Developer Builds Free Background Domain and SSL Monitoring API With Webhook Alerts

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A developer created a publicly available API called ssl-domain-monitor after finding that existing tools on RapidAPI only offered on-demand domain checks rather than continuous background monitoring. The API allows users to register a domain once with a webhook URL, after which it automatically runs scheduled checks and pushes alerts to Slack, Discord, or a custom JSON endpoint. It monitors SSL/TLS certificate validity, DNS record changes, domain expiry via WHOIS/RDAP, and certificate transparency logs. The free tier supports up to three domains with 24-hour check intervals, and webhook-triggered alerts do not count against the API call limit. The tool is hosted on RapidAPI and is intended both as a personal backend engine for the developer's own projects and as a utility open to the public.

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