x402 Doctor

com.twelvepermissions/x402-doctorVersion 1.0.0

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

Status

Responds128 msNov 14, 2026, 14:20 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:20 UTC
Latency: 128 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://x402-doctor.tsharpe.workers.dev/mcpResponds128 msNov 14, 2026, 14:20 UTC

No sign-in

Claude Code

claude mcp add --transport http x402-doctor https://x402-doctor.tsharpe.workers.dev/mcp

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: x402-doctor
Remote MCP server URL: https://x402-doctor.tsharpe.workers.dev/mcp

Cursor

{
  "mcpServers": {
    "x402-doctor": {
      "url": "https://x402-doctor.tsharpe.workers.dev/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"x402-doctor","type":"http","url":"https://x402-doctor.tsharpe.workers.dev/mcp"}'

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Tools

3 tools

Tools of x402 Doctor
	Description		Read-only	Idempotent	Open world
`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.	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.	Not declared	Not declared	Not declared	Not declared
`list_checks`The whole rule table. Knowing what was NOT checked is part of knowing what a clean result means.	The whole rule table. Knowing what was NOT checked is part of knowing what a clean result means.	Not declared	Not declared	Not declared	Not declared
`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. Reports status "healthy" (nothing to report), "advisories" (only warn/info findings — the endpoint works), "defects_found" (at least one error-severity finding), "not_x402" or "unreachable".	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. Reports status "healthy" (nothing to report), "advisories" (only warn/info findings — the endpoint works), "defects_found" (at least one error-severity finding), "not_x402" or "unreachable".	Not declared	Not declared	Not declared	Not declared

Details

Registry status: Active
Published: Aug 17, 2026
Updated: Aug 17, 2026
Website: https://x402-doctor.tsharpe.workers.dev/⁠ (opens in a new tab)
Repository: https://github.com/tsharpe2282-web/twelve-permissions⁠ (opens in a new tab)
Categories (suggested): E-commerceSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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