Where to get real-time S&P 500 cash index data?

Discussion in 'Data Sets and Feeds' started by Code7, Nov 4, 2009.

  1. Code7


    It seems like most data vendors are simply transmitting the cash index feed of the exchange. For example, in TradeStation there is $SPX.X from CBOE and $INX from US. However, both symbols are only updated every 15 seconds. I'd like to get more frequent updates like every 100 ms or so. Does anyone know a data vendor that calculates own index data and sends more updates?