How much you receive on a Swap
Fee comes out of the amount you spend. The preview before confirm is what you should get.
Fee
Swap/trading fee is a percentage of the notional, according to your VIP rank. It is taken from the asset you swap away, so the number on screen is meant to be the number you pay.
Preview
Read From amount, To amount, and fee before you press the button. If you confirm, that is the fill.
Stable to stable
Swapping USDT-like stables still pays the fee. There is no “fee-free USD rail” unless Fees says so — it does not.