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x402 Doctor

by FastDrop

MCP Verified 3 days ago Registry import free

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.

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Tools this endpoint exposes

Read directly from the endpoint on 16 Oct 2026. Not supplied by the maker.

  • 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 fi

  • 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.

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Matched on shared tags and the tools their MCP servers actually expose.

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