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fetchx402 Uptime Check
x402
fetchx402 Uptime Check is a paid API for AI agents from api.fetchx402.com, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).
Performs a one-shot DNS resolution, leaf TLS inspection, and origin HTTP header probe for a single hostname in one API call to determine if it is up, degraded, or down.
Price / call$0.015
Success—
StatusUnknown
How this service works
One-shot reachability: DNS, leaf TLS, and origin headers for one hostname in a single settle. Use when you need live up/degraded/down and must not guess. Child errors stay in-field; we do not invent data.
Output
A structured bundle containing: (1) DNS lookup outcome (resolved IPs or error), (2) leaf TLS certificate status (validity, expiry, issuer), and (3) origin HTTP response headers — all labeled with per-field status so degraded or failed sub-checks are surfaced in-field rather than suppressed. The top-level status indicates up, degraded, or down.
Example use cases
Pre-deployment reachability gate
“Before we push this release, check that staging.myapp.com is fully reachable — DNS resolves, TLS is valid, and the origin responds — so we don't deploy to a dead host.”
Incident triage for downed service
“We're getting alerts that payments.acme.io might be down — can you do a live probe right now to tell me if it's a DNS failure, a TLS problem, or the origin itself not responding?”
Third-party dependency health check
“I integrate with api.partnerservice.com and I'm not sure if they're having issues — can you check live DNS, TLS, and HTTP reachability for that hostname and tell me if anything looks degraded?”
Technical details
Endpoint
GEThttps://api.fetchx402.com/v1/bundles/uptime-checkWhen to prefer
Choose this endpoint when you need a single authoritative probe covering DNS, TLS, and HTTP origin reachability for one hostname in one call and one payment settle. Prefer it over calling individual DNS, TLS, or header endpoints separately when you need an aggregated up/degraded/down verdict quickly. Use it for incident triage, pre-deployment checks, or third-party dependency monitoring where a cached or inferred status is unacceptable.
Side effects
- Domain is an IP, localhost, or internal/mDNS name — rejected by domain guard validation
- Domain does not resolve in DNS — DNS sub-check fails with NXDOMAIN or timeout error returned in-field
- TLS handshake fails (expired cert, mismatched SAN, untrusted CA) — TLS sub-check fails in-field
- Origin does not respond within timeout — HTTP sub-check fails in-field
- Invalid or malformed domain name provided — request rejected with validation error
- Network-level unreachability from probe infrastructure — returned as down with error detail
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"dns": {
"ttl": 20,
"type": "A",
"rcode": "NOERROR",
"domain": "example.com",
"records": [
{
"address": "104.20.23.154"
}
],
"resolver": "1.1.1.1"
},
"ssl": {
"sni": "example.com",
"port": 443,
"sans": [
"www.example.org",
"example.com",
"example.net",
"example.org"
],
"cipher": "aes_256_gcm_sha384",
"domain": "example.com",
"issuer": "CN=DigiCert Global G3 TLS ECC SHA384 2020 CA1, O=DigiCert Inc, C=US",
"serial": "0f1a2b3c4d5e6f708192a3b4c5d6e7f8",
"expired": false,
"peer_ip": "23.215.0.138",
"subject": "CN=www.example.org, O=Internet Corporation for Assigned Names and Numbers, C=US",
"not_after": "2027-01-15T23:59:59Z",
"not_before": "2026-01-15T00:00:00Z",
"tls_version": "tlsv1.3",
"not_yet_valid": false,
"hostname_match": true,
"fingerprint_sha256": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
"signature_algorithm": "ecdsa-with-SHA384"
},
"domain": "example.com",
"headers": {
"url": "https://example.com/",
"domain": "example.com",
"method": "HEAD",
"status": 200,
"headers": {
"server": "ECS (nyb/1D2A)",
"location": null,
"content-type": "text/html",
"x-powered-by": null,
"cache-control": "max-age=604800",
"referrer-policy": null,
"x-frame-options": null,
"www-authenticate": null,
"permissions-policy": null,
"x-content-type-options": null,
"content-security-policy": null,
"strict-transport-security": "max-age=31536000",
"cross-origin-opener-policy": null,
"access-control-allow-origin": null,
"cross-origin-resource-policy": null,
"content-security-policy-report-only": null
},
"peer_ip": "23.215.0.138"
},
"verdict": "up"
}
}Tags
x402
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