When it comes to trading crypto on decentralized exchange, there are not a lot of choices. GMX, Gains Network, and dYdX are the choices that I'm aware of. Unlike other decentralized exchanges they use order books system which allow for lower fees than bounding curves-based DEXes. Additionally, all 3 of those offers margins to short and go long which is very important for traders.
There are slight differences between all 3 of those, for example the margin leverage available (GMX up to 50X, dYdX 20X, Gains up to 150X), the crypto-currencies available (Gains has 91 pairs listed, GMX 4 pairs, dYdX 37 pairs), and the fees (dYdX no fees at the moment, Gains @ 0.08%, GMX 0.1%). Daily trade volume is $41M on Gains, $65M on GMX, and $400M non dYdX.
Overall, if you are a trader, dYdX is worth a look. Show Less