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x402 Agent Services – SSL Certificate Checker
x402
x402 Agent Services – SSL Certificate Checker is a paid API for AI agents from call402.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-30).
Checks the TLS/SSL certificate status of a given domain, returning expiry, issuer, chain validity, fingerprint, and SANs
Price / call$0.005
Success—
StatusUnknown
How this service works
USDC pay-per-call APIs for AI agents via the x402 protocol (v2, exact, Base mainnet). Send a request, receive HTTP 402 with payment requirements, pay with @x402/fetch or any x402 client, retry with the PAYMENT-SIGNATURE header.
Output
Returns a JSON object with the domain's TLS certificate details: issuer (O and CN), subject CN, validity window (valid_from / valid_to), days remaining, expiry status (expired boolean), chain verification result, SHA-256 fingerprint, serial number, port used, and list of subject alt names (SANs). Also includes a meta field indicating the data source (direct TLS handshake).
Example use cases
Pre-launch HTTPS health check
“Before we go live tomorrow, check the SSL certificate on staging.myapp.com and confirm it's valid, trusted, and not expiring within the next 30 days.”
Monitor partner API cert expiry
“Check the TLS certificate on payments.partnerapi.com and tell me the exact expiry date and issuer so I can set up a renewal reminder.”
Diagnose HTTPS connection error
“Our users are getting SSL errors on secure.mystore.com — can you inspect the certificate and tell me if the chain is verified and whether the cert covers that hostname?”
Technical details
Endpoint
POSThttps://call402.com/api/ssl-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need programmatic, real-time TLS certificate inspection for a specific domain — especially in agent workflows monitoring certificate expiry, validating HTTPS configuration before deployments, or diagnosing SSL errors. Prefer this over manual browser inspection or cert-monitoring SaaS dashboards when you need machine-readable certificate metadata on demand at low cost.
Side effects
- Domain does not exist or is unreachable — connection timeout or DNS failure
- Port is not open or not serving TLS — connection refused
- Certificate chain verification fails — chain_verified returns false
- Invalid host format in request body — validation error
- Payment not included — HTTP 402 returned with payment requirements before any check is performed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| host | string | Domain name, optionally host:port (default port 443) |
Output
Schema · Response
{
"type": "json",
"example": {
"host": "example.com",
"meta": {
"source": "direct TLS handshake (first-party)"
},
"port": 443,
"issuer": {
"O": "Let's Encrypt",
"CN": "R13"
},
"expired": false,
"subject": {
"CN": "example.com"
},
"valid_to": "Nov 30 00:00:00 2026 GMT",
"valid_from": "Sep 1 00:00:00 2026 GMT",
"serial_number": "03AB...",
"chain_verified": true,
"days_remaining": 40,
"fingerprint256": "AA:BB:...",
"subject_alt_names": [
"example.com",
"www.example.com"
]
}
}Tags
x402
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