looks like the SPY always leads the ES by 1 day on your charts? i wish it were that easy but sadly i guess you have a setting wrong in your charts...
i would echo prior posters. arbing the ES and SPY (or other similar combos) is possible but requires top-drawer execution speed and ultra-low comms. this is the true realm of high-freq trading
i would echo prior posters. arbing the ES and SPY (or other similar combos) is possible but requires top-drawer execution speed and ultra-low comms. this is the true realm of high-freq trading