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Website Changes Detector
x402
Website Changes Detector is a paid API for AI agents from agent.chiemgaufilms.com, paid per call via x402, $0.025/call, status unknown (last checked 2026-10-29).
Fetches a single webpage, extracts its main-topic text, and compares it line-by-line against a caller-supplied previous snapshot to report added and removed lines.
Price / call$0.025
Success—
StatusUnknown
How this service works
Fetch one page once and compare its bounded main-topic text with a caller-supplied previous snapshot for the same URL. Reports added/removed lines. No scheduler, screenshots or whole-site crawl; no semantic price interpretation.
Output
Returns a structured diff of the webpage's main-topic text versus the supplied previous snapshot, listing lines that were added and lines that were removed. No screenshots, no scheduled polling, and no semantic interpretation of the changes (e.g. no price parsing) — just raw line-level additions and deletions.
Example use cases
Track competitor pricing page updates
“Has anything changed on https://competitor.com/pricing since last week? Here's what the page said before: 'Starter plan: $9/month. Pro plan: $29/month.' Tell me what's been added or removed.”
Monitor product availability announcement
“Check https://store.example.com/product/limited-edition right now and compare it to this snapshot I saved: 'Currently out of stock. Join the waitlist.' Let me know if any lines changed — I'm watching for a restock notice.”
Detect blog post edits after publishing
“I want to know if https://myblog.example.com/post/2024/launch-recap has been edited since I last read it. The text I captured was: 'We launched on January 10th with 200 users. The first week went smoothly.' What lines are different now?”
Technical details
Endpoint
POSThttps://agent.chiemgaufilms.com/api/v1/website-changes?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a one-shot, lightweight comparison of a single webpage's current text against a known previous state you already have stored. It is ideal for agent workflows that maintain their own snapshots and want to detect textual changes without setting up a scheduler or crawling multiple pages. Prefer it over full-site monitoring tools when you only care about line-level text diffs of a bounded content area, and you do not need screenshots, semantic interpretation, or automatic periodic polling.
Side effects
- URL is unreachable or returns a non-200 status — endpoint may return an error or empty diff
- Previous snapshot text exceeds 12,000 character limit — request will be rejected
- URL string exceeds 2,000 character limit — request will be rejected
- Page has no extractable main-topic text (e.g. fully JavaScript-rendered with no SSR) — diff may be empty or inaccurate
- Snapshot URL and current URL mismatch may produce misleading diffs if content is unrelated
- Network timeout fetching the target page — transient failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | |
| previous | object |
Tags
x402
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