NovaDAX API to access all market data, trading management endpoints.
NovaDax API is a free Cryptocurrency API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Details from doc.novadax.com.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
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The NovaDax API is provided by NovaDAX API (doc.novadax.com).
Yes. The NovaDax API is listed in the Cryptocurrency 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 NovaDax API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the NovaDax API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The NovaDax API is served over HTTPS, so it's safe to use in production.