Yes there are several users trading stable/stable pair. Since it has low risk and some volatility , you can try to catch the movement of stable coin price. But keep in mind to make sure your profit per grid is more than 0.1% since you will be paying fees for buying and selling the tokens. Make sure the spread is wide enough to cover for the fees and some profits so the bot will be profitable. Also usually stable/stable grid bot only use small grid numbers such as 2 or 3.