The label names a network
Tether issues USDT separately on each blockchain it supports and publishes that list itself (Tether). ERC-20 is Ethereum’s standard for fungible tokens (ethereum.org); BEP-20 is the BNB Smart Chain equivalent, written by deriving the ERC-20 interface (BNB Chain); TRC-20 is the TRON version. A balance held under one of them cannot be seen or spent under another: separate ledgers, separate contracts.
They do not even agree on their own arithmetic. A token contract publishes how many decimal places it uses, and anyone can ask it without a wallet or an account. Asked directly, the contracts on Ethereum and on TRON both answer six; the one on BNB Smart Chain answers eighteen. All three call themselves Tether USD. A wallet hides this by rounding for display, which is exactly why it surfaces later — in a script that assumed one number, or in an amount typed out by hand from one screen into another.
What actually differs
The fee, and what it is paid in. Gas on Ethereum has to be paid in ether (ethereum.org). BNB Smart Chain is EVM-compatible and its fee goes to validators in BNB (BNB Chain). TRON works differently again: a transaction consumes bandwidth and energy, which an account obtains by staking TRX, and when those run short the network burns the sender’s TRX to cover the difference (TRON Protocol).
The address. Ethereum and BNB Smart Chain share one hex format, so the same address exists on both and only the network chosen at send time decides where the funds land (MetaMask Help Center). TRON addresses are Base58 strings beginning with T, and a TRON account has to be activated before it can hold anything (TRON Protocol).
What the wallet has to support. When a token fails to appear after a transfer, check the network before assuming it is lost: BNB Chain’s own troubleshooting starts by checking that the wallet is on the network the token was sent on, then adding the token by its contract address (BNB Chain).
Converting is really transferring
No operation turns TRC-20 USDT into ERC-20 USDT. What gets called converting is moving value from one network to another, and there are two ways to do it: a bridge, in a single transaction, or an exchange — deposit on one network, withdraw on another. What each costs changes through the day, so the only useful number is the one from the moment you send. The tool below prices TRON to Ethereum; for the other directions there are Ethereum to TRON and BNB Chain to TRON.
Choosing a network
Withdrawing from an exchange, the choice is made on the withdrawal screen, and it is only useful if the receiving wallet or service supports that network — a cheaper network is no help if the destination cannot accept it. Sending to another person or a service, their address decides for you: it already belongs to one network, and matching it is the whole job.
Questions
What is USDT ERC-20?
USDT issued on Ethereum, where ERC-20 is the standard that fungible tokens follow. Tether names Ethereum on its own published list of protocols, the balance is kept on a ledger separate from every other network, and moving it is paid for in ether.
What is the difference between USDT ERC-20 and TRC-20?
The network they live on. ERC-20 USDT sits on Ethereum, with hex addresses and fees paid in ether; TRC-20 USDT sits on TRON, where addresses are Base58 strings beginning with T and a transaction spends bandwidth and energy instead. The balances are separate, so getting from one to the other means a bridge or an exchange.
Is USDT on BNB Smart Chain the same token as on Ethereum?
It is a separate balance with its own contract, and it does not use the same arithmetic: the contract on BNB Smart Chain reports eighteen decimal places where Ethereum and TRON report six. All of them call themselves Tether USD. Who issues the one on BNB Smart Chain we could not confirm from a primary source, so we do not claim it either way.
Is USDT ERC-20 or TRC-20 cheaper to send?
Neither, as a rule — the standard does not set the price, the state of the network and the route do, and which one is cheaper changes through the day and with the amount. That is the whole reason this site asks every provider the same question at the same moment instead of publishing a table of typical costs.
Sources
- Tether — supported protocols · checked 2026-09-12
- ethereum.org — the ERC-20 fungible token standard · checked 2026-09-12
- ethereum.org — gas and fees · checked 2026-09-12
- BNB Chain — BEP-20 token standard · checked 2026-09-12
- BNB Chain documentation — BNB Smart Chain introduction · checked 2026-09-12
- BNB Chain documentation — tokens not showing in a wallet · checked 2026-09-12
- TRON Protocol documentation — accounts, address format and activation · checked 2026-09-12
- TRON Protocol documentation — bandwidth and energy · checked 2026-09-12
- MetaMask Help Center — the Ethereum address format and why it matters · checked 2026-09-13