Details on Covid-19 cases across Canada.
COVID-19 Tracker Canada API is a free Health API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Yes. The COVID-19 Tracker Canada API is listed in the Health 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 COVID-19 Tracker Canada API requires no authentication, so you can start making requests without signing up.
CORS support for the COVID-19 Tracker Canada API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The COVID-19 Tracker Canada API is served over HTTPS, so it's safe to use in production.