{"uid":"cap_Ok5TuZToFLEhTKCtzEK4n","slug":"x-402-webhook-callback-poller-d129f32b","name":"x-402 Webhook Callback Poller","description":"A temporary public webhook URL: give it to any service, then long-poll the events that arrived (method, query, headers, body). Free to receive and read, up to 100 events for 1 to 24…","url":"https://api.x-402.online/v1/callbacks?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"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"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_WfCepD1xlY81WPs7HfmsY","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":"Long-poll a temporary public webhook URL to retrieve HTTP events (method, query, headers, body) that have been delivered to it","exampleAgentPrompt":"Check my temporary webhook at x-402.online and fetch all the HTTP events that have arrived so far — show me the method, headers, and body of each one.","exampleUseCases":[{"title":"Debug third-party callback delivery","prompt":"I gave a payment processor my temporary x-402 webhook URL to test their callback — can you poll it now and show me what they sent, including the headers and body?"},{"title":"Verify webhook trigger from CI pipeline","prompt":"My CI pipeline is supposed to hit my temporary webhook after a build — can you long-poll the x-402 callback endpoint and tell me if any events came in with a GET request?"},{"title":"Inspect OAuth redirect parameters","prompt":"I set up my temporary x-402 webhook as the redirect URI for an OAuth flow — can you fetch all the events that arrived and show me the query parameters they included?"}],"resultDescription":"A list of up to 100 HTTP events received by the temporary webhook URL, each containing the request method, query parameters, headers, and body. Events are returned in arrival order and span up to the last 24 hours of activity.","failureModes":["No events received yet — webhook has not been called by any service","Webhook URL expired (TTL exceeded 24 hours) — no events returned","Event limit of 100 reached — oldest events may have been dropped","Invalid or missing method parameter — request rejected","Polling timeout if no events arrive within the long-poll window"],"whenToPreferThis":"Use this endpoint when you need to inspect what a third-party service sent to a temporary callback URL — ideal for debugging integrations, verifying OAuth redirects, testing webhook delivery, or capturing payloads without standing up your own server. Prefer it over persistent webhook infrastructure when you need a quick, disposable listener with no setup.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-09T18:50:09.647Z","isFirstParty":false,"canonicalSlug":"x-402-webhook-callback-poller-d129f32b"}