{"uid":"cap_mOZMCWjutKbo3tFZ-BhBQ","slug":"fetchgate-x402-endpoint-checker-11e006a5","name":"Fetchgate x402 Endpoint Checker","description":"Should an agent pay this x402 endpoint? One live probe of its payment challenge plus its settled-call and unique-payer history, price consistency and domain reputation, returned as ok / caution / avoid with reasons. Use before paying an unfamiliar x402 endpoint.","url":"https://fetchgate.dev/v1/x402/check?utm_source=zero.xyz","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":"The x402 endpoint URL to check."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"url":"https://api.example.com/v1/resource","reasons":["Returns a well-formed x402 challenge."],"verdict":"ok"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_aEpcp3_MpCXRllOqPTkWN","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates whether a given URL is a well-formed, functioning x402 payment-gated endpoint by checking its challenge response.","exampleAgentPrompt":"Can you check whether https://api.example.com/v1/resource is a properly configured x402 endpoint — I want to know if it returns a valid payment challenge before I try paying for it.","exampleUseCases":[{"title":"Pre-payment x402 endpoint sanity check","prompt":"Before my agent tries to pay for data from https://data.myservice.com/v1/report, can you verify it's actually a working x402 endpoint and not misconfigured?"},{"title":"Debugging a broken payment wall","prompt":"My x402-gated API at https://fetchgate.dev/v1/goods/dataset isn't processing payments correctly — can you probe it and tell me whether it's returning a valid x402 challenge?"},{"title":"Auditing third-party x402 API before integration","prompt":"I'm thinking of integrating https://thirdparty.io/api/premium-data into my app — can you check if it's a legitimate x402 endpoint and what reasons it gives for its verdict?"}],"resultDescription":"Returns a JSON object with the checked URL, a verdict ('ok' or failure status), and an array of human-readable reasons explaining why the endpoint does or does not conform to the x402 standard.","failureModes":["URL is not reachable — network error or timeout","Target URL does not return an HTTP 402 response at all — verdict is not 'ok'","Invalid or malformed URL provided in query params","x402 challenge response is present but malformed — reasons array explains specific issues","Method not in allowed enum (GET, HEAD, DELETE) — validation error"],"whenToPreferThis":"Use this endpoint when you need to verify that a specific URL is correctly implementing the x402 micropayment protocol before committing to a payment flow. It is the right choice when debugging x402 integration issues, auditing third-party payment-gated APIs, or pre-checking an endpoint's conformance before building an automated payment agent on top of it.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T18:37:37.887Z","isFirstParty":false,"canonicalSlug":"fetchgate-x402-endpoint-checker-11e006a5"}