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Fresh402 Web Change Monitor
x402
Fresh402 Web Change Monitor is a paid API for AI agents from fresh402.kirilllabs.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Checks whether a web page has materially changed since its last snapshot, filtering out common page noise, and updates the stored snapshot.
Price / call$0.001
Success—
StatusUnknown
How this service works
Detect meaningful content changes in any URL, monitor website and web page changes, check page freshness, filter common boilerplate/noise, and return a change signal for AI agents.
Output
Returns whether the target web page has materially changed since its previous Fresh402 snapshot, with noise (dynamic elements like timestamps, ads, session tokens) filtered out. The snapshot is updated on each call so subsequent checks compare against the latest version.
Example use cases
Competitor pricing page tracker
“Keep an eye on https://competitor.com/pricing for me — check if the actual pricing content has changed since the last snapshot, filtering out any noise like timestamps or rotating banners.”
News article update detection
“Has the article at https://news-site.com/story/breaking-update been meaningfully updated since you last checked it? Ignore minor stuff like ad changes and just tell me if the real content shifted.”
Government regulation page monitoring
“Check whether https://agency.gov/regulations/new-rules has had any material changes to its content since the last Fresh402 snapshot — I need to know if the actual regulatory text has been updated.”
Technical details
Endpoint
POSThttps://fresh402.kirilllabs.workers.dev/v1/check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to detect meaningful content changes on a web page over repeated visits while suppressing common dynamic noise (timestamps, ads, session data). It is ideal for monitoring competitor pages, regulatory publications, news articles, or any URL where you care about substantive content updates rather than cosmetic or technical churn. Prefer it over generic scraping tools when you want built-in change-diffing with snapshot management rather than raw HTML retrieval.
Side effects
- URL is unreachable or returns a non-200 status — endpoint may return an error or indicate the page could not be fetched
- First call for a URL has no prior snapshot to compare against — may return a baseline-established response rather than a change signal
- Page blocks automated access (bot detection, CAPTCHA) — content may be unavailable for comparison
- Network timeouts for slow-loading pages
- Overly aggressive noise filtering may miss subtle but meaningful changes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Absolute HTTP or HTTPS URL to monitor. Send the same URL again to detect meaningful page changes since the previous Fresh402 snapshot. |
Tags
x402
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