Web parser.
Mercury API is a free Documents & Productivity API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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