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Web3 Storage API is a free Cloud Storage & File Sharing API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Yes. The Web3 Storage API is listed in the Cloud Storage & File Sharing 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 Web3 Storage API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Web3 Storage API supports CORS, so front-end JavaScript can call it directly.
Yes. The Web3 Storage API is served over HTTPS, so it's safe to use in production.