Can You Cancel a USDT TRC20 Transaction?
The short answer is no, not once it's been successfully broadcast to the network — but there's an important distinction worth understanding.
Once broadcast, it's final
TRON, like essentially all public blockchains, has no mechanism for a sender to cancel a transaction that has already been broadcast and accepted by the network. Given TRON's roughly 3-second block time, there's also very little practical window where a broadcast transaction is sitting uncommitted anyway.
Before broadcasting is different
A transaction you've built in a wallet but haven't yet confirmed sending can obviously just be discarded — that's not really "cancelling" a transaction, it's simply not sending one that was never submitted in the first place.
If you're trying to stop a mistake
If you've realized an error immediately after sending (wrong address, wrong network), there's no cancel button to reach for — the relevant guides on this site cover what's actually possible to do next in each specific scenario.