What is Sei (SEI)?
Sei (SEI) is a Layer 1 blockchain with a parallelized EVM, designed to process trading and DeFi applications quickly.
Sei launched its mainnet in August 2023 per the Sei Foundation announcement and was originally built on the Cosmos SDK. Sei has focused on cutting processing time and finality so that exchanges and DeFi apps handling heavy order flow run without delay.
Sei aims to be a chain that is fast for trading rather than a do-anything general-purpose chain. Sei's identity rests on that clear goal of serving as an execution layer for speed-sensitive financial apps.
How is Sei so fast? The parallel EVM
Sei raises throughput by processing non-conflicting transactions at the same time, in parallel. Sei's V2 upgrade, launched in July 2024 per Sei Labs, brought parallel execution to an Ethereum-compatible (EVM) environment, so Ethereum apps can be ported with few changes while running faster.
Sei has short time to finality, which suits apps that need instant response such as trading and payments. Sei's Giga upgrade targets 200,000 transactions per second and sub-400ms finality per the Sei Labs roadmap, and these figures are goals rather than achieved performance.
What trading-focused features does Sei have?
Sei drew attention in its early version for building exchange functions such as order matching directly into the chain. Sei later moved to an EVM-centric design and replaced such dedicated modules with base-layer performance, including parallel execution, fast consensus and storage optimization, to support trading apps.
Sei stands apart by making low latency and fast finality, which exchange and derivatives apps require, a design priority for the chain. Trading apps on Sei rely on that base performance to process orders and liquidations more quickly.
What apps are in the Sei ecosystem?
Sei hosts apps that need speed, including decentralized exchanges, derivatives, lending, games and memecoins. Sei has sought to widen its ecosystem since becoming EVM-compatible by attracting Ethereum developers and projects.
Sei's community approved the SIP-3 proposal in May 2025, and Sei then phased out Cosmos and CosmWasm functionality to become an EVM-only chain by mid-2026 per the official docs. Sei's decision improves compatibility with Ethereum tooling but gives up connections to the Cosmos ecosystem such as IBC.
What is on Sei's roadmap?
Sei's roadmap centers on the Giga upgrade, which aims to raise throughput sharply through a new execution client and multi-proposer consensus called Autobahn. Sei introduced the first Giga components with its v6.6 mainnet upgrade in August 2026, according to news reports.
Sei Labs has not fixed a completion date for Giga and says components will ship in phases. Sei's consensus overhaul was reported as still pending as of September 2026, so timelines and performance may change.
What is Sei's supply and what are the risks?
Sei's token (SEI) has a maximum supply of 10 billion per the official docs and is used for network fees, staking and governance. Sei's token allocations for the team, investors and ecosystem unlock on a schedule, which can create supply pressure.
Sei's key question is whether fast technology turns into real usage. Sei faces many rival chains that are fast or trading-active, such as Solana, Arbitrum and Monad, and carries technical risk from large structural changes like the EVM-only transition and Giga.
Sei, like other cryptocurrencies, is highly volatile. This article is for information only and is not investment advice; always make investment decisions at your own responsibility.
