What you actually pay
Deposit USDT on BEP20 and withdraw on TRC20. That is $1 of blockchain fee instead of $3. Two numbers exist and you see both before anything moves: the network fee, already inside the amount you send, and the wallet's service fee, shown as its own line on the confirmation screen. Nothing is deducted after the fact and no balance is required in a coin you did not want to hold.
The network fee is inside the amount
Every chain charges for a transfer in its own coin. Instead of asking you to keep that coin, the wallet pays it out of the operation and quotes you a single figure in the token you are sending. A route that would normally require gas on both chains still costs you one amount, in one asset.
The service fee is 0.25%
The wallet charges 0.25% of the amount you move: one rate, the same for every account. It is shown as its own line on the confirmation screen beside the amount that will arrive: you approve both together or neither, and the number never changes after you have agreed to it.
A worked example
Deposit on BEP20, withdraw on TRC20: $1 of network fee instead of $3. The figure is quoted before you sign, for the amount you entered.
Quotes expire
A quote is priced against live routing, so it is valid for a few minutes and then has to be refreshed. An expired quote is never signed silently. The wallet asks for a new one and shows you the new number.
Read next
Several wallets in one account, unlinked on-chain
Hold as many wallets as you need inside one Telegram account. Their addresses are not linked on-chain, so paying from one tells nobody about the others. Send to a @username or to any address.
Questions
Do I need the network coin to pay a fee?
No. The network fee is charged inside the operation, in the token you are sending.
Is anything deducted after the transfer?
No. The amount that arrives and the service fee are both shown before you sign, and neither changes afterwards.
How much is the service fee?
0.25% of the amount moved, the same for every account. The network fee is separate and already inside the amount you send.
What does USDT BEP20 to TRC20 cost?
Deposit on BEP20, withdraw on TRC20: $1 of network fee instead of $3.