Generate random robot/alien avatars.
RoboHash API is a free Test Data API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Details from robohash.org.

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Generate spanish names (with gender) randomly
Generate spanish words randomly
The RoboHash API is provided by RoboHash (robohash.org).
Yes. The RoboHash API is listed in the Test 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.
No. The RoboHash API requires no authentication, so you can start making requests without signing up.
CORS support for the RoboHash API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The RoboHash API is served over HTTPS, so it's safe to use in production.