{"uid":"cap_aMXIvPvVGJC_DbU6r7vq5","slug":"x402-live-probe-98c74c01","name":"x402 Live Probe","description":"Verify any third-party x402 endpoint is alive and correctly configured\nbefore paying it: a bounded GET/402 preflight fetches the payment contract,\nchecks reachability and response latency, validates accepts, network, price\nand expiry against the x402 spec, and returns a signed observation receipt\nwith an observed_at timestamp you can cite — protection against ghost\nendpoints, dead quotes and wasted USDC.\nLimitation: no payment is made, one endpoint per call, and a passing probe\nproves the contr…","url":"https://api.delx.ai/api/v1/x402/live-probe?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","maxLength":2048,"minLength":12,"description":"Single https x402 endpoint to handshake. One URL per call; no payment is sent."},"capability":{"type":"string","maxLength":120,"minLength":1,"description":"Optional capability tag stored on the observation receipt for later directory queries."}}},"responseSchema":{"type":"json","example":{"url":"https://api.example-x402.test/pay","kind":"x402_live_probe","paid":false,"latency_ms":42,"receipt_id":"0000000000000000000000000000000000000000000000000000000000000000","http_status":402,"observed_at":"2026-08-14T19:00:00+00:00"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2ZZvxNnotUhvUfOBlBCj8","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates and measures a third-party x402 payment endpoint by performing a live GET/402 handshake, checking contract fields, and returning a signed observation receipt — without making any payment.","exampleAgentPrompt":"Before I pay, can you probe the x402 endpoint at https://api.example.com/paid-service to check its payment contract is valid — confirm the price, network, and expiry look right and give me a signed observation receipt?","exampleUseCases":[{"title":"Pre-flight check before paying an agent service","prompt":"I found this x402 API at https://api.someagent.com/summarize — can you probe it before I spend anything? I want to see the price, network, and whether the contract fields are valid, and get a receipt I can log."},{"title":"Auditing a third-party x402 integration","prompt":"We're integrating https://api.partner.com/data-feed which claims to use x402. Can you live-probe it and confirm the payment contract matches the x402 spec — price, accepts, network, and expiry — and return a signed receipt with a timestamp?"},{"title":"Monitoring x402 endpoint health for a marketplace","prompt":"Tag this probe with capability 'weather-feed' and check if https://api.weatherprovider.io/forecast is still reachable and returning a valid x402 payment challenge — I need the latency reading and a signed observation receipt to log in our directory."}],"resultDescription":"A signed observation receipt containing: validation pass/fail status, the observed payment contract details (price, accepted payment methods, network, expiry), measured response latency, and an observed_at timestamp. The receipt is signed so it can be cited as evidence of endpoint state at observation time.","failureModes":["Endpoint is unreachable or times out — probe returns failure with no contract data","Endpoint returns a malformed or non-compliant 402 response — validation fails with field-level errors","URL is not HTTPS or is malformed — rejected before handshake","Endpoint contract fields (price, expiry, network) fail x402 spec validation — returned with specific violation details","Rate limiting or transient network errors — probe may fail intermittently"],"whenToPreferThis":"Use this endpoint when an AI agent needs to verify a third-party x402 endpoint is live and contract-compliant before committing any payment. It is the right choice when you want a timestamped, signed receipt as audit evidence, when you need to check price/network/expiry fields against the x402 spec without side effects, or when building a directory or marketplace that needs to track endpoint health. Prefer this over simply calling the paid endpoint speculatively, as it incurs no payment and produces a citable observation record.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T18:55:45.319Z","isFirstParty":false,"canonicalSlug":"x402-live-probe-98c74c01"}