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The Stall — Web Change Monitor
x402
The Stall — Web Change Monitor is a paid API for AI agents from the-stall.intuitek.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Polls a publicly accessible URL via HTTP GET and detects whether the page content has changed since the last check
Price / call$0.005
Success—
StatusUnknown
How this service works
Returns content-change signals for any public URL: ETag, Last-Modified, Content-Length, and Content-Type via HTTP HEAD. Falls back to GET + SHA-256 of the first 32 KB when the server returns no cache markers. Store the snapshot and re-call periodically to detect changes. Useful for monitoring competitor pricing, news, regulatory filings, or any public page.
Output
Returns an indication of whether the target URL's content has changed, along with relevant metadata about the current page state such as a content hash, diff, or snapshot that can be compared against a prior state.
Example use cases
Example prompt
“Keep an eye on https://example.com/pricing for me — let me know if the content on that page has changed since the last time you checked it.”
Technical details
Endpoint
GEThttps://the-stall.intuitek.ai/cap/web-change-monitorWhen to prefer
Use this endpoint when you need a lightweight, pay-per-call web change detection check without setting up accounts, API keys, or a dedicated monitoring subscription. Ideal for one-off or infrequent polling of public URLs, or for integrating change detection into an agent workflow that already uses the x402/USDC payment rail on Base mainnet.
Side effects
- URL is not publicly accessible — returns error or timeout
- Non-HTTPS/HTTP URL provided — schema validation fails
- Target server returns 4xx/5xx — cannot retrieve content to compare
- URL parameter missing from queryParams — required field validation error
- Network timeout reaching the target URL
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"url": "https://example.com"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| required | string | |
| properties | string |
Output
{
"ts": "2026-06-18T06:28:37.579Z",
"url": "https://example.com",
"etag": null,
"method_used": "HEAD",
"status_code": 200,
"content_hash": null,
"content_type": "text/html",
"last_modified": "Wed, 17 Jun 2026 20:54:39 GMT",
"content_length": null
}Tags
x402
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