
Stock market data (real-time & historical).
Twelve Data API is a free Finance API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Try Twelve Data financial APIs for free with instant access to stock, forex, cryptocurrency, and fundamental market data. Real time, historical, and EOD data.
Details from twelvedata.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.
Public market-depth and sized exit estimates, not executable quotes
The Twelve Data API is provided by Twelve Data (twelvedata.com). Try Twelve Data financial APIs for free with instant access to stock, forex, cryptocurrency, and fundamental market data. Real time, historical, and EOD data.
Yes. The Twelve Data 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 Twelve Data API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Twelve Data API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Twelve Data API is served over HTTPS, so it's safe to use in production.