USDT on TRC20 or ERC20: which should you use?
The same USDT exists on several networks, and picking the wrong one costs money or loses the transfer. Here is how TRC20 and ERC20 differ in fees, speed and risk.
USDT is not one thing. The same token is issued on several different blockchains, and each version only moves on its own network. TRC20 USDT lives on Tron. ERC20 USDT lives on Ethereum. They are worth the same dollar, but they are not interchangeable in transit.
This is the single most common and most expensive mistake people make when sending stablecoins, so it is worth five minutes to get right.
The practical difference: fees
On Tron, sending USDT typically costs a fraction of a dollar, and sometimes nothing at all if your account has enough bandwidth and energy staked. On Ethereum, the same transfer costs whatever the network is charging that moment — usually a few dollars, occasionally far more when the network is busy.
For most people moving everyday amounts, that difference decides it. Sending $50 of USDT over Ethereum and paying $8 in gas is a bad trade. Over Tron it is cents.
The practical difference: speed
Tron blocks are produced every three seconds and a transfer is usually final within a minute. Ethereum blocks come every twelve seconds, and while a transfer often confirms quickly, a low fee can leave it pending for a long time.
When ERC20 is still the right choice
If you are sending to a service that only accepts ERC20, use ERC20. Compatibility beats cost every time — a cheap transfer to a network the recipient cannot receive on is not cheap, it is gone.
ERC20 also makes sense if the funds are headed into Ethereum DeFi, because they need to be on Ethereum to be useful there.
The rule that actually protects you
Match the network to the address you were given, never to your preference. A deposit address belongs to exactly one network. A Tron address starts with T. An Ethereum-network address starts with 0x. They are not alternative spellings of the same destination.
If you send TRC20 USDT to an 0x address, or ERC20 USDT to a T address, the transfer does not bounce back. It is simply gone, and no support team can reverse a blockchain.
In BYCRYPTO, open Receive, choose the coin and network you are actually sending, and use the address shown for that exact combination. The page tells you which network each address belongs to for this reason.