Améthyste
Generate images for Discord users
Art.
Art Institute of Chicago API is a free Art & Design API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
The Art Institute of Chicago's API provides JSON formatted data as a REST-style service that allows developers to explore and integrate the museum’s data into their projects. This API is the same tool that powers our website, our mobile app, and many other technologies in the museum.
Details from api.artic.edu.

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Generate images for Discord users
Yes. The Art Institute of Chicago 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.
No. The Art Institute of Chicago API requires no authentication, so you can start making requests without signing up.
Yes. The Art Institute of Chicago API supports CORS, so front-end JavaScript can call it directly.
Yes. The Art Institute of Chicago API is served over HTTPS, so it's safe to use in production.