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x402 Doctor
io.github.Fizzl13/x402-doctor in the official MCP registry.
Endpoint https://x402-doctor.fizzl.eu/mcp. Source: github.com/Fizzl13/x402-doctor.
The registry describes it as: Is this x402/MPP API safe to pay? $0.001 preflight, fixes, a $0.25 test purchase. Free quick check.
We read its 13 tools on 2026-10-22. Nothing in them matched our tool-poisoning rules.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
x402_quick_check check_payment_proof x402_trust_record x402_trust_add verify_receipt x402_diagnose x402_preflight x402_fix x402_preflight_batch x402_preflight_deep x402_delivery_check x402_delivery_status feedback
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-github-fizzl13-x402-doctor)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.
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