This script is used to estimate how much an exchange/broker makes off a particular pair/symbol. If Coinbase(GDAX) has a 0.25% taker fee and a 0.15% maker fee per trade and you estimate the average commission fee at 0.19% then you simple input that, and how many periods you'd like to know the total fee for (30 periods on the 1 day chart = last 30 days, 28 periods...
