There is no leverage on AtomicDex, and each trade is actually executed as an Atomic Swap. It is a nice project for the average Joe looking to buy some Altcoin, but it’s not practical for power traders.
Yeah, there is no leverage trading on AtomicDex, but you are saying that you want to use some new blockchain, so there is no way for this to work as fully atomic swaps, and we probably need to trust some third party for this swaps, and that is not trustless.
The $TRADE chain would be an actual standalone blockchain or DAG structure or what have you. But it’s a Smart Contract in the sense that it is aware of things "outside of it" and has specialized logic to interact with these.
It’s also a Smart Contract in the sense that competing instances could co-exist rather peacefully.
DAG is not even a blockchain but more like a spreadsheet, and smart contracts have shown to experimental and buggy, and doing leverage with other altcoins is stupid idea.