Too Long; Didn't Read
There are 6 main data market providers to be reviewed: Twelve Data Polygon.io IEX Cloud Alpha Vantage Intrinio Xignite.io. The data is obtained from the stock exchanges and aggregated into various intervals from 1 minute to 1 month. Polygon will be the right choice for those who seek US exchange specific data and is willing to do a lot of additional code. The list is based on specific parameters to find the best stock data API and what APIs professional traders are using.