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Tool for testing APIs.
Postman API is a free Development API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Details from postman.com.

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Free auto-updating list of live-tested proxies (HTTP/HTTPS/SOCKS4/SOCKS5), refreshed every 6 h
Rotating Proxy API that produces a working proxy on every request
The Postman API is provided by Postman (postman.com).
Yes. The Postman API is listed in the Development 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 Postman API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Postman API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Postman API is served over HTTPS, so it's safe to use in production.