
Websocket API to access realtime stock data.
Real Time Finance API is a free Finance API that requires apiKey authentication, is only available over HTTP and has unconfirmed CORS support.
Public websocket API to get datas from financial markets
Details from github.com.

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The Real Time Finance API is provided by Real-time-finance (github.com). Public websocket API to get datas from financial markets
Yes. The Real Time Finance API is listed in the Finance 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 Real Time Finance API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Real Time Finance API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
No. The Real Time Finance API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.