Sync your GitHub projects with Travis CI to test your code in minutes.
Travis CI API is a free Continuous Integration API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Details from docs.travis-ci.com.

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The Travis CI API is provided by Travis CI (docs.travis-ci.com).
Yes. The Travis CI API is listed in the Continuous Integration 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 Travis CI API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Travis CI API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Travis CI API is served over HTTPS, so it's safe to use in production.