API for the "Arbeitsamt", which is a german Job board aggregator.
Arbeitsamt API is a free Jobs API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.

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