@OP, I know you from the Lending board as a known spammer, but then, that is not the reason why i am replying to this thread.
If you are so dumb not to understand or know why you are called or tagged as a scammer, then take a look at the information below...
This is your currency exchange post..
I want to exchange 100 USTC (US Terra) for USDT.
100 USTC = 100 USDT, so you get 100 USTC. I prefer USDT only TRC20, but am willing to get other crypto - BTC, TRX
You want to exchange 100 USTC for 100 USDT.....Are you for real ?
below is the current price of 1 USTC

And here is 100 USTC worth in USDT

I believe you know all this already, how then do you want to sell/exchange 100 USTC for 100 USDT if you are not a scammer?