Here is SP500 FUTURES but not real time...Quote from lescor:
The spot price, or S&P 500 cash, is just where the index closed the previous day. Every financial website and data feed will have this. For futures you will want to use the emini, contract symbol ES. If you are relying on delayed data for this, your prices could be off significantly by the time the market opens if the futures have moved even a couple points. You should have real time ES prices, from your execution platform or charting service.
Like I said, there are lots of ways to trade once you're in. This just gives you an entry, after that it's all you. I submit orders from the same list of stocks each day. The number of fills will vary day to day, some days maybe 20% of orders are filled, some days none. This could be an insurmountable hurdle if you are trading in a retail account. You do not know how many positions you are going to have and how much capital it will require. Most retail brokers will count every open order against your margin, so you could run out pretty quick. It can be a very capital intensive strategy, which is why it's best suited to prop accounts.
http://www.bloomberg.com/index_americas.html
