TRC-20 Versus ERC-20: What Sending USDT on the Wrong Network Costs
Tether is one token with one price and at least a dozen different sets of rails underneath it. The two that matter most in daily use are ERC-20, which is USDT issued on Ethereum, and TRC-20, which is USDT issued on Tron. They are worth the same dollar. They are not the same asset in any technical sense, and a transfer that ignores the difference does not politely bounce back.
What the standard actually is
ERC-20 and TRC-20 are token specifications: a short list of functions that a contract must expose so that wallets and exchanges know how to move balances. Tether deploys a contract on each chain and issues supply against it.
The consequence is that your USDT balance is a row in a specific contract on a specific blockchain. There is no global Tether ledger that reconciles across chains. Moving between them means going through Tether itself or through a bridge, not through a normal send.
The fee difference, and why it flips
Ethereum charges gas in ETH, priced by network demand. A USDT transfer might cost under a dollar during a quiet weekend and considerably more during a busy period. You also need ETH in the wallet to pay the crypto, which surprises people who hold only USDT and then discover they cannot move it.
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