Is This Site Down?
Check if any website is down, from two continents; live status, uptime history and TLS expiry
Check if websites and online services are currently down.
isitdownstatus API is a free Development API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Check if any website is down, from two continents; live status, uptime history and TLS expiry
Convert JSON to JSONP (on-the-fly) for easy cross-domain data requests using client-side JavaScript
Yes. The isitdownstatus API is listed in the Development category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The isitdownstatus API requires no authentication, so you can start making requests without signing up.
CORS support for the isitdownstatus API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The isitdownstatus API is served over HTTPS, so it's safe to use in production.