In short
What a network is
USDT isn't one coin but the same dollar issued on several blockchains. USDT on TRON is called TRC-20, on Ethereum ERC-20, on BNB Chain BEP-20. There's also USDT on TON, Solana and other networks.
To you it looks like one currency with one name, but inside these are different tokens in different systems. TRON knows nothing about what happens on Ethereum. So money sent on one network only goes where the address on that network points.
The main rule: networks must match
When you withdraw USDT from an exchange or wallet, it asks for the network. Choose the network the recipient specified — for example, a payment page says "USDT, TRC-20 network". If you send on a different network, the recipient may not see the transfer at all.
- TRC-20 → TRC-20, ERC-20 → ERC-20. The transfer arrives.
- TRC-20 → an ERC-20 address (or the reverse). The addresses have different formats, and such a transfer usually can't be recovered.
- BEP-20 → an ERC-20 address. Both addresses start with 0x and look the same. If it's your own wallet, the money sits at the same address on BNB Chain: just add that network to the wallet. If it's an exchange or service address that doesn't support BEP-20, you can only get it back through their support — and not always.
What addresses look like
The first characters of an address almost always tell you which network it belongs to.
Note the last column. To send USDT, the wallet must hold the network's own coin to pay the fee: TRX for TRC-20, ETH for ERC-20, BNB for BEP-20. Without it, the transfer simply won't go through. Exchanges deduct the withdrawal fee themselves, so this mainly applies to personal wallets.
Cold wallet (Ledger, Trezor) or any personal wallet: keep a little of the network's coin — TRX, ETH or BNB — on the same network where your USDT sits. Without it you can't move your USDT, and you often can't buy that coin inside a cold wallet: you'll have to send it there from an exchange first.
Which network to choose
- TRC-20 (TRON). The most popular network for USDT: cheap and fast. Most services accept payment on it.
- ERC-20 (Ethereum). Reliable, but the fee can be high, especially when the network is busy. Usually not worth it for small amounts.
- BEP-20, TON, Solana. Cheap alternatives. Fine if both sides support them.
The rule is simple: choose a network the recipient supports, and among those, the cheapest.
A transfer step by step
Beware: address poisoning
There's a common scam. A fraudster creates an address whose first and last characters match an address you recently sent to, and sends you a tiny amount. Their address appears in your transfer history. If you copy the address from history next time, the money goes to the scammer.
Never copy an address from your transfer history. Take it from the original source or your wallet's address book and check it in full, including the middle.
If the mistake has already happened
Common mistakes
Choosing the "default" network
An exchange may suggest the first network in the list while the recipient expects another. Always choose the network manually.
Mixing up BEP-20 and ERC-20
The addresses look the same, so the mistake is easy to miss. Look at the network name, not the address.
Forgetting the memo or tag
Some exchanges ask for a comment or tag when depositing on certain networks (for example, TON). Without it, the deposit may be delayed or lost.
Sending the full amount at once
A test transfer costs pennies; a network mistake can cost the whole amount.