My suggestion is that you should not buy BTC-based cryptos that are of low satoshi value, such as KEY.
You should look at ETH/USDT pairs for example. I am sure you can find more profitable way.
What's different when OP is replacing it with
https://www.binance.com/en/trade/KEY_USDTThe price of USD for such coin depends on the price that already generated by bitcoin pair market and it doesn't affect a lot. But to avoid the volatility and choose USD pair will much better.
BTC pair can be different value than others. Because, it is about rates.
For example;
Assume 1 BTC = $8000,00
10 satoshi= $0,0008
11 satoshi= $0,00088
So if you want to buy a coin worth 11/12 satoshi (1 Million)
You have to pay for it 11 satoshi * 1 million =0,11
BTC And if you want to sell it; you can only get 0,10
BTC (because 10 sats bid, 11 sats asks)
You will start with 80$ loss.
But you can buy this coin with USD pair, $0,00082, and you may sell it $0,00081
So you will start with 10$ maybe less than that.
That is, because the value of Bitcoin is high, the BTC pair and coins with low satoshi value can sometimes be risky. Sometimes it can also be advantageous. We need to evaluate this.
For example, I could always see these and similar differences when trading with BTC in NPXS. I have repeatedly purchased NPXS with ETH pair and sold it with BTC. So I made a significant profit. I think Binance has already removed the BTC pair for this reason.