agent402.tools TLS Certificate Inspector

x402

agent402.tools TLS Certificate Inspector is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Fetches and returns the TLS certificate details of any public hostname, including subject, issuer, validity window, days remaining, SANs, and SHA-256 fingerprint.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

Inspect the TLS certificate of any public host: subject, issuer, validity window, days remaining, SANs, and SHA-256 fingerprint.

Output

Returns structured details about the host's TLS certificate: subject common name, issuer organization, validity start and expiry dates, days remaining until expiry, the list of Subject Alternative Names (SANs), and the SHA-256 fingerprint of the certificate.

Example use cases

Example prompt

“What does the TLS certificate look like for api.stripe.com — I want to know the issuer, how many days it has left, its SANs, and the SHA-256 fingerprint.”

Technical details

Endpoint

POSThttps://agent402.tools/api/tls-cert

When to prefer

Use this endpoint when you need to programmatically inspect a live TLS certificate for any public HTTPS host — especially to check expiry dates, verify issuers, retrieve SANs for coverage validation, or obtain a SHA-256 fingerprint for certificate pinning or security audits. Prefer this over manual browser inspection or openssl CLI when automation or agent-driven workflows are needed.

Side effects

Host not reachable or does not support TLS — returns connection error
Invalid or malformed hostname — returns validation error
Certificate chain is broken or self-signed in unexpected way — may return partial data or error
Port 443 not open on the specified host — returns timeout or connection refused
Host field missing from request body — returns 400 bad request

Input

Schema · Request body

Field	Type	Description
host	string	Hostname (port 443)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "host": "example.com",
    "issuer": "DigiCert",
    "validTo": "2027-01-01T00:00:00.000Z",
    "altNames": [
      "example.com"
    ],
    "daysRemaining": 204
  }
}

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How this service works

Inspect the TLS certificate of any public host: subject, issuer, validity window, days remaining, SANs, and SHA-256 fingerprint.

Output

Technical details

Endpoint

POSThttps://agent402.tools/api/tls-cert

When to prefer

Side effects

Host not reachable or does not support TLS — returns connection error
Invalid or malformed hostname — returns validation error
Certificate chain is broken or self-signed in unexpected way — may return partial data or error
Port 443 not open on the specified host — returns timeout or connection refused
Host field missing from request body — returns 400 bad request

Input

Schema · Request body

Field	Type	Description
host	string	Hostname (port 443)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "host": "example.com",
    "issuer": "DigiCert",
    "validTo": "2027-01-01T00:00:00.000Z",
    "altNames": [
      "example.com"
    ],
    "daysRemaining": 204
  }
}