File Sharing and Storage.
Box API is a free Cloud Storage & File Sharing API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
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Details from developer.box.com.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Super simple file sharing, convenient, anonymous and secure
The Box API is provided by Box Dev Docs (developer.box.com). Build with the Box Platform. Explore guides, API reference, SDKs, and tutorials for content management, Box AI, e-signatures, and enterprise integrations.
Yes. The Box 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 Box API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Box API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Box API is served over HTTPS, so it's safe to use in production.