Sei (SEI) is a layer 1 blockchain designed for trading and other high speed financial applications. It uses parallel processing to run many transactions at the same time, with finality in under a second, and it is compatible with Ethereum smart contracts. Sei's mainnet launched in August 2023, and the network has focused on order matching, DeFi and payments. SEI is the native token, used to pay fees, to stake and to take part in governance. Developers can build on Sei using familiar Ethereum tools while benefiting from its speed.