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Sentinel Timer – Scheduled Signed Callback
x402
Sentinel Timer – Scheduled Signed Callback is a paid API for AI agents from sentinel.rootstuff.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Schedules a single signed HTTP POST callback to a specified URL at a chosen future time or after a delay, echoing back a custom JSON payload.
Price / call$0.01
Success—
StatusUnknown
How this service works
Timer: one signed callback at a time you choose
Output
The endpoint confirms the scheduled callback registration. At the specified time or after the delay, Sentinel POSTs the provided JSON payload to the callback_url with a cryptographic signature verifying authenticity. The callback is fired once; no retries beyond what the service guarantees.
Example use cases
Delayed workflow step trigger
“Schedule a callback to https://pipeline.mycompany.com/next-step in exactly 900 seconds with payload {"pipeline_id": "run-42", "step": "transform"} so the next stage kicks off automatically.”
Reminder notification at specific time
“Fire a signed POST to https://reminders.mybot.io/fire at 2025-08-01T09:00:00Z with the payload {"user": "bob", "message": "standup meeting starts now"} — I want Bob's reminder delivered exactly on time.”
Deferred cleanup after task completion
“Set a 7200-second delay before hitting https://cleanup.myservice.com/purge with payload {"session_id": "sess-9981", "reason": "ttl-expired"} so stale session data gets wiped two hours after it's created.”
Technical details
Endpoint
GEThttps://sentinel.rootstuff.io/x402/wakeWhen to prefer
Choose this endpoint when you need a single one-shot future callback with a signed payload and don't want to operate your own job scheduler or cron infrastructure. Ideal for AI agents, serverless functions, or agentic workflows that need to wake up at a precise future moment without polling. The cryptographic signature on the callback makes it suitable when the receiving service needs to verify the trigger is authentic rather than spoofed.
Side effects
- callback_url is a private/reserved address — request refused immediately
- callback_url contains a redirect — redirects are not followed, delivery may fail
- fire_at is more than 7 days in the future — rejected
- delay_seconds is outside the 10–604800 range — rejected
- payload exceeds 4 KB — rejected
- callback_url is unreachable at fire time — delivery failure, no retry guarantee
- neither fire_at nor delay_seconds provided — request rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| fire_at | string | ISO 8601 time to fire, within 7 days. Either this or delay_seconds. |
| payload | object | Up to 4 KB of JSON echoed back in the callback. |
| callback_url | string | Public https URL that receives the POST. Private and reserved addresses are refused; redirects are not followed. |
| delay_seconds | integer | Seconds from now, 10 to 604800. Either this or fire_at. |
Tags
x402
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