Simple database service.
Micro DB API is a free Development API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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