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x402 Money Farm: Page Fingerprint / Change Detection
x402
x402 Money Farm: Page Fingerprint / Change Detection is a paid API for AI agents from x402-money-farm.fly.dev, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-30).
Generates a noise-normalised structural fingerprint of a web page and compares it against a previous digest to detect whether the page content has meaningfully changed.
Price / call$0.015
Success—
StatusUnknown
How this service works
Page Fingerprint / Change Detection — Stable content + structure fingerprint of a page, noise-normalised, with a change verdict against a caller-supplied previous digest or the last digest this payer saw.
Output
Returns a stable content-and-structure fingerprint (digest) of the requested page, normalised to filter out noise such as timestamps or counters. Includes a boolean change verdict comparing the current fingerprint to either the caller-supplied previous digest or the last digest recorded for this payer, plus a similarity score used against the configured threshold.
Example use cases
Price page change alert
“Has the pricing page at https://acme.com/pricing changed since yesterday? Use my previous digest 'd4f9e2b1' and flag it if anything meaningful shifted.”
News article update monitor
“Fingerprint https://reuters.com/article/some-story and tell me if the body text has changed compared to digest 'prev_digest_001' — ignore any numeric changes like view counts.”
Competitor product page tracker
“Check if https://competitor.com/product/widget looks any different from the last time I saw it — here's my previous digest: 'f8a2c930bb'. Focus only on the #product-description section.”
Technical details
Endpoint
GEThttps://x402-money-farm.fly.dev/v1/fingerprint?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to detect whether a specific web page has meaningfully changed over time, especially when you want noise-normalised comparison (ignoring timestamps, counters, etc.) rather than a raw byte diff. Ideal for monitoring competitor pages, content update alerts, or caching decisions. Prefer over generic HTTP fetchers when a structured change verdict and persistent digest history per payer are needed. Use the CSS selector option to scope monitoring to a specific page section.
Side effects
- Target URL is unreachable or returns non-200 status — error or empty response
- Invalid or malformed URL in query params — validation error
- CSS selector matches nothing on the page — fingerprint may be empty or fall back to full page
- Previous digest is malformed or unrecognised format — comparison skipped or error returned
- Payment not completed — 402 response with payment requirements
- Rate limits or timeouts on the remote page — delayed or failed fetch
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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