One Bitcoin is 83,000, the transaction fee is 0.05%. If the opening and closing prices are similar, the total fee will be 0.25%, which is 0.1%, 83,000 × 0.1% = 83u. If your opening and closing price difference exceeds 0.1%, it is just enough to cover the transaction fee. If your closing price difference is not higher than 0.1%, you see that your account is profitable, but if you deduct the fee, you are still at a loss. Of course, if you have done a fee rebate with me, you can profit with a price difference of over 0.05%.