Geodata.gov.gr
Open geospatial data and API service for Greece
Geocoding of city name by using latitude and longitude coordinates.
GeoDataSource API is a free Geocoding API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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