OBIS
Global marine species occurrence and distribution data
Facts pertaining to the physical science of Oceanography.
Ocean Facts API is a free Science & Math API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Global marine species occurrence and distribution data
ISS astronauts, current location, etc
REST API used to access NoctuaSky features
Repository and archive for study designs, research materials, data, manuscripts, etc
Yes. The Ocean Facts 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 Ocean Facts API requires no authentication, so you can start making requests without signing up.
CORS support for the Ocean Facts API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Ocean Facts API is served over HTTPS, so it's safe to use in production.