None at the moment. All tron transaction are paid in Tron and you can only pay lesser fees when you stake a huge amount of tron. transaction on Tron are costly expect you buy gas by staking tron.
I don't wanna stake any tron, just wanna do my transaction and be done with this blockchain, Tron is famous for feeless/low fee transactions but it's not the case in reality.
It is the case in reality. Tron transfers ~3 per day are completely free. You do not have to pay any fee. If you want to exchange/transfer Tether USDT TRC20 via TRON network, it will costs ~30 TRON. It is not to possible to exchange Tether USDT, and pay in USDT, you can not transfer.