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Neuronto ARD Registry API is a free Open Source Projects API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.

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Yes. The Neuronto ARD Registry API is listed in the Open Source Projects 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 Neuronto ARD Registry API requires no authentication, so you can start making requests without signing up.
Yes. The Neuronto ARD Registry API supports CORS, so front-end JavaScript can call it directly.
Yes. The Neuronto ARD Registry API is served over HTTPS, so it's safe to use in production.