
Icons.
Iconfinder API is a free Art & Design API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Search, retrieve, and download icons programmatically with the Magnific Icons API.
Details from developer.iconfinder.com.

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Icons (find "search icon" hyperlink in page)
The Iconfinder API is provided by Magnific API (developer.iconfinder.com). Search, retrieve, and download icons programmatically with the Magnific Icons API.
Yes. The Iconfinder API is listed in the Art & Design 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 Iconfinder API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Iconfinder API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Iconfinder API is served over HTTPS, so it's safe to use in production.