SSL Certificate Check

Inspect SSL/TLS certificate for any domain. Returns valid boolean, days_remaining, issuer, valid_from, valid_to, subject_alt_names (SANs), fingerprint_sha256, and protocol version. Default port 443. Use for certificate expiry monitoring, security audits, or HTTPS verification.

Run free trial ↗3 free calls per day with the example input. Paid: $0.002 USDC, no limit.

Call it

import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agentsvc.io/api/v1/proxy/ssl-check", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({"domain":"github.com"}),
});
const { data, payment } = await res.json();  // payment.transaction = on-chain receipt

Input

Field	Type	Description
domain *	string	Domain to check SSL for (e.g. 'github.com', 'api.example.com'). Do not include https://
port	integer = 443	Port to check (default: 443)

Output

Field	Type	Description
domain	string	The checked domain
port	integer	The port that was checked
valid	boolean	true if certificate is currently valid and not expired
subject	string	Certificate subject (CN=...)
subject_alt_names	array	Subject Alternative Names the cert is valid for
issuer	string	Certificate issuer organization
valid_from	string	Certificate valid-from date (ISO 8601)
valid_to	string	Certificate expiry date (ISO 8601)
days_remaining	integer	Number of days until certificate expires (negative = already expired)
serial_number	string	Certificate serial number (hex)
fingerprint_sha256	string	SHA-256 fingerprint of the certificate
protocol	string	TLS protocol version in use (e.g. TLSv1.3)

Example response (data)

{
  "domain": "github.com",
  "port": 443,
  "valid": true,
  "subject": "CN=github.com",
  "subject_alt_names": [
    "github.com",
    "www.github.com"
  ],
  "issuer": "DigiCert Inc",
  "valid_from": "2024-03-07T00:00:00.000Z",
  "valid_to": "2025-03-07T23:59:59.000Z",
  "days_remaining": 156,
  "serial_number": "0a:bc:12:...",
  "fingerprint_sha256": "AB:CD:EF:...",
  "protocol": "TLSv1.3"
}