x402fix MCP

An MCP server that grades x402 endpoints A-F for payment-breaking issues like CORS, headers, and schema mismatches, providing paste-ready fixes and facilitator verdicts for sellers.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Vendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-01Operated by YourAITools

MCP endpoint (Streamable HTTP)

https://api.youraitools.co/x402fix/mcp

Vendor documentation

What you can do with it

Grade x402 endpoints for payment compatibility
Identify CORS and header issues
Generate paste-ready fixes for broken routes
Create Bazaar blocks for listings

Source and maintenance

Vendor evidenceRegistry 0.1.0

mcp-registry: co.youraitools/x402fix@0.1.0 Project website

Protocol and capabilities

Server: x402fix 0.1.0
MCP protocol: 2025-06-18
Tools: 1 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Call check_x402_endpoint with the URL of a paid x402 route after deploying or changing it. Returns a grade and counts; the fix list is on the paid x402 routes.

Tools

1 advertised

check_x402_endpoint — Is my x402 endpoint correct?

Advertised by the server during the last successful anonymous check.

Advertised read-onlyOpen-world

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), multichain consistency and the Bazaar declaration. Free preview tier: grade, score, status and counts. The paid x402 endpoints /v1/lite ($0.005), /v1/check ($0.02, adds the facilitator validate verdict, payee checks and generated fixes) and /v1/site ($0.05, whole origin) return the fix list.

check_x402_endpoint input schema

{
  "type": "object",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "description": "Full https URL of the paid x402 route (site tier: the origin or API base URL)"
    },
    "method": {
      "enum": [
        "GET",
        "POST"
      ],
      "type": "string",
      "description": "Method your paid route uses (default: from its Bazaar declaration, else GET)"
    }
  }
}

check_x402_endpoint annotations

{
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 491 ms
95th percentile latency: 491 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 1, 2026, 7:04 AM UTC · probe · passed · 491 ms · metadata changed · 1 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http x402fix-mcp https://api.youraitools.co/x402fix/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add x402fix-mcp --url https://api.youraitools.co/x402fix/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable x402fix-mcp in your MCP settings.

Cursor configuration

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

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "x402fix-mcp": {
      "type": "streamableHttp",
      "url": "https://api.youraitools.co/x402fix/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start x402fix-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "x402fix-mcp": {
      "type": "http",
      "url": "https://api.youraitools.co/x402fix/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http x402fix-mcp https://api.youraitools.co/x402fix/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

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

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

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

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