Decentralized Open-Source Cloud Storage.
Storj API is a free Cloud Storage & File Sharing API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
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Details from docs.storj.io.

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The Storj API is provided by Storj Docs (docs.storj.io). Make the world your datacenter
Yes. The Storj 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 Storj API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Storj API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Storj API is served over HTTPS, so it's safe to use in production.