{"uid":"cap_HSuipgPZ_r8Y_vVgYeN8Y","slug":"x402check-conformance-pre-flight-check-102c3133","name":"x402check Conformance Pre-flight Check","description":"Live x402 conformance pre-flight check: pass ?url=<x402 endpoint>, get a structured PASS/WARN/FAIL verdict on its 402 challenge before you trust it with a real payment.","url":"https://x402check.arden-instance.workers.dev/check","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"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_6pbl-UbDRYS6A6pnL8EOj","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","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 x402-enabled endpoint correctly implements the 402 payment challenge protocol before committing a real payment.","exampleAgentPrompt":"Before I start paying for calls to https://api.example.com/data, can you run a conformance pre-flight check on it to see if it gets a PASS, WARN, or FAIL verdict for its x402 implementation?","exampleUseCases":[{"title":"Pre-integration x402 API vetting","prompt":"I'm about to integrate https://market-data.example.com/prices into my trading bot — can you check whether its x402 payment challenge actually conforms to spec before I wire up real USDC payments?"},{"title":"Debugging a broken x402 endpoint","prompt":"My agent keeps failing to pay for calls to https://ai-tools.example.com/summarize — can you run a conformance check on that URL to see if the 402 challenge itself is the problem?"},{"title":"Auditing third-party x402 service","prompt":"I found a new x402 API at https://weather-paid.example.com/forecast and want to know if it's trustworthy — run a pre-flight check and tell me if it passes, warns, or fails the x402 conformance test."}],"resultDescription":"A structured verdict object with a PASS, WARN, or FAIL status indicating whether the target endpoint correctly implements the x402 402-payment challenge protocol, along with details about what aspects of the conformance check passed or failed.","failureModes":["Target URL is unreachable or times out — check will fail with a connectivity error","Target URL does not return a 402 status at all — likely a FAIL verdict","Malformed or missing ?url= query parameter — request rejected","Target endpoint is not an x402 service — verdict will be FAIL","Network errors from the Cloudflare Worker reaching the target URL"],"whenToPreferThis":"Use this endpoint whenever you need to verify that an x402-gated API is correctly implementing the payment protocol before committing real USDC payments. It is ideal for pre-integration vetting, debugging payment failures, or auditing third-party x402 services. Prefer this over manually inspecting 402 responses when you need a structured, automated verdict.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:37:23.307Z","isFirstParty":false}