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Crier Webhook Delivery
x402
Crier Webhook Delivery is a paid API for AI agents from crier.vimabrosta.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-18).
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.
Price / call$0.005
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Agent notifies order service
“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.”
Cross-agent event handoff
“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.”
Verified callback to partner system
“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.”
Technical details
Endpoint
POSThttps://crier.vimabrosta.com/v1/webhookWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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