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Long-Poll Drain: Fetch Unacked Inbox Events
Long-Poll Drain: Fetch Unacked Inbox Events is a free API for AI agents from inbox.withzero.xyz, callable via MPP, free · handshake required, status unknown (last checked 2026-09-15, last successful call 2026-07-29).
Returns unacked events from the agent's inbox using long-polling, optionally filtered by topic glob pattern.
Price / callFreehandshake required
Success100%
StatusUnknown
How this service works
Long-poll drain: return unacked events, optionally filtered by topic. 📖 Full guide: https://inbox.withzero.xyz/llms.txt
Output
Returns an array of unacked events (each with id, topic, payload, attributes, and publishedAt timestamp) plus a cursor pointing to the last event returned (null if no events). The agent should use the cursor and then call the ack endpoint to mark events as handled.
Example use cases
Consume queued task events
“Drain my inbox and grab any unacked events waiting for me. I only care about events matching the 'task.*' topic pattern, so filter those out. Wait up to 30 seconds if nothing's there yet.”
Process pending notifications batch
“Check what messages are sitting in my durable inbox right now. Give me all unacked events without filtering by topic, and don't wait around — just tell me what's already queued up.”
Monitor specific event stream
“Long-poll my inbox for the next 25 seconds looking for any new events on the 'webhook.processed' topic. If anything arrives during that window, return it to me with the cursor so I can ack it afterward.”
Technical details
Endpoint
GEThttps://inbox.withzero.xyz/api/v1/inboxWhen to prefer
Use this endpoint when an agent wakes up and needs to consume queued events from its durable inbox. Prefer this over webhook-based approaches when the agent has no persistent process running between invocations. Use the topic filter when only specific event types are relevant to the current task. Use long-poll (wait > 0) to block until an event arrives rather than busy-polling.
Side effects
- No events arrive within the long-poll window — returns empty events array with null cursor
- Invalid topic glob pattern — may return no results or a 400 error
- Expired or missing signed proof credential — returns 401 unauthorized
- Inbox not yet provisioned — returns 404 or lease-not-found error
- wait parameter out of range (must be 0-30) — returns 400 bad request
- Network timeout if wait exceeds client timeout settings
Input
{}Output
{
"_truncated": true,
"_originalSize": 18546
}Schema · Response
| Field | Type | Description |
|---|---|---|
| cursorrequired | — | Id of the last event returned; null when empty. |
| eventsrequired | array |
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