IPFS Pinning Services API.
Pinata 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.pinata.cloud.

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Free JSON storage for small projects
The Pinata API is provided by Pinata Docs (docs.pinata.cloud). Start uploading and retrieving content in no time
Yes. The Pinata 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 Pinata API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Pinata API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Pinata API is served over HTTPS, so it's safe to use in production.