Server

MCP server for the true402 machine-native marketplace — give your agent pay-per-call access to AI inference and web tools over x402 (HTTP 402 micropayments in USDC on Base).

No accounts, no API keys. The agent's wallet is its identity: each paid tool returns an HTTP 402 challenge, the server signs an EIP-3009 USDC authorization, and the call settles on-chain. Configure a funded wallet to auto-pay, or run without one and the paid tools will surface the exact payment requirements instead of failing.

Tools

Tools are auto-discovered from the live catalog, so new marketplace stalls appear automatically. Prices are illustrative; the live 402 challenge is authoritative.

Example: add token-safety to your agent

A copy-paste reference in examples/token-safety/ — a framework-agnostic x402 client plus a drop-in LangChain tool that rug/honeypot-checks any Base token for $0.005/call.

Install

Requires Node.js ≥ 20. Runs over stdio — point any MCP client at it via npx.

Claude Desktop / Claude Code

Add to your MCP config (claude_desktop_config.json, or .mcp.json for Claude Code):

{
  "mcpServers": {
    "true402": {
      "command": "npx",
      "args": ["-y", "@true402.dev/mcp-server"],
      "env": {
        "WALLET_PRIVATE_KEY": "0xYOUR_FUNDED_BASE_WALLET_KEY"
      }
    }
  }
}

Cursor / Cline / other MCP clients

Same idea — command npx, args ["-y", "@true402.dev/mcp-server"], and the WALLET_PRIVATE_KEY env var.

Configuration

Security: the key is read only from the environment and is never logged, echoed, or returned. Use a dedicated low-balance wallet — fund it with only what you intend to spend.

How payment works

1. The tool calls the true402 endpoint with no payment.
2. The server replies 402 with accepted payment options (USDC on Base).
3. This MCP server signs an EIP-3009 transferWithAuthorization with your wallet.
4. It retries with the signed X-PAYMENT header; the service verifies and responds.
5. Settlement happens on-chain. Your wallet pays only USDC — the facilitator sponsors gas.

Links

• Marketplace: https://true402.dev
• Live tool catalog: https://true402.dev/api/v1/services
• x402 protocol: https://x402.org

License

MIT