Cyprus Government Open Data.
Open Government, Cyprus API is a free Government API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Details from data.gov.cy.

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The Open Government, Cyprus API is provided by National Opendata Portal (data.gov.cy).
Yes. The Open Government, Cyprus API is listed in the Government 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 Open Government, Cyprus API requires no authentication, so you can start making requests without signing up.
CORS support for the Open Government, Cyprus API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Open Government, Cyprus API is served over HTTPS, so it's safe to use in production.