How it works
Smart-contract execution runs in the TRON Virtual Machine and consumes Energy according to the executed instructions. Read live TRC-20 metadata, ABI signals, recent Transfer activity and the official USDT contract identity.
Quick answer
TRON uses Bandwidth for transaction bytes and Energy for smart-contract computation. USDT TRC-20 transfers are contract calls, so both resources can affect the result and final cost.
Primary sources
Protocol explanations are based on official TRON developer documentation. Live values should always be read from the network.