Checkiday - National Holiday
Industry-leading holiday data with over 5,000 holidays and thousands of descriptions
Catholic liturgical calendar.
Church Calendar API is a free Calendar API that requires no API key, is only available over HTTP and has unconfirmed CORS support.

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Industry-leading holiday data with over 5,000 holidays and thousands of descriptions
Worldwide Holidays
Lookup for a name and returns nameday date
Fastest and most advanced public holiday and observance service on the market
Yes. The Church Calendar API is listed in the Calendar 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 Church Calendar API requires no authentication, so you can start making requests without signing up.
CORS support for the Church Calendar API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
No. The Church Calendar API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.