API Watch
Monitor your API for free — uptime, response time and certificate expiry.
Check any public HTTP endpoint in one click, then have it checked every 5 minutes for free. You get an email when it stops answering (after two failed checks in a row, never on a blip), one when it recovers, and a warning 14, 7, 3 and 1 days before its TLS certificate expires. Every Monday, a short report: uptime, checks, incidents, average and worst latency. Each monitor can have a public status page and a README badge. Free means 5 monitors, a check every 5 minutes, 30 days of history and certificate warnings — no card. Endpoints that refuse a plain GET (webhook receivers, authenticated APIs) can be watched in 'reachable' mode, so a 401 or 405 is not treated as an outage. Five tools live here too, each answering one question by actually making the request: HTTP status codes, SSL certificate details, the full redirect chain hop by hop, a real CORS preflight with the rule that failed, and a three-sample response time test.
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