Calendarific
Worldwide Holidays

Industry-leading holiday data with over 5,000 holidays and thousands of descriptions.
Checkiday - National Holiday API is a free Calendar API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Industry-leading Holiday API. Over 5,000 holidays and thousands of descriptions. Trusted by the World’s leading companies.
Details from apilayer.com.

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Worldwide Holidays
Catholic liturgical calendar
Public holidays and business days for all 54 African countries, from official sources
Lookup for a name and returns nameday date
The Checkiday - National Holiday API is provided by APILayer (apilayer.com). Industry-leading Holiday API. Over 5,000 holidays and thousands of descriptions. Trusted by the World’s leading companies.
Yes. The Checkiday - National Holiday 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.
Yes. The Checkiday - National Holiday API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Checkiday - National Holiday API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Checkiday - National Holiday API is served over HTTPS, so it's safe to use in production.