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SiteCheck Uptime / URL Health Check
x402
SiteCheck Uptime / URL Health Check is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-16).
Checks whether 1–5 URLs are reachable, returning HTTP status, TLS status, response time, final URL after redirects, and content type for each.
Price / call$0.001
Success—
StatusUnknown
How this service works
Checks up to five public URLs now from this Worker: up or down, HTTP status, the final URL after up to five redirects, response time in milliseconds, whether TLS was used, content type and length, and the Cloudflare data centre (colo) the check ran from. A down site is a valid 200 answer with up false and the error, not a failure. The check is one GET per hop, so it measures the first response, not the full page.
Output
Returns a JSON object with a checks array — one entry per URL — each containing: up (boolean), tls (boolean), status (HTTP code), finalUrl (after redirects), redirects (count), responseTimeMs, contentType, and error (if any). Also includes checkedAt timestamp, total count, and the data-center colo where the check ran.
Example use cases
Pre-deployment website sanity check
“Before we go live, can you confirm that https://myapp.com and https://myapp.com/api/health are both returning 200 OK and loading in under 500ms?”
Diagnose a reported site outage
“Users are saying our site is down — can you check if https://shop.acme.com is actually reachable right now, and if not, what error it's returning?”
Verify redirect chains after domain migration
“We just migrated our domain — can you check if https://old-domain.com properly redirects to https://new-domain.com and that the final URL is correct?”
Technical details
Endpoint
GEThttps://api.sitecheck-api.workers.dev/api/uptime?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call HTTP reachability check for up to 5 URLs simultaneously, with redirect-following, TLS verification, and response-time measurement — without setting up infrastructure. Ideal for agents that need on-demand uptime verification rather than continuous scheduled monitoring.
Side effects
- URL is unreachable — up: false, error message returned
- TLS certificate invalid — tls: false
- Redirect loop or >5 hops — error reported
- Non-HTTP/HTTPS URL provided — validation error
- More than 5 URLs submitted — schema validation failure
- Timeout after 9 seconds — error field populated
- Malformed URL — request rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"colo": null,
"count": 1,
"checks": [
{
"up": true,
"tls": true,
"url": "https://example.com/",
"error": null,
"status": 200,
"finalUrl": "https://example.com/",
"redirects": 0,
"contentType": "text/html; charset=utf-8",
"contentLength": null,
"responseTimeMs": 81
}
],
"source": "Checked from this Worker (GET, redirects followed up to 5 hops, 9 s timeout)",
"checkedAt": "2026-10-15T14:07:52.571Z"
}
}Tags
x402
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