What is a bitcoin wallet address: the short version
Whoever asks "What is a bitcoin wallet address?" is really asking what a coin costs and how long it takes to move. USDT transfer fees come in two layers: the network fee, paid in the coin of the network the transfer uses, and any withdrawal charge an exchange adds on top. On TRON the fee is covered by energy and bandwidth or by burning TRX, on BNB Smart Chain it is paid in BNB and on Ethereum in ETH gas. The cheapest way to send USDT is usually the network both sides support with the lowest total charge at the time.
How to convert BNB to USDT depends on where the BNB sits. On an exchange, a convert or trade screen sells BNB for USDT and shows the price and fee before confirming. From a wallet the owner controls, a decentralised exchange performs the swap on chain, with the network fee paid in BNB, and the price filled can differ from the quote through slippage. The USDT contract address should match the one published by official sources, because a name and symbol are easy to copy. Keeping a little BNB back covers later fees.
How long does a USDT transfer take? On TRON it usually lands within minutes, while on Ethereum the time follows congestion and the fee paid; no network keeps a fixed schedule. Part of every wait is confirmations. Blockchain confirmations are the count of blocks from the one holding a transaction up to the newest: the block that includes it is the first, and each later block adds one. More blocks make a reversal harder, so the receiving platform waits for its own number, often between one and six for bitcoin, before crediting the balance.
Asked about this
When should a seller release USDT to a buyer?
Only once the money shows in the bank account itself; screenshots and messages claiming payment are easy to fake.
Who is paid the network fee on a USDT transfer?
The network, in its own coin: TRX or energy and bandwidth on TRON, BNB for BEP20, ETH gas for ERC20; an exchange may add a withdrawal charge of its own.
Why match the USDT contract address before a swap?
Anyone can create a token with the same name and symbol, so only the contract address from official sources identifies the real one.
Where does an exchange show its withdrawal charge?
On the withdrawal screen, before the transfer is confirmed, next to the network chosen; reading it there avoids surprises.