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Sentinel URL Watcher (1-Hour)
x402
Sentinel URL Watcher (1-Hour) is a paid API for AI agents from sentinel.rootstuff.io, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).
Monitors a public URL for 1 hour and sends signed webhook callbacks whenever its reachability or status verdict changes
Price / call$0.05
Success—
StatusUnknown
How this service works
Watch a URL for 1 hour: signed callbacks when its verdict changes
Output
The endpoint registers the watch and then delivers HTTP POST callbacks to the specified callback_url whenever the target URL's verdict (up/down/reachable/unreachable) changes during the 1-hour window. Each callback is cryptographically signed and echoes back the original payload. No polling is required by the caller.
Example use cases
Post-deploy site availability check
“I just deployed a new version of my app to https://staging.myapp.com — watch it for the next hour and hit https://hooks.myapp.com/alerts if its status verdict changes, so I know immediately if something breaks.”
Third-party API dependency alert
“Can you monitor https://api.stripe.com/v1 for one hour and send a signed callback to https://ops.mycompany.com/webhook whenever its verdict flips? Include {"dependency":"stripe","team":"payments"} in the payload.”
Short-term incident response watch
“We're in the middle of an incident — watch https://status.partner-service.com for the next hour and POST to https://my-pagerduty-bridge.com/sentinel whenever the verdict changes, so our on-call engineer gets notified automatically.”
Technical details
Endpoint
GEThttps://sentinel.rootstuff.io/x402/watch-1hWhen to prefer
Choose this endpoint when you need short-term (1-hour) URL monitoring with push-based signed callbacks rather than polling. It is ideal for post-deploy checks, incident response windows, or any situation where you want automatic notification of verdict changes without managing a long-running watcher. Prefer the 24-hour sibling endpoint for longer monitoring needs, or the consensus-check endpoint for a one-shot multi-region availability snapshot instead of ongoing watching.
Side effects
- callback_url is a private or reserved IP address — request is refused
- target URL is not a public host — rejected at registration
- callback_url returns non-2xx repeatedly — retries may be exhausted silently
- payload exceeds 4 KB limit — request rejected
- watch window expires after exactly 1 hour with no further callbacks
- callback_url has redirect chains — not followed, treated as failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | The http(s) URL to watch. Public hosts only. |
| payload | object | Up to 4 KB of JSON echoed back in every callback. |
| callback_url | string | Public https URL that receives the POSTs. Private and reserved addresses are refused; redirects are not followed. |
Tags
x402
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