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Welcome to @sei-js
A TypeScript SDK for building decentralized applications on Sei
rocket

Build on Sei

@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.

Build your first Sei app in under 10 minutes Help improve @sei-js and contribute to the project

Why @sei-js?

Full type safety for every function, contract interaction, and API response. Catch errors at compile time. Battle-tested components used by major applications in the Sei ecosystem. Take advantage of Sei's fast finality, low gas fees, and native order matching.

Package ecosystem

**Native blockchain function access** 
Access Sei's precompiled contracts directly from your EVM applications.

```bash
yarn add @sei-js/precompiles
```
**Project scaffolding and templates** 
Bootstrap new Sei projects with pre-configured templates and tooling.

```bash
npx @sei-js/create-sei app
```
**Universal wallet connections** 
Connect to any Sei-compatible wallet using the EIP-6963 standard.

```bash
yarn add @sei-js/sei-global-wallet
```
**Hardware wallet integration** 
Secure transaction signing with Ledger hardware wallets.

```bash
yarn add @sei-js/ledger
```
**LLM blockchain integration** 
Teach Claude, ChatGPT, or any LLM to interact with the Sei blockchain.

```bash
npm install -g @sei-js/mcp-server
```
🤖 **Teach Your LLM About Sei**

Connect Claude, ChatGPT, or any LLM to the Sei blockchain with @sei-js/mcp-server. Your AI assistant can check balances, transfer tokens, deploy contracts, and guide users through the entire @sei-js ecosystem.

Get Started with MCP →

Community & Support

Report Issues

  • GitHub Issues - Report bugs and request features
  • Include reproduction steps and environment details
  • Check existing issues before creating new ones