What is Sei? Sei is a layer-1 blockchain built for fast trading, decentralized finance, stablecoins, payments, and other applications requiring rapid settlement. Its native token is SEI, used for transaction fees, staking, governance, and ecosystem incentives.
Core technology and architecture
Sei combines Ethereum Virtual Machine compatibility with parallel transaction execution. Developers can use Solidity, Vyper, Foundry, Hardhat, viem, and ethers, allowing Ethereum-based applications to deploy with limited changes while using Sei’s execution and consensus optimizations.
The network’s parallelization engine processes independent transactions concurrently across multiple CPU cores. It estimates transaction read and write sets, executes transactions optimistically, identifies conflicts, and re-executes conflicting transactions when required. This design is intended to improve performance for transfers, order-book activity, and DeFi applications.
Sei’s Twin-Turbo Consensus consists of optimizations to a Tendermint-based Byzantine Fault Tolerant system. Optimistic block processing allows nodes to begin handling transactions before consensus is fully complete, while intelligent block propagation is designed to reduce network delays. Official materials describe the current architecture as targeting sub-400-millisecond finality.
SeiDB is a specialized database optimized for EVM state access. It uses caching, concurrency controls, and state prefetching to reduce storage bottlenecks during parallel execution.
Primary use cases and applications
Sei was originally designed around decentralized trading and exchange infrastructure. Its applications include spot markets, order-book exchanges, automated market makers, lending, borrowing, derivatives, perpetual markets, cross-chain liquidity, and yield strategies.
Stablecoins are another major use case. USDT0 was integrated on Sei in April 2025 for trading, lending, payments, and cross-chain transactions. Circle Ventures also made a strategic investment supporting USDC-related use cases. In February 2026, Toku integrated Sei into a payroll platform supporting stablecoin payments, corporate remittances, and settlement for employees and vendors.
The ecosystem has expanded into institutional finance, tokenized assets, gaming, consumer applications, and AI-related activity. Morpho Vaults V2 went live on Sei in March 2026, while Yei Finance launched a cross-chain lending testnet with Sei positioned as a clearing layer.
Who is behind Sei and where is it based?
Sei Labs was founded in 2022 by Jeff Feng and Jayendra Jog. Feng previously worked at Goldman Sachs and Coatue Management, while Jog was an engineer at Robinhood. Official materials describe Sei Labs as a software provider and major contributor to the open-source Sei blockchain, separate from the Sei Foundation and Sei Development Foundation.
The broader team has been described as including professionals with backgrounds at Goldman Sachs, Databricks, Robinhood, Google, and Nvidia. Crunchbase identifies Sei Labs Inc. as headquartered in New York, United States.
The Sei Development Foundation was established in April 2025 as a U.S.-based 501(c)(4) nonprofit headquartered in Manhattan, New York City. Its role is to support the growth and adoption of the protocol. The reviewed sources confirm its U.S. nonprofit status and headquarters but do not establish a specific state of incorporation.
Consensus and network security
The current network uses delegated proof of stake on a Tendermint-derived Byzantine Fault Tolerant framework. Validators propose and validate blocks, while holders delegate SEI to validators to increase their voting weight and receive staking rewards.
Network security depends on the economic value of staked tokens, validator participation, validator diversity, and correct consensus operation. Staking includes an unbonding period and slashing risk. Sei Giga is expected to introduce Autobahn BFT consensus and a multi-proposer architecture in a later development phase.
Tokenomics and supply
SEI has a capped total supply of 10,000,000,000 SEI and a circulating supply of 6,733,333,333 SEI. Official tokenomics materials state that 51% of the supply was allocated to the community, with the Ecosystem Reserve representing 48% of total supply. The Foundation Treasury received 9%, while Launchpool and Season 1 rewards each represented 3% categories in the published allocation structure.
The remaining supply includes allocations for investors, contributors, foundation activities, and other launch-related purposes. The reviewed primary sources do not provide a complete, unambiguous breakdown of every category or detailed vesting schedule.
Supply enters circulation through scheduled vesting, ecosystem distributions, and staking-related rewards. The sources do not establish a fixed annual inflation rate or a universal fee-burning mechanism. Therefore, SEI is not confirmed as structurally deflationary.
Partnerships and competitive advantages
Notable ecosystem relationships include Circle Ventures, USDT0, Toku, Morpho, Yei Finance, Jumper, Kraken, Binance, KAIO, and Hamilton Lane. A Hamilton Lane tokenized fund also went live on Sei through KAIO.
Sei’s main advantage is its combination of EVM compatibility and trading-focused infrastructure. Parallel execution, fast finality, optimized storage, and Ethereum development tools are intended to give applications efficient settlement without requiring developers to abandon familiar workflows. The principal trade-off is the planned reduction of legacy Cosmos and CosmWasm functionality as the network moves toward an EVM-only architecture.
Development roadmap
SIP-3 is consolidating Sei around EVM execution. The transition includes migrating assets and wallets toward EVM addresses, deprecating new CosmWasm deployments, integrating staking through the EVM, and gradually removing native Cosmos transaction functionality.
Sei Giga is the longer-term redesign. Its planned components include Autobahn consensus, multi-proposer data lanes, asynchronous execution, a redesigned EVM client, optimistic parallelism, and improved storage. The July 2026 Giga Whitepaper V2 set development targets of sub-250-millisecond finality, 200,000+ transactions per second, and 5 gigagas per second. These are roadmap targets, not current mainnet performance figures.