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Website Change Evidence – Compare Live
x402
Website Change Evidence – Compare Live is a paid API for AI agents from website-change-evidence.inboxtzdjqv.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-21).
Fetches a live public webpage, computes citation-grade metadata and content hashes, and deterministically detects changes against a previously captured baseline snapshot.
Price / call$0.003
Success—
StatusUnknown
How this service works
Read public webpages, capture citation-grade metadata and hashes, and detect live page changes deterministically.
Output
Returns a structured object indicating whether the live page differs from the baseline snapshot, including content hashes for both versions, citation-grade metadata (title, fetch timestamp, canonical URL), a list of which target phrases were found or missing, and a deterministic change flag with diff details.
Example use cases
Legal evidence of webpage content
“I need citation-grade proof that this terms-of-service page at https://example.com/terms said 'no arbitration clause' as of today — fetch it live, hash it, and compare it against the baseline snapshot I saved last week so I can show whether anything changed.”
Price monitoring for e-commerce
“Check the product listing at https://shop.example.com/item/123 right now and compare it against this baseline snapshot — flag whether the phrase '$49.99' is still on the page or if the price has changed.”
Regulatory compliance page audit
“Fetch the live FDA guidance page at https://fda.gov/guidance/xyz and run it against this saved baseline to detect any content changes, especially look for whether the phrase 'effective date 2024-01-01' is still present.”
Technical details
Endpoint
POSThttps://website-change-evidence.inboxtzdjqv.workers.dev/v1/compare-live?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need deterministic, citation-grade evidence of whether a specific public webpage has changed relative to a known prior state — especially for legal, compliance, or audit contexts where a cryptographic hash and metadata trail matter. Prefer it over generic scraping when you need both a live fetch AND a structured diff against a baseline in a single call, or when you need to assert the presence of specific phrases as part of the verification.
Side effects
- URL is behind authentication or paywalled — returns fetch error or empty content
- Target URL returns non-200 status (404, 503) — change cannot be determined
- Baseline 'before' object is malformed or missing required fields — validation error
- Page uses heavy JavaScript rendering that the fetcher cannot execute — returns raw HTML without rendered content
- Network timeout fetching the live URL — returns timeout error
- Phrases array contains regex or unsupported syntax — match fails silently or errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string | |
| beforerequired | object | |
| phrases | array |
Tags
x402
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