DeFi crypto margin trading refers to the practice of using borrowed funds from a broker to trade a financial asset, which forms the collateral for the loan from the broker. Usually broker in DeFi it’s one of autonomous money markets.
GMX is a decentralized spot and perpetual exchange that supports low swap fees and zero price impact trades and let you trade top cryptocurrencies with up to 30x leverage directly from your wallet.
Gearbox Protocol is essentially a two-sided lending marketplace: it connects users who want passive safe APY & leverage degens who know how to make more with leverage and alpha.
dYdX is a trading platform for crypto assets, built with open-source protocols, enabling decentralized margin trading. dYdX - Decentralized Platform for Advanced Financial Products, interview with Antonio Juliano
Perpetual Protocol is a decentralized perpetual contract protocol with virtual AMMs to provide guaranteed liquidity.