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Agent Market Lab Website Change Check
x402
Agent Market Lab Website Change Check is a paid API for AI agents from agent-market-lab.fidelly.eu, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-12).
Snapshots a public URL and compares it to a previous baseline snapshot to detect whether the page content has changed.
Price / call$0.1
Success—
StatusUnknown
How this service works
Pay-per-call public-web extraction, ecommerce data including a 10-product batch, change detection and website business research for autonomous agents via x402 on Base.
Output
Returns a JSON object with a boolean 'changed' flag, a content hash of the current page, the new snapshot ID, a creation timestamp, optional diff details in 'changes', and the baseline snapshot metadata for comparison.
Example use cases
Competitor pricing page tracker
“Keep an eye on https://competitor.com/pricing — has anything on that page changed since my last snapshot (baseline ID a1b2c3d4-0000-0000-0000-000000000001)? Show me what's different.”
Product availability monitoring
“Check https://shop.example.com/product/limited-edition-sneaker right now and compare it to my stored snapshot b9e8f7a6-1111-2222-3333-444455556666 — I want to know if the stock status or price has changed.”
News article edit detection
“I saved a snapshot of this article last week — can you check https://news.example.com/article/story-123 against baseline ID d4e5f6a7-aaaa-bbbb-cccc-ddddeeee0000 to see if the text has been quietly updated or corrected?”
Technical details
Endpoint
POSThttps://agent-market-lab.fidelly.eu/v1/website-change-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need lightweight, pay-per-call website change detection without committing to a subscription monitoring service. Ideal for autonomous agents that need to check a specific URL on demand, compare against a stored baseline, and get a clear changed/unchanged signal with a content hash. Prefer this over full web-scraping endpoints when your goal is purely detecting mutations rather than extracting structured data.
Side effects
- URL is not publicly reachable (returns error or empty snapshot)
- Invalid or mismatched baselineId UUID causes comparison failure
- Dynamically rendered JavaScript pages may yield unreliable content hashes
- Rate limiting or payment failure via x402 blocks the request
- URL exceeds 2048-character limit returns validation error
- Paywalled or bot-protected pages may return blocked/empty content
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Absolute public HTTP or HTTPS URL to snapshot and compare. |
| baselineId | string | Optional snapshot ID previously returned for the same normalized URL. Omit to compare with the latest stored snapshot. |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"url": "https://example.com/",
"changed": null,
"changes": null,
"current": {},
"baseline": null,
"createdAt": "2026-10-09T00:00:00.000Z",
"snapshotId": "123e4567-e89b-42d3-a456-426614174000",
"contentHash": "sha256-example"
},
"tool": "monitor_website_changes",
"requestId": "123e4567-e89b-42d3-a456-426614174000"
}
}Tags
x402
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