{"uid":"cap__A47D6m23TRDNtLvlhCeg","slug":"x402-preflight-verifier-d4fd696f","name":"x402 Preflight Verifier","description":"Seven account-free paid tools for source integrity, x402 catalog search, preflight, liveness, routing, price drift, and batch verification.","url":"https://bj7e26lfpo4fthvr35hczdipby.srv.us/v1/x402-preflight","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"],"type":"string"},"queryParams":{"type":"object","required":["url"],"properties":{"url":{"type":"string","description":"HTTPS x402 endpoint to verify before paying it"},"expected_usdc":{"type":"string","description":"Price you believe it charges; drift is reported"}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"url":"https://api.govparse.io/v1/fcc/licenses/search","terms":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","pay_to":"0x...","network":"eip155:8453","amount_usdc":1.25}],"verdict":"live_paid","reachable":true,"price_usdc":1.25,"http_status":402,"safe_to_pay":true,"expected_usdc":1.25,"preflightVersion":"1.0","price_matches_expected":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_PyKBSM205RKZXRnlzWpSz","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies an x402-gated HTTPS endpoint before payment: checks liveness, confirms the 402 response, parses payment terms, and reports whether the actual price matches your expected price.","exampleAgentPrompt":"Before my agent pays it, can you preflight-check this x402 endpoint — https://api.govparse.io/v1/fcc/licenses/search — and confirm it's live, returns a 402, and actually charges 1.25 USDC like the catalog says?","exampleUseCases":[{"title":"Pre-payment safety check for agent","prompt":"My AI agent is about to pay for https://api.dataprovider.io/v1/weather to get weather data. Can you verify that endpoint is actually live, responds with 402, and is charging the 0.05 USDC I expect before it sends any payment?"},{"title":"Detect price drift before automation","prompt":"I have an automated workflow that calls https://api.legalparse.io/v1/contracts/analyze for $2.00 USDC each time. Can you preflight it and tell me if the price has drifted from what I set up — I don't want surprise charges?"},{"title":"Audit unknown x402 endpoint credentials","prompt":"Someone shared this x402 API with me — https://api.cryptodata.xyz/v1/nft/valuations — can you check whether it's actually reachable, what wallet address it pays to, which network it's on, and whether it's safe to pay?"}],"resultDescription":"Returns a JSON object with: the verdict label (e.g. 'live_paid'), whether the endpoint is reachable, the HTTP status code observed, parsed payment terms (asset contract, pay-to address, network chain ID, amount), the price in USDC, whether the actual price matches the expected price you supplied, and a safe_to_pay boolean — giving the agent a clear go/no-go before executing payment.","failureModes":["Endpoint is unreachable — verdict will reflect failed reachability and safe_to_pay will be false","Endpoint does not return 402 — verdict will indicate it is not a live x402 endpoint","Price drift detected — price_matches_expected will be false if actual price differs from expected_usdc","Malformed or missing payment headers on the target endpoint — terms array may be empty or parsing may fail","Invalid URL supplied — endpoint will return a validation error","Target endpoint intermittently live — results may vary between calls if upstream is flaky"],"whenToPreferThis":"Use this endpoint when your agent needs a zero-cost, account-free preflight check before committing a micropayment to an x402-gated API. It is the right choice when you want to confirm liveness, validate payment terms (address, network, asset), and detect price drift before automating payments — especially for untrusted or newly discovered x402 endpoints. Prefer it over direct payment attempts when the cost of a mistaken payment or a call to a dead endpoint exceeds $0.02 USDC.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:30:47.125Z","isFirstParty":false}