Supercharge your LLMs

Connect AI assistants to Sei blockchain with natural language commands for token transfers, smart contract interactions and deployments, and more.

Perfect For

Developers, Vibe Coders, DeFi users, NFT collectors, and anyone wanting to interact with Sei through natural language interfaces.

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Quick Start

Secure by Default: The MCP server runs in read-only mode by default. Wallet tools are disabled until you explicitly configure a private key.

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Basic Setup (Read-Only)

Start with read-only blockchain data access: 
{
  "mcpServers": {
    "sei": {
      "command": "npx",
      "args": ["-y", "@sei-js/mcp-server"]
    }
  }
}

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Full Setup (With Wallet and RPC Configuration)

Advanced Configuration: For wallet setup and custom RPC endpoints, see the Environment Variables section in the setup guide.
{
  "mcpServers": {
    "sei": {
      "command": "npx",
      "args": ["-y", "@sei-js/mcp-server"],
      "env": {
        "WALLET_MODE": "private-key",
        "PRIVATE_KEY": "YOUR_PRIVATE_KEY",
        "MAINNET_RPC_URL": "https://evm-rpc.sei-apis.com",
        "TESTNET_RPC_URL": "https://evm-rpc-testnet.sei-apis.com",
        "DEVNET_RPC_URL": "https://evm-rpc-arctic-1.sei-apis.com"
      }
    }
  }
}

Complete Setup Guide

Follow our step-by-step installation guide for Claude Desktop, Cursor, Windsurf, and custom integrations.
Running into issues? If you encounter “‘fetch’ is not defined” errors or Node.js version conflicts, check out our troubleshooting guide for solutions to common setup problems.

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What is MCP?

The Model Context Protocol is an open standard that connects AI systems with custom prompts, tools and data sources (context). It enables:
  • Real-time blockchain data access - Get current balances, transaction history, and network status directly from Sei
  • Secure by default - Runs in read-only mode until you explicitly enable wallet tools
  • Full execution and write operations - Deploy contracts, execute transactions, and interact with smart contracts (with wallet configured)
  • Up-to-date documentation access - Search both main Sei docs and Sei-JS package documentation for comprehensive guidance
  • Specialized blockchain capabilities - Access Sei-specific features like precompiles and native token operations
The Sei MCP Server leverages this protocol to bring comprehensive blockchain functionality directly to your AI assistant, enabling natural language interactions with the Sei network.

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Why Use Sei MCP Server?

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Example Queries

"How do I bridge tokens to Sei from Ethereum?"
"How do I query staking my delegations using Viem?"
"Generate a wallet connection component using Sei Global Wallet"
"Help me set up a new Sei project with the latest patterns"

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Code Generation

The AI generates accurate, production-ready code using official @sei-js patterns:
  • Uses correct package imports and APIs
  • Follows documented best practices
  • Includes proper error handling
  • References current version patterns
The Sei MCP Server is actively developed with new features added regularly. Current version supports core blockchain operations with advanced DeFi integrations planned.