How to properly manage the quantity and fee?

API Spot/Margin API
1

So, I open BUY order for ETHUSDT for 0.0178 ETH because stepSize: 0.0001 Without fee it was 0,0177822

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Then I decided to sell ETH, but I can sell only 0.0177 because stepSize: 0.0001. So, I sold and currently I have 0.0000822 ETH and I can’t sell it because stepSize: 0.0001
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I could add fee to quantity before buy, but I can’t buy 0,0178178 because stepSize: 0.0001

So, how to properly manage the quantity to avoid such tails?

2

Maybe you could consider enable the feature that pay trading fee by BNB, then you will have no such concern.

3

Where can I enable this? Or which API method to use for this?