{"uid":"cap_njRR6F_g8wtHfTcB4JYzx","slug":"x402-url-liveness-probe-0e9e2b26","name":"x402 URL Liveness Probe","description":"Given any public HTTP(S) URL, returns a measured liveness verdict - LIVE, PAUSED, GATED, CHALLENGED, DEGRADED, DEAD or UNKNOWN - with every reason carrying the source it was read from. The point is the case a status check misses: a front door answering 200 over a back end that stopped. Also sold at this origin: good ($149.00, POST /x402/good) - The x402 rail, ninety days - framed print, 24 x 36 in; census ($100.00, GET /x402/census) - The x402 rail census, ninety days, whole.","url":"https://x402.shortforge.dev/x402/probe?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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"},"headers":{"type":"object","additionalProperties":{"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":"0.01","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_-IHvEoLIRsr2z7izzLEMc","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":"Given a public HTTP(S) URL, returns a structured liveness verdict (LIVE, PAUSED, GATED, CHALLENGED, DEGRADED, DEAD, or UNKNOWN) with sourced reasons explaining the status.","exampleAgentPrompt":"Can you probe https://api.example.com/health with a GET request and tell me whether it's actually live, or just pretending to be up — I want the full verdict with reasons?","exampleUseCases":[{"title":"Third-party API availability check","prompt":"Before my workflow runs, probe https://api.partner.com/v2/data with GET and tell me if it's truly live or just returning a fake 200 — I need to know if the back end is actually responding."},{"title":"Detecting paywalled or gated content","prompt":"Can you check https://premium.news.example.com/article/12345 with a GET request and tell me if it's openly accessible or gated behind a login or paywall?"},{"title":"Monitoring a deployed service for degradation","prompt":"Probe https://myapp.production.example.com/api/status with a HEAD request and give me its liveness verdict — specifically whether it's DEGRADED or fully LIVE right now."}],"resultDescription":"A structured liveness verdict object with one of seven categorical labels (LIVE, PAUSED, GATED, CHALLENGED, DEGRADED, DEAD, UNKNOWN), accompanied by a list of reasons each tagged with the source from which the evidence was read. This goes beyond a simple HTTP status code check by detecting cases where a front-end proxy answers 200 while the back end is non-functional.","failureModes":["Invalid or non-public URL returns an error or UNKNOWN verdict","URL behind a firewall or IP block may return DEAD incorrectly","Very slow endpoints may time out and return DEGRADED or UNKNOWN","Redirecting URLs may require following chains not captured in a single probe","Endpoints requiring POST or non-supported methods cannot be probed (only GET/HEAD/DELETE supported)"],"whenToPreferThis":"Choose this endpoint when you need to go beyond a naive HTTP status check and detect subtle failures like a gateway returning 200 while the upstream service is dead, or when you need a machine-readable categorical verdict with sourced evidence. Ideal for agent workflows that gate on real service availability before making downstream calls, monitoring pipelines, or any situation where a simple ping is insufficient.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T06:36:52.642Z","isFirstParty":false,"canonicalSlug":"x402-url-liveness-probe-0e9e2b26"}