Quick takeSome of the earliest DeFi applications were orderbook-based DEXs (e.g. EtherDelta). The constraints of public blockchains limit the extent to which orderbook functions can be fully decentralized. The high degree of scalability offered by ZK-rollups may facilitate a revival of fully on-chain orderbook DEXs. dYdX and ZigZag are well positioned to lead the way in the space.