Flow MCP Server

A Model Context Protocol (MCP) server for interacting with the Flow blockchain. This server enables AI assistants to access Flow blockchain data and perform operations through a standardized interface.

Features

Balance checking for Flow and fungible tokens
Domain resolution for .find and .fn domains
Script execution for reading blockchain data
Transaction submission and monitoring
Account information retrieval
Flow configuration based on environment variables

Related MCP server: n8n MCP Server

Installation

Using npx (Recommended)

npx -y @outblock/flow-mcp-server --stdio

Or specify HTTP mode with a port:

npx -y @outblock/flow-mcp-server --port 3000

Local Installation (For Development)

git clone https://github.com/lmcmz/flow-mcp-server.git cd flow-mcp-server npm install npm run build npm start

Usage

Running with npx

# Run in stdio mode (for AI assistant integration) npx -y @outblock/flow-mcp-server --stdio # Run as HTTP server on port 3000 npx -y @outblock/flow-mcp-server --port 3000 # Specify Flow network npx -y @outblock/flow-mcp-server --port 3000 --network testnet

Running Local Development Server

# Run in stdio mode npm run build npm start # Run as HTTP server on port 3000 npm run build PORT=3000 npm start # For development with auto-reload npm run dev

Configuration

The server can be configured using environment variables:

PORT - HTTP port to listen on (if not set, defaults to stdio mode)
FLOW_NETWORK - Flow network to connect to (mainnet, testnet, emulator)
FLOW_ACCESS_NODE - Custom Flow access node URL
LOG_LEVEL - Logging level (debug, info, warn, error)

Using with AI Assistants

When integrating with AI assistants like Claude, you can start the MCP server in stdio mode and connect it to your assistant's tool configuration.

Example Claude tool configuration:

{ "tools": [ { "name": "flow-mcp-server", "command": "npx -y @outblock/flow-mcp-server --stdio" } ] }

HTTP API Endpoints

When running in HTTP mode, the following endpoints are available:

/sse - Server-Sent Events endpoint for real-time updates
/messages - POST endpoint for sending tool requests
/health - Health check endpoint
/ - Server information

Example HTTP API call:

curl -X POST http://localhost:3000/messages \ -H "Content-Type: application/json" \ -d '{ "tool_request": { "name": "get_balance", "parameters": { "address": "0x2d4c3caffbeab845", "network": "mainnet" } } }'