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Scrooge x402 Page Watch
x402
Scrooge x402 Page Watch is a paid API for AI agents from scrooge-x402-tool-mill.vercel.app, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-11).
Register a public URL for hourly content-change monitoring over 7 days, delivering a webhook callback when the page's content hash changes
Price / call$0.1
Success—
StatusUnknown
How this service works
Watch one public page for 7 days. Checks hourly. When the content hash changes, POST {watch_id,url,old_fingerprint,new_fingerprint,changed_at} to your https callback (5s timeout, one retry). POST JSON {"url":"https://example.com","callback_url":"https://example.com/hook"}. Returns {watch_id,url,expires,status_url}. Free status is GET /v1/watch/:id and does not show the callback. At 500 active watches, POST returns 503 before payment. $0.10 USDC on Base (eip155:8453). No API key.
Output
Returns a JSON object with watch_id (unique monitor identifier), url (the watched page), expires (ISO timestamp 7 days out), and status_url (GET endpoint to check monitor status). When the page content hash changes within the monitoring window, a POST is sent to your callback_url containing watch_id, url, old_fingerprint, new_fingerprint, and changed_at.
Example use cases
Competitor pricing page alert
“Watch https://competitor.com/pricing for any changes over the next 7 days and POST to https://myapp.com/webhooks/pricing-alert when the content updates.”
Job listings change detection
“Monitor https://careers.bigcorp.com/jobs for new postings and send a webhook to https://mybot.io/job-hook whenever the page content changes — check it hourly.”
Government regulation update tracker
“Keep an eye on https://regulations.gov/document/12345 and notify https://mylegalapp.com/hooks/reg-watch the moment the page content is different from what it is now.”
Technical details
Endpoint
POSThttps://scrooge-x402-tool-mill.vercel.app/v1/watch?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need passive, long-running (up to 7 days) hourly polling of a single public webpage with webhook-based push notification on change, rather than one-shot fingerprinting. Prefer it over the sibling fingerprint endpoint when you don't want to poll yourself. Best for automation pipelines that react to content changes asynchronously. Not suitable for real-time (sub-minute) monitoring or private/authenticated pages.
Side effects
- 503 returned when 500 active watches are already registered — must wait for capacity
- Callback delivery fails if callback_url is unreachable within 5s timeout (one retry attempted)
- Private or link-local URLs are blocked by SSRF protection and will be rejected
- Monitor expires after 7 days with no renewal — must re-register to continue watching
- Payment of $0.10 USDC on Base (eip155:8453) must succeed before watch is created
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public http(s) URL to fetch (SSRF-safe; private/link-local blocked) |
| callback_url | string | Public https URL that receives one POST when the page content hash changes |
Tags
x402
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