Sei

Sei is a high-performance Layer 1 blockchain specifically optimized for trading and exchange applications. Originally built on the Cosmos SDK, Sei evolved through multiple versions to become the first parallelized EVM (Ethereum Virtual Machine) blockchain, combining Ethereum compatibility with dramatically higher throughput. Sei V2, launched in 2024, introduced parallel execution of EVM transactions, enabling the chain to process multiple transactions simultaneously rather than sequentially — a significant advancement over traditional EVM chains.

The network achieves sub-400-millisecond block times and finality, making it one of the fastest blockchains in production. Sei's architecture includes a built-in order matching engine, native price oracles, and front-running protection mechanisms, all designed to make decentralized exchange applications as performant as possible. The chain supports both EVM (Solidity) and CosmWasm smart contracts, giving developers flexibility in how they build.

Sei's parallelized execution model processes independent transactions simultaneously across multiple threads, dramatically increasing throughput compared to sequential processing chains. This means that a DEX trade and an NFT mint happening at the same time don't compete for the same processing resources. Combined with optimistic concurrency control and its twin-turbo consensus mechanism, Sei delivers a trading experience that rivals centralized exchanges in speed while maintaining decentralization and permissionlessness.