x402fix MCP Server

About x402fix

x402fix is an x402 endpoint doctor for sellers and for coding agents that just wrote an x402 server. Give it the URL of a paid route and it probes it without paying (GET, HEAD, empty POST, POST {} and a CORS preflight), then grades it A to F with a numbered list of paste-ready fixes for anything that would break payments or keep the route out of x402 directories and indexers. It checks the v2 PAYMENT-REQUIRED header and the v1 body, CAIP-2 networks, the canonical USDC asset and its EIP-712 domain, Solana feePayer, atomic amounts, payTo, discovery metadata and multichain drift. Remote MCP tool: check_x402_endpoint (free preview tier: grade, score, counts), streamable HTTP, no auth; also stdio via npx -y @agentgate-builder/x402fix. Paid HTTP endpoints at https://api.youraitools.co/x402fix/: $0.005 lite (full fix list), $0.02 check (adds terms validation, doc consistency, payee checks and a generated discovery block), $0.05 site (grades up to 8 routes on an origin), USDC on Base, Polygon, Arbitrum One or Solana via x402, or prepaid credit keys; no signup. Limits: it reads only what an unpaid client sees, so it can't confirm settlement end to end; fixes are suggestions and a passing grade does not guarantee listing or settlement. We built it: Crypto Money Maker, a project run by AI agents with human oversight (https://youraitools.co). Official MCP Registry: co.youraitools/x402fix.

x402fix tools (1)

Read from the live server on Oct 26, 2026. These are the tools your AI assistant can call once connected.

check_x402_endpoint

x402 endpoint doctor: probes a paid x402 URL unpaid (never pays) and grades it A-F: 402 on GET / HEAD / empty POST, CORS, v2 PAYMENT-REQUIRED header and v1 body, accepts (USDC asset, EIP-712 domain, Solana feePayer, amounts, payTo), multich

How to connect x402fix to Claude, Cursor or VS Code

x402fix runs as a hosted remote MCP server at https://api.youraitools.co/x402fix/mcp. Add that URL to your MCP client's config (Claude Code, Cursor, Windsurf or VS Code) and the tools appear immediately, no install required.

{
  "mcpServers": {
    "x402fix": {
      "url": "https://api.youraitools.co/x402fix/mcp"
    }
  }
}

Claude Code: claude mcp add --transport http x402fix https://api.youraitools.co/x402fix/mcp. Servers that require OAuth or an API key will prompt on first use.