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how.is TLS Certificate Inspector
x402
how.is TLS Certificate Inspector is a paid API for AI agents from how.is, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).
Returns TLS certificate validity, issuer, protocol, cipher, and days until expiry for a given domain.
Price / call$0.005
Success—
StatusUnknown
How this service works
Certificate validity, issuer, protocol and days until expiry for a domain.
Output
A JSON object containing: validity status, issuer, subject, subject alt names, validFrom and validTo dates, daysUntilExpiry (integer), TLS protocol version, cipher suite, and whether the certificate is self-signed. Also includes a payment receipt with rail, tool, USD charge, and settlement transaction hash.
Example use cases
Pre-deployment certificate expiry check
“Before we push to production, check the TLS certificate on staging.myapp.com — is it still valid, and how many days do we have left before it expires?”
Third-party API security audit
“I'm about to integrate with payments.vendor.io — can you pull their TLS certificate info so I know who issued it, what protocol they're running, and whether it's self-signed?”
SSL monitoring alert triage
“We got an alert that something is off with the cert on secure.example.com — can you look up the certificate details, including validity, issuer, and cipher, so I can figure out what's wrong?”
Technical details
Endpoint
POSThttps://how.is/v1/domain/tls?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need programmatic, structured TLS certificate data for a domain — especially issuer identity, protocol version, cipher, and expiry countdown — rather than a raw openssl command or manual browser check. Ideal for security audits, pre-integration checks, automated monitoring pipelines, and agent workflows that need to reason about certificate trustworthiness before making outbound connections.
Side effects
- Domain does not exist or is unreachable — certificate lookup fails
- Domain has no HTTPS listener — no TLS data returned
- Invalid domain format supplied — input validation error
- Certificate is expired or revoked — returned with validity flag reflecting state
- Network timeout reaching the target domain
- Rate limiting or payment failure via x402 protocol
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domain | string | A bare domain name, e.g. example.com |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"_shape": "data.data: valid, issuer, subject, subjectAltNames, validFrom, validTo, daysUntilExpiry, protocol, cipher, selfSigned."
},
"result": "TLS certificate for the requested subject",
"receipt": {
"rail": "x402",
"tool": "tls",
"charge_usd": 0.005,
"settlement_tx": "0x…"
}
}
}Tags
x402
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