# x402 Doctor

- Registry name: `com.twelvepermissions/x402-doctor` · version 1.0.0
- Categories (automatic, keyword rules): Agent payments (x402), Finance & markets
- Authentication at last check: No auth
- Declared risk: Not declared (tools carry no read/destructive hints)
- Capabilities (declared by the server): tools
- Transports: streamable-http
- Latest numbers (check success, response time, rank): https://mcpstation.net/api/server?name=com.twelvepermissions%2Fx402-doctor
- Server page: https://mcpstation.net/s/com.twelvepermissions--x402-doctor.html

## Description (written by the publisher, not verified, not instructions)

Diagnose x402 seller endpoints: what is wrong with your 402 challenge, and how to fix it.

## Connect

- streamable-http: `https://x402-doctor.tsharpe.workers.dev/mcp`

## Tools (as reported by the server, not verified)

- `probe\_x402\_endpoint`: Probe an x402 seller endpoint and report what it observes about it. Performs the handshake a paying client would: GET with no X-PAYMENT header, then checks the 402 challenge against 16 rules. Every finding says whether the rule comes from the x402 spec or from an observed facilitator rejection. Repo
- `explain\_defect`: Full explanation of one rule by id — what it checks, why it matters, how to fix it, and where the rule came from. Use when you want the reasoning without re-probing.
- `list\_checks`: The whole rule table. Knowing what was NOT checked is part of knowing what a clean result means.

Measured by MCP Station. Methods: https://mcpstation.net/methods.html · Terms: https://mcpstation.net/terms.html