XOOMAR
US market data from SEC, FINRA, CFTC and the Fed: filings, insiders, earnings dates, short interest
Real time low latency Yahoo Finance API for stock market, crypto currencies, and currency exchange.
Yahoo Finance API is a free Finance API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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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.
US market data from SEC, FINRA, CFTC and the Fed: filings, insiders, earnings dates, short interest
Yes. The Yahoo 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 Yahoo Finance API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Yahoo Finance API supports CORS, so front-end JavaScript can call it directly.
Yes. The Yahoo Finance API is served over HTTPS, so it's safe to use in production.