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EVM@sei-js SDKIntroduction

@sei-js SDK

@sei-js is the complete TypeScript SDK for building applications on Sei Network. Whether you’re creating DeFi protocols, NFT marketplaces, or blockchain games, @sei-js provides everything you need to ship faster.

Works with your favorite tools: Sei is fully EVM-compatible, so you can use Viem, Ethers.js, Foundry, Hardhat, and all your existing Ethereum development tools without any changes. @sei-js extends these tools with Sei-specific features like precompiled contracts and optimized wallet connections.

@sei-js is open source. Contribute at github.com/sei-protocol/sei-js .

Why @sei-js?

  • Complete TypeScript support — Full type safety for every function, contract interaction, and API response. Catch errors at compile time.
  • Production ready — Battle-tested components used by major applications in the Sei ecosystem.
  • Optimized for Sei — Take advantage of Sei’s fast finality, low gas fees, and native features.

Package Ecosystem

@sei-js/precompiles

Access Sei’s precompiled contracts directly from your EVM applications. Interact with native blockchain functions for staking, governance, IBC, and more.

npm install @sei-js/precompiles

@sei-js/create-sei

Bootstrap new Sei projects with pre-configured templates and tooling. Scaffold production-ready dApps in seconds.

npx @sei-js/create-sei app

@sei-js/sei-global-wallet

Connect to any Sei-compatible wallet using the EIP-6963 standard. Provides a cross-application embedded wallet experience with social login.

npm install @sei-js/sei-global-wallet

@sei-js/ledger

Secure transaction signing with Ledger hardware wallets. Provides TypeScript helper functions for address derivation and offline Amino signing via the SEI Ledger app.

npm install @sei-js/ledger

@sei-js/mcp-server

Teach Claude, Cursor, Windsurf, or any LLM to interact with the Sei blockchain through the Model Context Protocol.

npx @sei-js/mcp-server

Quick Start

Generate a new Sei application using the CLI tool:

npx @sei-js/create-sei app
cd app
npm install
npm run dev

This creates a production-ready project with TypeScript, wallet connections, and Sei network integration out of the box. See the Scaffold Sei page for details on available templates and options.

Community & Support

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