What Sei does
Sei is a layer 1 blockchain purpose-built for trading, designed from the ground up around fast transaction ordering and execution rather than being a general-purpose chain retrofitted for finance. Its original pitch centred on 'twin-turbo consensus,' a set of optimisations — including intelligent transaction propagation and optimistic block processing — aimed at delivering sub-second finality well ahead of most general-purpose layer 1s at the time of its 2023 mainnet launch.
The bigger technical leap came with Sei V2 in 2024, which rebuilt the chain as the first parallelised EVM: rather than executing smart contract transactions one at a time like Ethereum and most EVM-compatible chains, Sei processes non-conflicting transactions simultaneously, aiming to combine Ethereum's familiar developer tooling and contract compatibility with throughput and latency that ordinary sequential EVM execution can't match. Sei markets itself heavily on speed claims — sub-400 millisecond finality figures show up regularly in its materials.
What SEI is used for
SEI is the network's gas token, staking asset for proof-of-stake validators, and governance token for protocol-level votes. Its usage case leans hard into on-chain trading infrastructure — perpetuals exchanges, spot DEXs and other latency-sensitive DeFi applications are the natural fit for a chain built around fast, parallel order execution, and Sei has actively courted that category of builder since V2 launched.
Risks
Sei competes in an increasingly crowded field of 'fast chain for trading' layer 1s and rollups, several of which (Solana chief among them, alongside a growing set of high-performance L2s) have stronger existing liquidity, developer mindshare and track records under real market stress. Parallelised EVM execution is also a genuinely difficult engineering problem — conflict detection between transactions touching shared state has to work correctly under adversarial conditions, and any bugs in that logic carry outsized consequences for a chain marketing itself on reliability and speed.
As with most infrastructure tokens, SEI's price has tended to move on ecosystem narrative and speed benchmarks more than on measurable, sustained transaction demand, and token unlocks from early investor and team allocations represent an ongoing supply overhang to watch. Sei's long-term case rests on actually attracting and retaining the high-frequency trading applications its architecture targets — a race it's still running, not one it's won.