USDT is a stablecoin on different blockchains. When making transactions in USDT, the network commission is deducted from the coin on the blockchain which costs the USDT you need. And in order to be able to use stablecoins, you need to activate the blockchain of the USDT you need:
· For USDT (TRC20) is TRX (TRON) coin
· For USDT (ERC20) these are ETH (ETHEREUM) coins
For activation, it is necessary to replenish the balance of the blockchain coin.