The idea of using Automated Market Maker (AMM) to build a decentralized exchange (DEX) was proposed for the first time in 2016. Two years later, the earliest form of the idea, named Uniswap, was launched in November 2018. However, traffic on Uniswap was quite low for the first three years. Its liquidity finally reached one billion US Dollars for the first time in August 2020. Nowadays, Uniswap has become a key component of the Decentralized Finance (DeFi) market that leverages numerous DeFi applications and builds up a robust DeFi ecosystem.