
Transitland API.
Community Transit API is a free Transportation API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Transitland v1 core components. Deprecated. See Transitland v2.
Details from github.com.

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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.
Cruise sailings, day-by-day itineraries, weekly fare history, port traffic and a cruise price index
The Community Transit API is provided by transitland (github.com). Transitland v1 core components. Deprecated. See Transitland v2.
Yes. The Community Transit API is listed in the Transportation 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 Community Transit API requires no authentication, so you can start making requests without signing up.
CORS support for the Community Transit API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Community Transit API is served over HTTPS, so it's safe to use in production.