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Blog / 2026-10-04

Check SSL certificates and domain expiry for a whole list of domains

An expired certificate or a lapsed domain takes a site down at the worst time, and it is almost always avoidable. If you look after more than a handful of domains, the useful question is not "what are the details for each?" but "which ones need attention this month?".

One request

curl "https://api.ambolt.dev/v1/domain-ssl-sweep?domain=sitemaps.org&warnDays=30&free=1"

The answer has a summary and one result per domain:

{
  "checked": 1,
  "readable": 1,
  "flagged": 0,
  "warnDays": 30,
  "results": [
    {
      "domain": "sitemaps.org",
      "ok": true,
      "ssl": {
        "issuer": "Microsoft Corporation",
        "notAfter": "2026-12-07T04:56:13.000Z",
        "trusted": true,
        "daysLeft": 64,
        "expired": false
      },
      "registration": {
        "registered": true,
        "expiresAt": "2027-08-12T23:51:55Z",
        "daysToExpiry": 313,
        "registrar": "MarkMonitor Inc.",
        "nameservers": ["ns3-02.azure-dns.org", "ns1-02.azure-dns.com"]
      },
      "flags": []
    }
  ]
}

Recorded 2026-10-03; fields trimmed. flags stays empty until something expires inside the window you set with warnDays, so a scheduled job only has to look at flagged and the flags.

A whole list

Pass domains with a list instead of domain, or run the Apify Actor on a schedule and send the flagged rows to your alerting. You are billed per domain checked; a domain that cannot be reached is listed with the reason and not charged.

What it does not return

Registrant details are never returned. SSL data comes from the certificate the server presents, and domain data from the registry's RDAP service, so a registry that does not publish an expiry date shows no date rather than a guess.

See the catalog for the tool and its price.

Try it free: SSL certificate checker runs the same call in your browser (one free check per tool and IP address per day). API reference

More from the blog

Data and prices change; every API response states its source and date. Informational only, not financial, legal or tax advice.