
Federal Statistical Office Germany.
GENESIS API is a free Open Data API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Information and documentation regarding the integration of interfaces into your own applications.
Details from destatis.de.

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The GENESIS API is provided by Federal Statistical Office (destatis.de). Information and documentation regarding the integration of interfaces into your own applications.
Yes. The GENESIS API is listed in the Open Data 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 GENESIS API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the GENESIS API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The GENESIS API is served over HTTPS, so it's safe to use in production.