Quickstart

Cursor IDE
Windsurf
Claude Desktop
Claude CLI
Remote Servers (http)

Open Settings

Navigate to Cursor → Settings → Cursor Settings → MCP

Cursor → Settings → Cursor Settings → MCP

Configure Server

Click “Add new Global MCP server” and add this configuration to mcp.json:

{
  "mcpServers": {
    "sei": {
      "command": "npx",
      "args": ["-y", "@sei-js/mcp-server"]
    }
  }
}

Restart

Restart Cursor to activate the MCP server. You’ll see a notification when it’s ready.

Open Settings

Navigate to Windsurf → Settings → Windsurf Settings → Cascade

Windsurf → Settings → Windsurf Settings → Cascade

Add Configuration

Add the Sei MCP Server to your configuration:

{
  "mcpServers": {
    "sei": {
      "command": "npx",
      "args": ["-y", "@sei-js/mcp-server"]
    }
  }
}

Activate

Save and restart Windsurf. The server loads automatically.

Install Claude

Download Claude Desktop from Anthropic.

Edit Configuration

Open Settings → Developer → Edit Config and add:

{
  "mcpServers": {
    "sei": {
      "command": "npx",
      "args": ["-y", "@sei-js/mcp-server"]
    }
  }
}

Restart

Save and restart Claude Desktop to enable Sei tools.

Remote MCP Servers: Claude Desktop also supports connectors for remote HTTP servers. If you want to use a remote Sei MCP server instead of running it locally, set up the server using the Remote Servers (http) tab above, then add a connector configuration instead of the local server setup.

Install CLI

npm install -g @anthropic-ai/claude-code

Add Server

# Read-only mode (default)
claude mcp add sei-mcp-server npx @sei-js/mcp-server

# Wallet-enabled mode
claude mcp add sei-mcp-server-wallet npx @sei-js/mcp-server --env WALLET_MODE=private-key PRIVATE_KEY=0x123...

Start Session

claude

The Sei MCP Server activates automatically in your session.

The Sei MCP Server can be run as a standalone HTTP server via the streamable-http transport.

Start HTTP Server

Launch the MCP server with streamable-http transport:

# Basic API setup (port: 8080, path: /mcp)
SERVER_TRANSPORT=streamable-http npx @sei-js/mcp-server

Or with custom configuration:

# Custom port and path
SERVER_TRANSPORT=streamable-http \
SERVER_PORT=3001 \
SERVER_PATH=/api/sei \
SERVER_HOST=0.0.0.0 \
npx @sei-js/mcp-server

Verify Server

The server will output:

EVM MCP Server initialized for networks: sei, sei-devnet, sei-testnet
MCP Server ready (streamable-http transport on localhost:8080/mcp)

Test with curl

Test the API endpoint with curl:

# List available tools
curl -X POST http://localhost:8080/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/list"
  }'

# Get latest block info
curl -X POST http://localhost:8080/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{
    "jsonrpc": "2.0",
    "id": 2,
    "method": "tools/call",
    "params": {
      "name": "get_latest_block",
      "arguments": {
        "network": "sei"
      }
    }
  }'

Verification

After setup, verify the server is working by asking your AI assistant:

Test Connection

Ask: “What Sei tools are available?”You should see a list of available blockchain tools.

Test Read Operations

Ask: “What’s the latest block on Sei?”This tests basic blockchain connectivity.

Test Wallet (Optional)

If you configured wallet access (see environment variables for setup):Ask: “What’s my wallet address?”This confirms wallet tools are enabled.

Next Steps

Environment Variables

Configure wallet access and custom RPC endpoints

Available Tools

Explore 50+ blockchain tools and capabilities

Troubleshooting

Solutions to common setup and configuration issues

Context & Prompts

Learn how to effectively interact with the server

About

Setup

Capabilities

Verification

Next Steps

Environment Variables

Available Tools

Troubleshooting

Context & Prompts

About

Setup

Capabilities

​Verification

​Next Steps

Environment Variables

Available Tools

Troubleshooting

Context & Prompts

Verification

Next Steps