To retrieve Walltime's market info.
Walltime API is a free Blockchain API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Yes. The Walltime API is listed in the Blockchain 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.
No. The Walltime API requires no authentication, so you can start making requests without signing up.
CORS support for the Walltime API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Walltime API is served over HTTPS, so it's safe to use in production.