Search for company logos and embed them in your projects.
Clearbit Logo API is a free Business API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Details from clearbit.com.

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The Clearbit Logo API is provided by Clearbit (clearbit.com).
Yes. The Clearbit Logo API is listed in the Business 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 Clearbit Logo API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Clearbit Logo API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Clearbit Logo API is served over HTTPS, so it's safe to use in production.