GDAX, for example, has a maker/taker type of fee structure that charges you based on your account volume: https://www.gdax.com/fees https://www.gdax.com/fees T

GDAX, for example, has a maker/taker type of fee structure that charges you based on your account volume: https://www.gdax.com/fees https://www.gdax.com/fees There are many ways an exchange can collect fees. An exchange doesn't have to take a spread but it is too tempting since it is easily hidden.