If you want real time streaming, you can sign up for tdameritrade, and then request API access. It's free, and decent quality. The interface is RESTful, but t

If you want real time streaming, you can sign up for tdameritrade, and then request API access. It's free, and decent quality. The interface is RESTful, but the data is a funky binary format that's hard to parse without the documentation they make you sign an NDA to get. http://www.tdameritrade.com/tradingtools/partnertools/api_dev.html http://www.tdameritrade.com/tradingtools/partnertools/api_de...