$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.

Additionally, everyone must ensure to trade on reputable exchanges for peace of mind regarding your assets. Avoid unknown exchanges at all costs.