x402 Doctor MCP server
online · 100% uptimeIs this x402/MPP API safe to pay? $0.001 preflight, fixes, a $0.25 test purchase. Free quick check.
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If you have run it, two minutes of your experience saves the next person an afternoon.
x402 Doctor tools
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How x402 Doctor compares
Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.
- Safety score
- 91/100
- higher than 85% of 48,255 servers
- Uptime
- 100%
- of our recent checks; the typical remote server answers 100%
- Response time
- 209 ms
- faster than 62% of 30,031 servers
- GitHub stars
- 1
- more than 65% of 28,688 servers
Release history: 4 versions in the registry since 2026-09-25, latest 2026-10-12, typically one every 7 days.
Install x402 Doctor in Claude Code, Cursor or VS Code
claude mcp add --transport http x402-doctor https://x402-doctor.fizzl.eu/mcp
What the publisher says
From the x402 Doctor repository's README, as published. We do not edit it. Read it on GitHub
x402 Doctor
Diagnoses why an x402-payable endpoint's payment flow is broken, without needing a funded wallet.
Paste a URL (web app) or run x402-doctor (CLI, CI) and get back exactly which check failed, why, and how to fix it. Every check traces back to a real bug hit while shipping PlainText and Ichimoku Signal.
▶ Watch the 70-second explainer (with voice and captions): diagnosing a broken endpoint, the pre-payment check for agents, and the daily Trust Index.
▶ New: the paid fix in 70 seconds: for $0.05 the Doctor hands you the medicine, the exact code that fixes each problem for your stack, in the browser or as JSON for agents.
What it checks
Statuses: pass, warn (works, but something is off), fail (payments fail or it is not valid x402), info.
Web app
npm install
npm start # http://localhost:3001Reports are shareable: https:///?url=&method=GET runs the diagnosis on load.
API: POST /api/diagnose with { "url": "...", "method": "GET" | "POST" } (method optional) returns { url, method, overall, checks[], challenge }. Rate-limited to 10 diagnoses per minute per IP.
Paid API for agents (x402)
Shortened. The full README is on GitHub.
Nothing above is checked by us. What we check is on the safety report.
x402 Doctor: common questions
- Is x402 Doctor MCP server safe?
- Yes, by our scan: it is graded A (91/100). Read the x402 Doctor safety report
- How do I install x402 Doctor?
- It runs remotely at x402-doctor.fizzl.eu. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
- Does x402 Doctor need an API key?
- Not as far as the registry entry and our scan can tell: no credentials are declared or required.
- Is x402 Doctor maintained?
- The last commit was 39 days ago (2026-09-25). The latest release is v1.0.3.
- Is x402 Doctor up?
- 100% of our last 28 checks got an answer. We check remote servers about four times a day.
- How does x402 Doctor compare with other MCP servers?
- safety score 91/100 (higher than 85% of 48,255 servers); uptime 100% (of our recent checks; the typical remote server answers 100%); response time 209 ms (faster than 62% of 30,031 servers). Full comparison.