OK, I just want to know if I can keep just enough for the trading and withdrawal fees. For example, if I'm trading BTC>USDC, the fee will be %1 of the traded currency, taken out from the USDC (the currency acquired from the trade). So if 1 BTC is 50,000 USDC, and I traded 0.005 BTC for 250 USDC, they'll take %1 from the 250 USDC, which will be 2.5 USDC. So I'll end up with 247.5 USDC.
But if i use BNB, they say that the fees will be reduced (to %0.5 I think it was). So in the above example trade, they'll take out 1.25 instead of 2.5, but they will not take it from the USDC, but rather the BNB in my wallet.
Is the above correct? Did I understand how it works correctly? If yes, then...
1) Is it %0.5 of the BNB's exchange rate from the 250 USDC? So for example, if 1 BNB is 500 USDC, does it mean they will take out 0.0025 BNB? (1 USDC = 0.0020 BNB so 1.2 USDC would be 0.0025 BNB).
2) Can I buy enough BNB to keep in my wallet for just the transaction fee I want? Taking the above example, if I wanted to make that trade in an hour, and I currently have zero BNB in my wallet, can I go ahead and buy 0.0025 BNB just for the purpose of saving on fees for that transaction? Does it work that way?
Indeed, they will be taking BNB from your Binance wallet as fee, not BTC or USDC. If you have BNB and this feature is enabled (afaik it is by default)
1. The fees are (10x) smaller than you wrote and BNB also doesn't help
that much. (25% instead of 50%)
The fees are 0.1% (not 1%) and with BNB it's 0.075% (not 0.5%).And I don't know 100% what conversion rate they use for BNB, sorry, I don't trade large amounts so it doesn't matter that much for me. It's probably the spot price.
Maybe you find more
in their help pages.
2. I don't see why not. That's basically what I do, although I don't really "buy BNB" for this, instead I convert into BNB the small amounts now and then.