Sei was founded by Jay Jog and Jeff Feng and launched mainnet in August 2023, initially as a Cosmos SDK-based chain with trading-specific optimisations. Sei V2 (launched 2024) represented a major architectural pivot: adopting full EVM compatibility while retaining and extending Sei's performance optimisations. The V2 evolution made Sei a parallelised EVM chain — capable of executing EVM smart contracts at significantly higher throughput than standard sequential EVMs like Ethereum, by processing non-conflicting transactions simultaneously across multiple CPU cores. The combination of EVM compatibility (meaning all Ethereum tooling, wallets, and Solidity contracts work natively) with parallel execution performance (400ms blocks, 28,000+ TPS theoretical throughput) positioned Sei as a direct competitor to both traditional EVM chains and high-performance non-EVM L1s like Solana.
Sei V2: Parallelised EVM Architecture
Sei V2's parallel EVM uses optimistic concurrency control — similar to Aptos's Block-STM — but applied to EVM execution. Transactions within a block are speculatively executed in parallel across multiple threads. The EVM state is monitored for conflicts (two transactions reading and writing the same storage slot). When a conflict is detected, the conflicting transaction is re-executed. For workloads where most transactions are independent (different users interacting with different contract instances), near-linear throughput scaling with CPU core count is achievable. Sei's additional optimisation: SeiDB — a custom storage layer designed to replace Ethereum's standard Merkle Patricia Trie (which is notoriously slow for large state sets) with a more cache-efficient data structure. SeiDB provides significant I/O performance improvements for state-heavy applications. Together, parallel EVM and SeiDB allow Sei to achieve sub-400ms block times (compared to Ethereum's 12-second blocks or Arbitrum's ~250ms) while maintaining full EVM equivalence.
Twin Turbo Consensus and Native Order Matching
Sei's original Cosmos SDK version introduced "Twin Turbo Consensus" — a modified Tendermint BFT with two optimisations: optimistic block processing (validators optimistically start processing the next block before the current one is finalised, reducing latency) and intelligent block propagation (only propagating the block hash initially, with full block data sent only to validators who request it, reducing bandwidth overhead). These optimisations remain in Sei V2, contributing to the sub-second block finality. Sei V1 also introduced a native order book module at the protocol layer — similar to Injective's approach — allowing DEXes to use chain-level order matching rather than AMM pool contracts. Sei V2's focus shifted to EVM parallel execution, but the native order book remains accessible to EVM contracts via precompiles, enabling hybrid AMM/order book DEX designs.
Sei DeFi Ecosystem
Following V2's EVM launch, Sei attracted several DeFi protocols: DragonSwap (native V3-style DEX, largest TVL), Yei Finance (Aave V3 fork deployed on Sei), and several perp DEXes leveraging Sei's speed advantage. Sei also hosts significant NFT activity — the Seipex and Atlantic Opal collections built communities around Sei's early userbase. The EVM compatibility has enabled migration or deployment of Ethereum-native protocols to Sei without code changes — accelerating ecosystem growth compared to non-EVM chains that require protocol rewrites. Sei's DeFi TVL remains smaller than Ethereum, Arbitrum, or Solana, but growing as the V2 ecosystem matures.
SEI Investment Case
SEI's investment thesis: one of the few EVM chains with genuine performance advantages over both Ethereum mainnet and the current OP Stack/Arbitrum rollup generation, targeting the specific use case (trading and DeFi) where performance differences matter most. SEI staking yields approximately 5–8% APY. The risks: EVM L1 competition is exceptionally crowded — Solana is faster for non-EVM use cases, and ZK-rollups on Ethereum will eventually achieve high throughput. SEI needs to build a sticky DeFi ecosystem before competitive moats are established, and the large initial insider allocations (investors and team hold ~48% of tokens with multi-year vesting) create ongoing sell pressure during unlock periods. The differentiation that matters most for SEI: whether the 400ms + parallel EVM + SeiDB combination delivers demonstrably better user experience for high-frequency DeFi than competitors — and whether that advantage compounds into network effects before faster competitors catch up.
Sei V2: Parallelized EVM for High-Performance Trading
Sei V2 introduced optimistic parallelization to the EVM — Sei executes all transactions in parallel by default and only reverts to sequential execution for transactions that conflict with each other. Unlike other parallelization approaches that require developers to pre-declare transaction dependencies, Sei's optimistic parallelization is fully transparent to developers: existing Solidity contracts deploy on Sei V2 without modification and automatically benefit from parallelization where transactions don't touch the same state. This approach makes Sei EVM-equivalent while achieving throughput well beyond standard sequential EVM chains.
Sei's twin-turbo consensus combines optimistic block processing (processing transactions before full consensus finalization) with intelligent block propagation to achieve 390ms finality — among the fastest finality times of any EVM-compatible chain. For trading applications where latency determines execution quality, Sei's sub-400ms finality allows limit order books to function competitively against centralized exchange matching engines. The combination of Cosmos SDK foundations (IBC connectivity) and full EVM compatibility makes Sei accessible to both the Cosmos and Ethereum developer ecosystems simultaneously.
Sei's native order book module provides a built-in on-chain order book infrastructure that applications can use without building custom matching logic — reducing development complexity for DEX builders and enabling more sophisticated order types than AMM models support. Sei's architecture is specifically optimized for financial primitives: order matching, margin calculations, and settlement operations are first-class protocol features rather than bolt-on smart contract implementations. SEI trades on Coinbase, Binance, Bybit, and OKX. Use our crypto tools for SEI analysis and our DennTech blog for Sei network updates.
Sei's EVM compatibility layer (SeiEVM) maintains full state isolation between the EVM environment and Sei's native CosmWasm environment while allowing tokens to move between them through a bridge — developers can deploy Solidity contracts on SeiEVM using MetaMask and standard Ethereum tooling while benefiting from Sei's parallelized execution and twin-turbo consensus speed. This dual-VM architecture allows Sei to attract both Cosmos ecosystem developers building with CosmWasm and Ethereum developers deploying existing Solidity contracts, providing a migration path for protocols from both ecosystems without requiring rewrites. The combination of EVM compatibility, native order book infrastructure, sub-400ms finality, and IBC connectivity makes Sei uniquely positioned for financial applications that require both Ethereum ecosystem compatibility and performance levels that standard EVM chains cannot achieve.