$BTC If you play contracts, you must have a rebate; otherwise, it can be very disadvantageous. Let me calculate a scenario for you. For example, if you use 200u to open a 50x position, you are effectively holding 10,000u. Based on an average fee of 0.04%, the opening fee would be 4u and the closing fee would be 4u. So, without doing anything, you would incur a total contract fee of 8u. Don't underestimate this small amount; over the course of a day, if you open several orders or frequently trade short-term, this becomes a significant cost. If there is a rebate, you can get back half of these fees, which adds up if you often trade contracts.