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html-fetch-watch
x402
html-fetch-watch is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Monitors a URL for changes in raw HTML content by comparing the current fetch result against the previous cached result, returning a changed flag and diff of modified fields.
Price / call$0.02
Success—
StatusUnknown
How this service works
Change watch for html fetch: runs the check and compares it with the result from your previous call for the same url (kept 90 days), returning the current answer, changed true/false, exactly which fields changed with before/after values, and when it was last seen. Call it on a schedule to be told when raw html fetch changes. $0.01 per check.
Output
Returns the current raw HTML fetch result, a boolean 'changed' flag indicating whether the content differs from the previous call for the same URL, a list of exactly which fields changed with their before and after values, and a timestamp of when the previous result was last seen. Previous results are retained for 90 days.
Example use cases
Track competitor pricing page updates
“Keep an eye on https://competitor.com/pricing — fetch it with GET and let me know if anything in the raw HTML has changed since last check, and show me exactly what's different.”
Monitor product availability on e-commerce site
“Check https://shop.example.com/product/sneaker-123 right now with GET and compare it to the last time you fetched it — has the HTML changed at all, and what specifically is different?”
Alert on government regulation page changes
“Fetch https://regulations.gov/document/policy-update via GET and tell me whether the raw HTML content has changed since the previous check, including which fields changed and what the before and after values were.”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/watch/page/htmlWhen to prefer
Use this endpoint when you need to detect changes in raw HTML content of a specific URL over time without building your own diffing or storage infrastructure. It is ideal for scheduled monitoring workflows where you want a simple changed/unchanged signal plus a structured diff of what exactly changed. Prefer this over a plain HTML fetch when you need change detection logic built in, and over a full web crawler when you only need to watch a single URL.
Side effects
- URL is unreachable or returns a non-200 status — current fetch may fail or return error state
- No prior cached result exists for the URL (first call) — changed flag may be null or false by default
- Cached result has expired beyond 90 days — comparison baseline is lost
- URL redirects or changes domain — may compare against stale baseline
- Rate limiting or network timeouts on the target URL — fetch may be incomplete
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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