Please do not make the same mistake that ETH, Tron, and countless other such chains did. (I tested those some months back, and this was the biggest dogcrap I’ve seen in a long time.)
Their mistake: When sending USDT you also need the base asset (ETH, Tron, etc.) for miner fees (so-called “gas”). In practice this is very tedious to use.
Liquid-BTC (L-BTC, an L2 on top of Bitcoin) took a far better approach: Transactions in USDT-Liquid can take fees also in USDT-Liquid.
Thanks in advance for keeping this in mind during your work. 
Not to mention the “account-based” model of ETH, Tron, and countless other chains, where every incoming transfer goes into the same fixed “account” address. These chains therefore have horrible privacy. I didn’t think this was possible, but they are even worse than L1-BTC, where at least you can generate new addresses and do some coin control.
I hope stablecoins on NPT will, similar to NPT itself, not have any of these issues.