Stocklytics provides stock market data of all sorts, from ticker symbol quotes with charts, to news and even Twitter results about the particular stock. The three major US markets are supported: NASDAQ, AMEX and NYSE.
The Historical Prices API can be used to look up the Open, Close, High and Low price, as well as the volume of stock traded for a stock code within a particular date range. The API supports the downloading of the entire historical data set on file for a stock going back to January 1st 1980. The Stocklytics API makes the Stocklytics data available as a RESTful API with JSON and CSV output.