:

// Automatically called by service_info tool const response = await axios.get(`${baseURL}/.well-known/x402`); // Returns: { "service": "API Service Name", "version": "1.0.0", "payment": { "protocol": "x402 v1.0", "price": "$0.001", "network": "base-sepolia" }, "endpoints": { "/api/endpoint": { "method": "POST", "description": "...", "inputSchema": { /* ... */ }, "outputSchema": { /* ... */ } } } }

Use this metadata to dynamically generate tools or provide API documentation to users.

๐Ÿ” Security Best Practices

  1. Never commit - Use .env.example as template

  2. Rotate private keys - Change keys regularly for production

  3. Use separate wallets - Different addresses for testnet/mainnet

  4. Monitor USDC balance - Track spending and set alerts

  5. Validate API responses - Check data integrity and structure

  6. Error handling - Don't expose sensitive info in errors

  7. Rate limiting - Implement client-side rate limits if needed

๐Ÿ“Š Monitoring

Check Wallet Balance

Monitor your USDC balance and payment transactions:

Server Logs

# Development mode with logs npm run dev # Check payment status # Logs show: โœ… Payment client initialized, wallet address, network

MCP Inspector

# Test tools interactively npm run inspector # Check: # - Tool definitions are correct # - Payment mode is active # - API responses are valid

๐Ÿงช Testing

Test with MCP Inspector

# Start inspector npm run inspector # Test tools: 1. Select "service_info" - should return API metadata 2. Select "health_check" - should return API health status 3. Select your custom tools - should work in demo or payment mode

Test with Claude Desktop

  1. Add to config (see Claude Desktop Integration above)

  2. Restart Claude Desktop

  3. Test in conversation:

    You: Can you check the service info for the X402 API? Claude: [Uses service_info tool, shows API metadata] You: Search for coffee shops near me Claude: [Uses your custom tool, makes payment if enabled]

Verify Payment Flow

Demo Mode:

  • Tools return sample data

  • Response includes setup instructions

  • No USDC required

Payment Mode:

  • First call triggers 402 response

  • x402-axios automatically retries with payment

  • USDC transferred (check explorer)

  • Real data returned

๐Ÿ†˜ Troubleshooting

"Running in DEMO MODE"

Issue: Private key not configured or invalid

Solutions:

  1. Check .env file has valid PRIVATE_KEY=0x... (66 characters)

  2. Ensure private key is not placeholder <your-private-key-here>

  3. Verify key format: 0x followed by 64 hex characters

"Payment Required: Insufficient USDC balance"

Issue: Wallet doesn't have enough USDC

Solutions:

  1. Get testnet USDC: https://faucet.circle.com/

  2. For mainnet, buy USDC on Base network

  3. Check balance in explorer (link above)

"Tool execution failed"

Issue: API endpoint or configuration problem

Solutions:

  1. Verify RESOURCE_SERVER_URL is correct and accessible

  2. Check if API supports X402 protocol

  3. Use health_check tool to test connectivity

  4. Use service_info tool to verify API configuration

MCP Server Not Appearing in Claude

Issue: Claude Desktop not detecting MCP server

Solutions:

  1. Verify build/index.js exists: npm run build

  2. Check Claude Desktop config has absolute path

  3. Restart Claude Desktop completely

  4. Check logs in Claude Desktop developer tools

๐Ÿ“š Resources

๐Ÿ“„ License

MIT License - see LICENSE file for details

๐Ÿค Contributing

This is a template - fork it and make it your own!

  1. Clone the template

  2. Customize for your X402 API

  3. Deploy and share your MCP server

Built with โค๏ธ using X402 Protocol + Model Context Protocol

Replace this template with your own API integration and enable AI agents to consume your services! ๐Ÿš€

Deploy Server
-
security - not tested
F
license - not found
-
quality - not tested

How are these scores calculated?

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

Tools

Production-ready MCP server template for consuming X402-protected APIs with gasless micropayments. Enables AI agents like Claude to make micropayment-based API calls seamlessly using EIP-712 signatures and USDC transfers.

  1. โœจ Features
    1. ๐Ÿ—๏ธ Architecture
      1. MCP + X402 Integration Flow
    2. ๐Ÿ“ Project Structure
      1. ๐Ÿš€ Quick Start
        1. 1. Clone and Setup
        2. 2. Configure Environment
        3. 3. Customize Your Tools
        4. 4. Build and Test
        5. 5. Claude Desktop Integration
      2. ๐Ÿ”‘ Getting USDC for Testing
        1. Testnet (Base Sepolia)
        2. Mainnet (Base)
      3. ๐Ÿ“– Available Tools
        1. Built-in Tools
      4. ๐ŸŽญ Demo Mode vs Payment Mode
        1. Demo Mode (No Private Key)
        2. Payment Mode (With Private Key)
      5. ๐Ÿ› ๏ธ Customization Guide
        1. Adding a New Tool
        2. Changing API Endpoint
        3. Switching Networks
      6. ๐Ÿ” Service Discovery
        1. ๐Ÿ” Security Best Practices
          1. ๐Ÿ“Š Monitoring
            1. Check Wallet Balance
            2. Server Logs
            3. MCP Inspector
          2. ๐Ÿงช Testing
            1. Test with MCP Inspector
            2. Test with Claude Desktop
            3. Verify Payment Flow
          3. ๐Ÿ†˜ Troubleshooting
            1. "Running in DEMO MODE"
            2. "Payment Required: Insufficient USDC balance"
            3. "Tool execution failed"
            4. MCP Server Not Appearing in Claude
          4. ๐Ÿ“š Resources
            1. ๐Ÿ“„ License
              1. ๐Ÿค Contributing

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