
RijksMuseum Data.
Rijksmuseum API is a free Art & Design API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Details from data.rijksmuseum.nl.

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The Rijksmuseum API is provided by Rijksmuseum Data Services (data.rijksmuseum.nl).
Yes. The Rijksmuseum API is listed in the Art & Design 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 Rijksmuseum API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Rijksmuseum API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Rijksmuseum API is served over HTTPS, so it's safe to use in production.