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Mekler AI TLS Certificate Inspector
x402
Mekler AI TLS Certificate Inspector is a paid API for AI agents from api.mekler.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-29).
Inspects a public host on TCP port 443 for TLS certificate validity, expiry, DNS names, fingerprint, and negotiated cipher/version details
Price / call$0.005
Success—
StatusUnknown
How this service works
Inspect a public host on TCP port 443 for certificate expiry, DNS names, fingerprint, runtime CA/hostname validation and negotiated TLS details. A failed certificate check triggers one unverified diagnostic handshake and remains untrusted. No HTTP scanning, revocation or exhaustive security assessment.
Output
Returns a JSON object containing: port (443), negotiated cipher suite, SHA-256 certificate fingerprint, overall status, hostname, verified boolean, DNS SANs array, not_before and not_after timestamps, time_valid boolean, seconds_until_expiry, observed_at timestamp, TLS version, verification_error_code (if any), and a limitations array describing scope constraints of the check.
Example use cases
Pre-deployment certificate health check
“Before we push to production, can you check the TLS certificate on staging.myapp.io — confirm it's valid, trusted, and won't expire in the next 30 days?”
Monitoring expiry for a critical domain
“Check the TLS certificate for payments.acme.com and tell me exactly how many seconds until it expires and whether it currently passes hostname verification.”
Investigating a TLS handshake failure
“Our users are getting SSL errors on checkout.storefront.com — can you inspect its certificate and tell me the verification error code, DNS names, and whether it's actually trusted by the runtime CA store?”
Technical details
Endpoint
POSThttps://api.mekler.ai/v1/web/tls/inspect-certificate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, structured TLS certificate inspection for a public hostname — specifically to check expiry, verify trust, retrieve DNS SANs, fingerprint, and negotiated TLS version/cipher — without needing HTTP scanning, OCSP revocation checking, or a full security audit. It is ideal for automated certificate monitoring, pre-deployment checks, and lightweight TLS diagnostics in agentic workflows where cost and latency matter.
Side effects
- Hostname does not resolve in public DNS — no handshake possible
- Host unreachable or connection refused on port 443 — timeout or connection error
- Certificate fails verification — triggers one additional unverified diagnostic handshake; certificate remains untrusted and verification_error_code is populated
- Invalid hostname format exceeding 253 characters — input validation error
- Host is not a public DNS host (private IP or internal name) — not supported
- Service-side network issues may cause transient failures
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| hostname | string | |
| request_id | string |
Output
Schema · Response
{
"type": "json",
"example": {
"port": 443,
"cipher": "TLS_AES_256_GCM_SHA384",
"sha256": "0000000000000000000000000000000000000000000000000000000000000000",
"status": "ok",
"hostname": "mekler.ai",
"verified": true,
"dns_names": [
"mekler.ai"
],
"not_after": "2027-01-01T00:00:00+00:00",
"not_before": "2026-10-01T00:00:00+00:00",
"time_valid": true,
"limitations": [
"One remote handshake from the deployed service; DNS, certificate and routing can change.",
"verified uses the runtime CA store and hostname validation. Certificate failure triggers one unverified handshake to collect diagnostics; it does not make the certificate trusted.",
"No revocation/OCSP, certificate-transparency, exhaustive protocol/cipher scan or overall security guarantee. Only public DNS hosts on port 443; no HTTP request is sent."
],
"observed_at": "2026-10-20T00:00:00Z",
"tls_version": "TLSv1.3",
"seconds_until_expiry": 6307200,
"verification_error_code": null
}
}Tags
x402
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