Relay Protocol MCP Server

- Cross-Chain Bridging- Bridge tokens between 50+ blockchain networks
- Multi-Chain Swaps- Aggregate tokens from multiple chains into single destination
- Real-Time Pricing- Get current token prices across all supported chains
- Request Monitoring- Track execution status and transaction details
- Currency Discovery- Browse 1000+ supported tokens with filtering
- Zero Configuration- No API keys required (free public API)
- Type Safety- Full TypeScript support with comprehensive validation

# Install and build pnpm install && pnpm build # Run development server pnpm dev # Run production server pnpm start

Deploy to Railway, Heroku, Render, or any cloud platform:

# Build the server pnpm build # Start SSE server (uses PORT from environment or 3000) pnpm start:sse # Or for development pnpm dev:sse

Stdio Transport (Local - Claude Desktop)

Add to your Claude Desktop configuration file:

- macOS:~/Library/Application Support/Claude/claude_desktop_config.json
- Windows:%APPDATA%\Claude\claude_desktop_config.json
- Linux:~/.config/Claude/claude_desktop_config.json

{ "mcpServers": { "Relay Protocol": { "transport": "sse", "url": "https://your-app.railway.app/sse" } } }

curl https://your-app.railway.app/health # Response: {"status":"healthy","server":"Relay Protocol","version":"0.1.0","transport":"sse"}

- Free tier: $5/month credits (plenty for personal use)
- Memory usage: ~50-100MB RAM
- Auto-sleeps after 30 minutes of inactivity
- Railway CLI:npm i -g @railway/cli(optional)

# Bridge tokens "Bridge 100 USDC from Ethereum to Polygon" "What chains can I bridge USDC between?" # Multi-chain swaps "Swap all my USDC from Ethereum and Polygon to ETH on Arbitrum" "Consolidate my tokens from multiple chains into USDC on Base" # Price discovery "Show current ETH prices across all chains" "What's the cheapest way to get USDC on Optimism?" # Currency discovery "Find all stablecoins available on Polygon" "Show me verified tokens with bridging support"

pnpm typecheck # Type checking pnpm dev # Development with auto-reload pnpm build # Production build pnpm start # Start production server

src/ ├── client/ # HTTP client and error handling ├── tools/ # 9 MCP tool implementations ├── types/relay.ts # Complete TypeScript definitions ├── config.ts # API configuration ├── index.ts # Stdio transport (local) └── server.ts # SSE transport (cloud)

"No available tools" in Claude:
- Verify absolute path in config is correct
- Test server:echo '{"jsonrpc": "2.0", "id": 1, "method": "tools/list"}' | node dist/index.js
- Restart Claude Desktop after config changes
- Ensure Node.js >= 20.0.0 andpnpm buildcompleted

- Runpnpm buildbefore starting
- Check server starts without errors:pnpm dev
- Verify JSON syntax in Claude config file

- Node.js >= 20.0.0
- pnpm package manager

- 50+ Blockchain Networksincluding Ethereum, Polygon, Arbitrum, Optimism, Base, etc.
- 1000+ Tokenswith real-time pricing and bridging support
- Free Public APIwith no rate limits or authentication required
- Production-Readyinfrastructure handling millions in daily volume

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