Check if a number is even.
isEven (humor) API is a free Science & Math API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
isEven API tells you if a number is even
Details from isevenapi.xyz.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
ISRO Space Crafts Information
The isEven (humor) API is provided by isEven API (isevenapi.xyz). isEven API tells you if a number is even
Yes. The isEven (humor) API is listed in the Science & Math 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 isEven (humor) API requires no authentication, so you can start making requests without signing up.
CORS support for the isEven (humor) API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The isEven (humor) API is served over HTTPS, so it's safe to use in production.