x402 Doctor
by FastDrop
Diagnose x402 seller endpoints: what is wrong with your 402 challenge, and how to fix it.
Diagnose x402 seller endpoints: what is wrong with your 402 challenge, and how to fix it. Official MCP Registry: com.twelvepermissions/x402-doctor@1.0.0. Remote endpoint: https://x402-doctor.tsharpe.workers.dev/mcp
Problem it solves
Discoverable MCP server listed in the official MCP Registry.
How it's different
Remote MCP endpoint ingested from the official registry and probed by FastDrop.
Ingested from the official MCP Registry
FastDrop pulled this entry from the official MCP Registry as com.twelvepermissions/x402-doctor and probed the endpoint. The maker did not submit it, so the outbound link is not endorsed
and the description is not theirs.
If this is your server, claim the listing to edit it and take ownership. The registry index lists everything else still awaiting a probe.
Claim this listingTools this endpoint exposes
Read directly from the endpoint on 16 Oct 2026. Not supplied by the maker.
probe_x402_endpointProbe 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 fi
explain_defectFull 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_checksThe whole rule table. Knowing what was NOT checked is part of knowing what a clean result means.
Is this tool yours?
Claim this listing and we’ll verify ownership before handing it over.
Sign in to claim this listingSimilar launches
Matched on shared tags and the tools their MCP servers actually expose.
Shares tags: MCP server
Shares tags: MCP server
Shares tags: MCP server
Shares tags: MCP server
Shares tags: MCP server
Shares tags: MCP server
Reviews
Sign in to leave a review.
No reviews yet.
Comments
Sign in to join the discussion.
No comments yet - start the discussion.