{"uid":"cap_aZP3ZmJPPy5HthhSCMDit","slug":"preflight-checker-x402-service-auditor-18c96b70","name":"PreFlight Checker – x402 Service Auditor","description":"Audits another x402 service for the exact failure modes that cause aggregators (agent-tools.cloud, x402scan, Bazaar) to mark it 'down' or make its 402 challenge unreadable: missing/invalid /.well-known/x402 descriptor, an unpaid request returning 500/404 instead of a clean 402, a malformed or missing payment-required challenge, and drift between the descriptor's advertised terms and the live challenge. Returns a concrete diagnosis and fix for each failing check, not just pass/fail.","url":"https://x402-api-catalog.onrender.com/api/x402-doctor","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["url"],"properties":{"url":{"type":"string","description":"base URL of the x402 service to audit"},"path":{"type":"string","description":"a specific paid endpoint path to probe; omit to auto-discover from the service's /.well-known/x402"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"url":{"type":"string"},"score":{"type":"number"},"verdict":{"type":"string"}}}}}}},"responseSchema":{"type":"json","example":{"url":"https://example-service.onrender.com","fixes":[],"score":40,"checks":[],"verdict":"broken: aggregators will show this as down"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"1","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_BngdPFleXqqV2MEiWBSKx","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Audits an x402-enabled API endpoint for the specific failure modes that cause aggregators to mark it as down or its 402 challenge as unreadable, returning concrete diagnoses and fixes.","exampleAgentPrompt":"Can you audit my x402 service at https://my-api.example.com and tell me exactly why it keeps showing as down on Bazaar and x402scan — specifically check the /.well-known/x402 descriptor and whether the live 402 challenge matches what's advertised?","exampleUseCases":[{"title":"Debug x402 service marked down","prompt":"My x402 API at https://my-payments-api.com keeps getting flagged as down on agent-tools.cloud — can you audit it and tell me exactly what's broken and how to fix it?"},{"title":"Validate 402 challenge before launch","prompt":"Before I list my new paid endpoint at https://api.mybiz.com/premium on Bazaar, can you check that it returns a proper 402 challenge and that my /.well-known/x402 descriptor is valid and consistent with it?"},{"title":"Fix descriptor and live challenge drift","prompt":"My x402 service at https://data-api.io is live but aggregators say the payment terms don't match — can you probe the specific path /api/data and diagnose whether the descriptor is drifting from the actual 402 response?"}],"resultDescription":"Returns an audit report with a numeric score, an overall verdict, and per-check diagnoses covering: /.well-known/x402 descriptor presence and validity, whether unpaid requests return a clean 402 (not 500/404), whether the payment-required challenge is well-formed, and whether the descriptor's advertised terms match the live challenge — each with a concrete fix recommendation.","failureModes":["Target URL is unreachable or times out — returns error indicating the service could not be probed","Target service returns an unexpected response format that prevents analysis","Missing required 'url' query parameter — returns 400 validation error","Audited service has no x402 infrastructure at all — returns low score with full diagnostic breakdown","Rate limit or payment failure for the $1 USDC per call fee"],"whenToPreferThis":"Choose this endpoint when you need to understand specifically why an x402-enabled API is being flagged as down or broken by aggregators like agent-tools.cloud, x402scan, or Bazaar. It is purpose-built for the x402 payment protocol and goes beyond simple uptime checks by diagnosing descriptor validity, challenge format, and drift between advertised and live payment terms — making it the right tool for developers debugging x402 integration issues rather than general API health monitoring.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:38:38.440Z","isFirstParty":false}