Reef, The first cross-chain DeFi operating system. Trade at best price with the liquidity of the entire crypto market. Earn the best return of staking, lending and yield farming automatically. Liquidity problem where the centralized exchanges are isolated and prone to hack while the DEXes have no liquidity and difficult to use. The DeFi ecosystem also faces a fragmentation problem, where users have to manage multiple addresses on multiple platforms, to access their assets and data, they have to navigate to these platforms individually. Reef is a smart liquidity aggregator and yield engine that enables trading with access to liquidity from both CEXes and DEXes while offering smart lending, borrowing, staking, mining through AI driven personalized Reef Yield Engine.