DOCUMENTATION

certs.

One-off check, no account

POST /v1/certs/check-now with a JSON body {"domain": "example.com"} returns the active TLS certificate, six kinds of DNS records (A, AAAA, MX, NS, TXT, CNAME) and the domain expiration date at the registry. Limited to 20 requests per minute per IP address.

What the free tier covers

Unlimited continuously monitored domains, email alerts at 60, 30, 14, 7, 3 and 1 day before expiration, plus an immediate alert on any change to the NS or MX records.

What isn't delivered yet

Certificate revocation (OCSP/CRL), TLS configuration auditing and a mobile app are explicitly outside the minimal product (see the certs. spec). Email only, never SMS or phone calls.