IP/domain/URL reputation.
Phisherman API is a free Anti-Malware API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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