ISRO Space Crafts Information.
ISRO API is a free Science & Math API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.
Details from isro.vercel.app.

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The ISRO API is provided by ISRO-API (isro.vercel.app).
Yes. The ISRO API is listed in the Science & Math 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 ISRO API requires no authentication, so you can start making requests without signing up.
Not directly. The ISRO API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The ISRO API is served over HTTPS, so it's safe to use in production.