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@codespar/mcp-x402

v0.1.1

Published

MCP server for x402 — HTTP-native micropayments protocol by Coinbase (USDC on Base/Solana)

Vulnerabilities

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  • 0Low

Links

Maintainers

codespar-npmcodespar-npm

Keywords

mcpx402coinbasemicropaymentsusdchttp-402machine-to-machineagentic-paymentsbasesolana

Readme

@codespar/mcp-x402

MCP server for x402 — HTTP-native micropayments protocol by Coinbase (USDC on Base/Solana)

npm License: MIT

What is x402?

x402 is an open protocol that enables machine-to-machine micropayments at the HTTP layer. When an AI agent requests a resource and receives HTTP 402 Payment Required, it automatically sends a USDC payment on-chain and retries — no checkout UI, no merchant integration, pure HTTP.

This is the payment rail purpose-built for agentic commerce.

Quick Start

Claude Desktop

Add to ~/.config/claude/claude_desktop_config.json:

{
  "mcpServers": {
    "x402": {
      "command": "npx",
      "args": ["-y", "@codespar/mcp-x402"],
      "env": {
        "X402_API_KEY": "your-key",
        "X402_WALLET_ADDRESS": "your-wallet-address"
      }
    }
  }
}

Claude Code

claude mcp add x402 -- npx @codespar/mcp-x402

Cursor / VS Code

Add to .cursor/mcp.json or .vscode/mcp.json:

{
  "servers": {
    "x402": {
      "command": "npx",
      "args": ["-y", "@codespar/mcp-x402"],
      "env": {
        "X402_API_KEY": "your-key",
        "X402_WALLET_ADDRESS": "your-wallet-address"
      }
    }
  }
}

Tools

| Tool | Description | |------|-------------| | pay_request | Pay for a 402-protected resource and return its content | | verify_payment | Verify if a x402 payment was received and settled on-chain | | create_paywall | Create a x402 paywall configuration for an endpoint | | get_paywall | Get paywall configuration for a URL | | list_paywalls | List all configured paywalls | | delete_paywall | Remove a paywall from an endpoint | | get_balance | Get available USDC balance for x402 payments | | list_payments | List x402 payment history with filters | | get_payment | Get details of a specific x402 payment | | get_supported_networks | List supported blockchain networks and tokens |

Authentication

x402 uses a Bearer API key from a registered facilitator.

Get your credentials

  1. Visit the x402 documentation
  2. Set up a facilitator or use Coinbase's hosted facilitator
  3. Generate an API key
  4. Get your wallet address (Base or Solana)
  5. Set the environment variables

Environment Variables

| Variable | Required | Description | |----------|----------|-------------| | X402_API_KEY | Yes | API key for x402 facilitator | | X402_WALLET_ADDRESS | Yes | Wallet address for sending/receiving payments | | X402_NETWORK | No | Blockchain network: base (default) or solana |

Use Cases

  • Agent accessing premium APIs — AI agent pays per-request for data feeds, LLM APIs, or premium content
  • Micropayment monetization — Protect your API endpoints with sub-cent paywalls
  • Machine-to-machine commerce — Agents autonomously purchasing compute, data, or services

Roadmap

v0.2 (planned)

  • create_subscription — Set up recurring micropayments for an endpoint
  • estimate_cost — Estimate cost before paying for a resource
  • batch_pay — Pay for multiple resources in a single transaction

v0.3 (planned)

  • Multi-token support (ETH, SOL beyond USDC)
  • Streaming payments for long-running agent tasks

Want to contribute? Open a PR or request a tool.

Links

License

MIT