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Page Change Detection
x402
Page Change Detection is a paid API for AI agents from 6xrkjcfa3yrzvefcpvanurzou4.srv.us, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).
Fetches a public URL and reports whether the page has changed since last check, including a SHA-256 content fingerprint, HTTP metadata, and diff statistics
Price / call$0.01
Success—
StatusUnknown
How this service works
Page change detection - website change monitoring, detect webpage changes, url change detection. Fetches a public URL and reports whether the page changed: the sha256 fingerprint of the text a reader sees, the HTTP status, ETag, Last-Modified and content type, and -- when you send the previous fingerprint as prior_hash -- a changed true or false verdict, the percent changed and the added and removed lines. GET ?url= OR ?prior_hash= OR ?sample=1|2|3 OR POST application/json with...
Output
Returns a SHA-256 fingerprint of the visible text content, the HTTP status code, ETag, Last-Modified header, and content type. When a prior_hash is provided, also returns a boolean 'changed' verdict, the percentage of content that changed, and the specific lines added and removed.
Example use cases
Price page change alert
“Keep an eye on https://competitor.com/pricing for me — here's the fingerprint from yesterday: 'e3b0c44298fc1c149afb'. Tell me if anything changed, what percentage of the page is different, and what lines were added or removed.”
News article update tracking
“Check whether https://reuters.com/article/xyz has been updated since I last saw it — my previous hash was 'a665a45920422f9d417e'. Did the content change, and if so by how much?”
First-time page snapshot
“Fetch https://docs.stripe.com/api/charges and give me a SHA-256 fingerprint of what's on the page right now so I can track future changes to it.”
Technical details
Endpoint
GEThttps://6xrkjcfa3yrzvefcpvanurzou4.srv.us/api/page-change?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need lightweight, recurring checks on whether a specific public URL has changed content, especially when you already have a prior fingerprint to compare against. It is ideal for monitoring landing pages, documentation, pricing pages, or news articles without storing full page snapshots. Prefer it over full-page scrapers when you only need change detection signals (diff percentage, added/removed lines) rather than structured extraction of the new content.
Side effects
- URL is not publicly accessible or returns a non-200 HTTP status — reports the error status
- URL is paywalled or bot-protected — may return incomplete or blocked content fingerprint
- Malformed or invalid URL input — returns a validation error
- Network timeout fetching the target URL — returns a timeout error
- Prior hash format is invalid — may return a comparison error or treat as first fetch
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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