Live Canadian emergency room closures and service disruptions, by province.
ERstat API is a free Health API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Yes. The ERstat 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.
Yes. The ERstat API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The ERstat API supports CORS, so front-end JavaScript can call it directly.
Yes. The ERstat API is served over HTTPS, so it's safe to use in production.