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x402.shizu.me Webhook Inbox (Async Callback Bucket)
x402
x402.shizu.me Webhook Inbox (Async Callback Bucket) is a paid API for AI agents from x402.shizu.me, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Mints a durable public capture URL for receiving async callbacks, form posts, or service results, then drains queued deliveries on demand — no server required.
Price / call$0.003
Success—
StatusUnknown
How this service works
A durable inbound URL for agents that can't host a server. POST {ttl?} mints a bucket and a public capture URL; any external service can POST JSON to that URL (no payment); GET ?token= drains the queued deliveries. Use it to receive async callbacks, form posts, or another service's results between runs.
Output
On POST (mint): returns a bucket ID and a public capture URL that third parties can POST JSON to. On GET with ?token=: returns an array of all queued delivery payloads that were posted to the capture URL since the bucket was created or last drained, clearing the queue.
Example use cases
Example prompt
“Create a temporary webhook bucket for me with a 10-minute TTL so I can receive the callback from Stripe after the payment completes, then poll it to drain whatever JSON payloads arrived.”
Technical details
Endpoint
GEThttps://x402.shizu.me/webhookWhen to prefer
Use this endpoint when an AI agent needs to receive asynchronous HTTP callbacks, webhooks, or form posts from external services but cannot host its own server. Ideal for multi-step agent workflows where a third-party service needs to call back with results between agent execution runs. Prefer over polling external APIs directly when you need a push-based delivery model with no infrastructure setup.
Side effects
- Expired TTL — bucket no longer exists, GET returns empty or 404
- Invalid or missing token on GET — unauthorized, deliveries not returned
- Empty queue — no deliveries have arrived yet, returns empty array
- Bucket never created before attempting to drain — token not found
- External service posts malformed JSON — payload may be stored as-is or rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object |
Output
Schema · Response
{
"type": "json",
"example": {
"poll": "GET /webhook?token=AbC123…",
"token": "AbC123…",
"expires": 1784303600,
"capture_url": "https://x402.shizu.me/wh/AbC123…"
}
}Tags
x402
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