Why can the fees differ for trades with the same transaction value?
On Binance Spot, if BNB fee deduction isn't enabled, fees are usually deducted from the asset you receive: the coin you buy when buying, and the quote currency you receive when selling.
Take note: Before trading, check the fee page to confirm your account's current tier and fee rate. Don't estimate costs based on memory.
On Binance, you can enable fee deductions using $BNB and receive discounts in accordance with the platform's rules.
Don't put all your savings on a single prediction.

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