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payperwork Box Key Wait (Long-Poll)
x402
payperwork Box Key Wait (Long-Poll) is a paid API for AI agents from payperwork.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-11-02).
Long-polls until a specific key in a named box has been updated (seq > since), returning the new item or a timeout signal after up to 25 seconds.
Price / call$0.001
Success—
StatusUnknown
How this service works
Block until {key} in box {box} has a seq greater than since (query since=, default 0), up to timeout= seconds (max 25). Returns the item, or {"value":null,"timed_out":true}.
Output
Returns a JSON object containing the current value of the key and its sequence number if an update occurred within the timeout window, or {"value":null,"timed_out":true} if no update arrived in time.
Example use cases
Agent-to-agent result handoff
“Block and wait for the key 'image-ready' in box 'pipeline-jobs' to update past sequence 3 — give me up to 15 seconds before timing out.”
Human approval gate in workflow
“Wait for the key 'approval' in box 'order-review' to get a new value after sequence 0, holding for up to 25 seconds so I can see the human's decision.”
Async task completion check
“Poll the key 'report-output' in box 'analytics-tasks' until its sequence is greater than 2, waiting at most 10 seconds, then give me the result.”
Technical details
Endpoint
GEThttps://payperwork.app/box/:box/:key/wait?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to synchronize with another process or agent by waiting for a shared key to be written or updated — ideal for event-driven workflows, human-in-the-loop approval gates, or inter-agent result passing where a push/subscribe mechanism isn't available. It is preferable to busy-polling because it holds the connection open server-side and only returns when data is ready or the timeout expires.
Side effects
- Timeout reached before key updates — returns {"value":null,"timed_out":true}
- Invalid or nonexistent box/key combination — may return null value immediately
- timeout parameter exceeds server maximum of 25 seconds — clamped or rejected
- Missing required path parameters (box or key) — HTTP 400 or 404
- Payment failure via x402 protocol — HTTP 402 response before data is returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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