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Agent Market Lab Web Data – Website Change Check
x402
Agent Market Lab Web Data – Website Change Check is a paid API for AI agents from agent-market-lab-v2.dourfer-r.workers.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-10).
Snapshots a public URL and detects whether its content has changed since a previous baseline snapshot, returning a diff and new snapshot ID.
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 three fields: 'changed' (boolean or null if no prior snapshot exists to compare against), 'changes' (a description or diff of what changed, or null if unchanged/no baseline), and 'snapshotId' (a UUID for the freshly created snapshot, usable as a baseline in future calls).
Example use cases
Competitor pricing change alert
“Check if https://competitor.com/pricing has changed since my last snapshot — my baseline ID is 9a7b3c1d-1234-5678-abcd-ef0123456789. Let me know if anything is different.”
E-commerce product availability monitoring
“Has the product page at https://shop.example.com/products/widget-pro changed at all since snapshot d4e5f6a7-89ab-cdef-0123-456789abcdef? I want to know if stock or price moved.”
Government regulation page tracking
“I need to know if https://regulations.example.gov/rules/2024 has been updated since I last captured it — no baseline yet, just compare with whatever you have stored and give me a new snapshot ID.”
Technical details
Endpoint
POSThttps://agent-market-lab-v2.dourfer-r.workers.dev/v1/website-change-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to detect whether a specific public web page has changed between two points in time, especially when you already have a baseline snapshot ID from a prior call. It is ideal for autonomous agents that need to monitor individual URLs for content drift — pricing changes, availability updates, regulatory amendments — without building custom scraping infrastructure. Prefer this over generic scraping endpoints when change detection (diff) is the primary goal rather than full content extraction.
Side effects
- URL is not publicly accessible or returns non-200 status — check/changes may be null
- Invalid or expired baselineId UUID — comparison may fall back to latest stored snapshot or return null
- Malformed URL input — 422 validation error
- Payment not completed via x402 — 402 Payment Required
- Rate limiting or Cloudflare Worker timeout for very large pages
- First-time URL with no stored snapshot — 'changed' and 'changes' will be null, only snapshotId is returned
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": {
"changed": null,
"changes": null,
"snapshotId": "uuid"
}
}Tags
x402
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