{"uid":"cap_yuW1ZYeBOFLoofVS9xeQj","slug":"saylor-innovations-x402-endpoint-validator-8d1700d4","name":"Saylor Innovations x402 Endpoint Validator","description":"x402 endpoint validator - checks a URL returns a well-formed 402 challenge with valid accepts per network","url":"https://saylorinnovations.com/api/x402check/verify?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","queryParams"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","POST","PUT","PATCH","DELETE","HEAD"],"type":"string"},"queryParams":{"type":"object","required":["url"],"properties":{"url":{"type":"string","description":"the x402 resource URL to check (query)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object","required":["found"],"properties":{"url":{"type":["string","null"],"description":"Canonical URL"},"note":{"type":["string","null"],"description":"Caveat or context for reading the result"},"found":{"type":"boolean","description":"True when the lookup matched a record"},"checks":{"type":"object","description":"Individual check results"},"issues":{"type":"array","items":{"type":"string"},"description":"Issues found"},"checked_at":{"type":["string","null"],"description":"Time the check was run (UTC)"},"latency_ms":{"type":["number","null"],"description":"Response time in milliseconds"},"http_status":{"type":["number","null"],"description":"HTTP status code returned"},"service_name":{"type":["string","null"],"description":"Service name"},"x402_compliant":{"type":["boolean","null"],"description":"X402 compliant"},"accepted_networks":{"type":["array","null"],"description":"Accepted networks"}}}}}}},"responseSchema":null,"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_pe7Fytyg6CXk1Pp3WDPad","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":"Checks whether a given URL correctly returns a well-formed HTTP 402 payment-required challenge with valid network accepts per the x402 protocol","exampleAgentPrompt":"Can you check whether https://example.com/api/my-paid-resource is a properly configured x402 endpoint — does it return a valid 402 payment challenge with accepted networks?","exampleUseCases":[{"title":"Pre-launch x402 compliance check","prompt":"I just built a paid API at https://myapp.com/api/premium-data and want to make sure it returns a proper x402 402 challenge before I list it publicly — can you verify it's compliant and show me any issues?"},{"title":"Debugging broken payment gate","prompt":"My x402-gated endpoint at https://api.myservice.io/data/feed isn't being paid by agents correctly — can you run a compliance check on it and tell me what's wrong with the 402 response it returns?"},{"title":"Auditing accepted networks on an endpoint","prompt":"Can you check what blockchain networks are listed as accepted in the 402 challenge from https://partner.example.com/api/report — I need to confirm it includes Polygon before we integrate with it?"}],"resultDescription":"Returns a JSON object indicating whether the target URL is x402-compliant, including: a boolean found/compliant flag, HTTP status code returned, list of accepted blockchain networks, granular per-check results, any compliance issues found, response latency in milliseconds, the canonical URL checked, and the UTC timestamp of the check.","failureModes":["Target URL is unreachable or times out — found: false with latency_ms null","Target URL returns 200 or other non-402 status — x402_compliant: false with issues listing unexpected status","402 response is malformed or missing required fields — x402_compliant: false with detailed issues array","No accepted_networks listed in the 402 response — issues flag missing network definitions","Missing required query parameter 'url' — likely a 400 or validation error","Rate limiting or cost — each call costs $0.01 USDC via x402"],"whenToPreferThis":"Use this endpoint when you need to programmatically verify that a URL correctly implements the x402 payment protocol — especially before listing an endpoint in a marketplace, integrating a third-party x402-gated API, or debugging 402 challenge formatting issues. It is specifically designed to surface x402 protocol compliance rather than general HTTP health or uptime.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T19:08:39.549Z","isFirstParty":false,"canonicalSlug":"saylor-innovations-x402-endpoint-validator-8d1700d4"}