TLS certificate

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

Input

Field	Type	Description
host *	string	Hostname (port 443)

Example output

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

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/tls-cert \
  -H "Content-Type: application/json" \
  -d '{"host":"example.com"}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

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

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/tls-cert", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "host": "example.com"
  }),
});

Related tools