I haven't started trading yet, so $0 . I just opened an account with Optimus Futures yesterday. Building API connection with CQG market data and FIX will take another 2 weeks. Backtesting executes ~15k trades per day on ES with an average profit of <$5/trade. So I guess multiply $1.33 CME fees * ~15k per day. I expect real life to eat me alive. Hopefully there will still be a little profit left after fees and bad fills. edit to add: I'm backtesting with only 1 contract, but theoretically, it could be more contracts per trade between 8:30 and 17:00 when there's more volume, so the CME fees would add up quickly if my strategy is viable in a live environment. A lot of that viability depends on the fees.