{"uid":"cap_QI9fPYyaKMSAaprWIoSH1","slug":"crier-webhook-delivery-2f360ace","name":"Crier Webhook Delivery","description":"Deliver a signed webhook from an AI agent to a public URL: JSON or text body up to 16KB, POST or PUT, optional custom X- headers. Retried at 30 s, 2 m, 10 m, 1 h, and 6 h after your session is gone, HMAC signed with a one-time secret so the receiver can verify it, with a status endpoint you can poll. One-time $0.005, no account needed.","url":"https://crier.vimabrosta.com/v1/webhook","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","required":["url","body"],"properties":{"url":{"type":"string","format":"uri","description":"Public http(s) receiver."},"body":{"description":"A JSON value (sent as application/json) or a string (sent as text/plain unless content_type says otherwise). 16KB max."},"method":{"enum":["POST","PUT"],"type":"string","default":"POST"},"headers":{"type":"object","description":"Up to 5 custom headers; names must start with X- and not X-Crier-."},"content_type":{"type":"string"}}},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"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":"0.005","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_aiXinu8-HAy8duxhjZSK7","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":"Delivers a signed, retried HTTP webhook from an AI agent to any public URL, with HMAC verification and a pollable status endpoint, for a flat $0.005 fee.","exampleAgentPrompt":"Send a signed webhook with this JSON payload to https://hooks.myapp.com/orders/new using POST — I need it retried automatically if the server is down, and I want to be able to check delivery status afterward.","exampleUseCases":[{"title":"Agent notifies order service","prompt":"After the order is processed, send this JSON — {orderId: '9182', status: 'confirmed', total: 49.99} — as a signed webhook POST to https://hooks.mystore.com/orders so my backend can update its records, and retry if it doesn't go through right away."},{"title":"Cross-agent event handoff","prompt":"Signal the downstream agent by posting this JSON payload — {event: 'analysis_complete', runId: 'abc123'} — to https://agents.myplatform.com/trigger/run via a signed POST, so it knows to start the next step even after my session ends."},{"title":"Verified callback to partner system","prompt":"Send a signed HTTP POST with this payload — {invoice: 'INV-2041', paid: true, amount: 200} — to https://partner.acme.com/webhooks/payments, using the X-Client-Id header set to 'myapp-001', so they can verify it came from us and update the invoice."}],"resultDescription":"Returns a delivery job ID and a status URL you can poll to check whether the webhook was successfully delivered. The payload is HMAC-signed with a one-time secret so the receiver can verify authenticity. If delivery fails, the system retries at 30 seconds, 2 minutes, 10 minutes, 1 hour, and 6 hours after the agent session ends.","failureModes":["Receiver URL is not publicly reachable — delivery fails after all retries are exhausted","Body exceeds 16KB limit — request rejected","Custom header names do not start with X- or start with X-Crier- — request rejected","Invalid URL format provided — request rejected immediately","More than 5 custom headers provided — request rejected","Receiver returns non-2xx on every retry attempt — final delivery failure recorded in status endpoint"],"whenToPreferThis":"Choose this endpoint when an AI agent needs to reliably notify an external HTTP endpoint — especially after the agent session may have ended — with built-in retry logic and HMAC signature verification. It's ideal over a raw HTTP POST when delivery reliability, tamper-evidence, and asynchronous status checking matter, and when you don't want to manage retry infrastructure yourself. The flat $0.005 one-time fee with no account setup makes it suited for lightweight, fire-and-forget agent workflows.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-18T06:40:57.017Z","isFirstParty":false}