1. What is the cheapest-fee exchange trading crypto futures for U.S. residents, is it Binance or FTX (with 20X leverage), really confused about the terminologies and fee structure?
I thought leverage trading is not available for US citizens? Are you talking about binance.com or binance.us? Is there leverage trading on binance.us?
Each exchanges have different trading fee, you will need to read the rules regarding trading fee on the exchange you are using. You will use the exchange fee which should be in percentage to calculate the fee that will be deducted.
In 10x leverage, if you have $100, you will have $1000 to trade. If the trading fee is 0.2%, the fee will be $2
$1000 X 0.2% = $1000 X 0.2 ÷100 = $2.
For $1000, 10x leverage which is $10000, it will be $20
Leverage is very risky, use low leverage or stay with spot trading.