Get global city, region, and country data.
GeoDB Cities API is a free Geocoding API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Get global city, region, and country data for use in your apps. GraphQL and REST API supports multiple search filters and languages for displaying results.
Details from geodb-cities-api.wirefreethought.com.

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Yes. The GeoDB Cities API is listed in the Geocoding 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 GeoDB Cities API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the GeoDB Cities API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The GeoDB Cities API is served over HTTPS, so it's safe to use in production.