tip.md x402 + CDP MCP Server

🏆 Hackathon Entry: Transform any AI agent into a payment-enabled tipping agent using x402 payment collection with CDP automatic disbursement.

🌟 About tip.md

tip.md is a platform that allows developers to receive cryptocurrency tips directly to their wallets via a simple button embeddable in GitHub READMEs, websites, or any markdown content. It supports:

• Multiple Blockchains: Ethereum, Base,Solana, and Bitcoin Lightning Network
• Direct-to-Wallet Payments: Tips go straight to your wallet, no custody
• Simple Integration: One button, works everywhere markdown is supported
• 4% Platform Fee: Transparent pricing, we only make money if you do
• Client-Side Security: All transactions processed securely in the browser

This MCP server extends tip.md's functionality by enabling any AI agent to facilitate crypto tipping through the innovative x402 + CDP integration.

🚀 Quick Demo (No Setup Required)

For Judges & Evaluators: Experience the x402 + CDP tipping flow instantly:

git clone https://github.com/xR0am/tip-md-x402-mcp-server.git
cd tip-md-x402-mcp-server
npm install
NODE_ENV=demo npm start

⚠️ Important: The server running alone shows logs, but to see the demo payment functionality, you need to connect it to an MCP client (see Testing with MCP Clients below).

🎯 What This Does

Core Innovation: ANY AI agent + this MCP = instant payment-enabled agent

• x402 Payment Collection: Users pay from dedicated wallets using the x402 payment protocol (Money IN)
• CDP Automatic Disbursement: Backend automatically splits payments (96% recipient, 4% platform) via Coinbase Wallet API (Money OUT)
• MCP Tool Integration: Works with Claude, ChatGPT, Cursor, or any MCP-compatible agent
• True Composability: Transform existing AI workflows into payment-enabled experiences

🔄 The Complete Flow

1. User: "Check balance" → Agent: "47.50 USDC available for tipping"
2. User asks AI agent: "Tip @username 5 USDC"
3. x402 Payment Collection: Agent generates payment request, user pays from dedicated wallet
4. CDP Automatic Disbursement: Backend splits payment and sends to recipient + platform
5. AI Confirms: "✅ Sent 5 USDC to @username"

Architecture: True x402 → CDP Flow

User Payment Flow

User → Dedicated Tipping Wallet → x402 Payment Collection → CDP Agent Wallet → CDP Disburses to Recipient (96%) + Platform (4%)

📋 Available MCP Tools

This MCP server exposes 7 tools that any AI agent can use:

💰 x402 + CDP Payment Tools (Hackathon Innovation)

• mcp_tip_md_tip_user_x402: Send USDC tips using x402 payment protocol with CDP automatic disbursement
• mcp_tip_md_check_tipping_balance: Check/create your dedicated x402 tipping wallet balance and info

🔧 Wallet Management Tools

• mcp_tip_md_export_tipping_wallet: Export your tipping wallet private key (security sensitive)
• mcp_tip_md_withdraw_tipping_funds: Withdraw USDC from your tipping wallet to any address

🔍 User & Network Tools

• mcp_tip_md_get_user_wallet_types: Check recipient's supported cryptocurrencies and wallet types
• mcp_tip_md_crypto_tipping: Manual crypto tipping information for agents with wallet to instruct (Ethereum, Base, Solana - no x402/CDP flow)

🏥 System Tools

• mcp_tip_md_ping: Health check endpoint

🧪 Testing with MCP Clients

To see the actual demo payment functionality, you need to connect the MCP server to a compatible client:

Cursor IDE Setup

1. Edit your MCP configuration (~/.cursor/mcp.json):

{
  "mcpServers": {
    "tip-md-demo": {
      "command": "node",
      "args": ["dist/mcp-server/src/index.js"],
      "cwd": "/path/to/tip-md-x402-mcp-server",
      "env": {
        "NODE_ENV": "demo"
      }
    }
  }
}

2. Restart Cursor and look for the 🔨 tools icon

3. Test the demo:

   • Type: "Tip user johndoe 5 USDC using base blockchain"
   • Watch the x402 + CDP simulation in action!

Claude Desktop Setup

1. Install Supergateway (bridges our HTTP transport to stdio):

npm install -g supergateway

2. Configure Claude Desktop (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "tip-md-demo": {
      "command": "npx",
      "args": [
        "-y",
        "supergateway",
        "--httpStream",
        "http://localhost:3000/mcp",
        "--outputTransport",
        "stdio"
      ]
    }
  }
}

3. Start the MCP server in demo mode:

NODE_ENV=demo npm start

4. Restart Claude Desktop and test with: "Show me available tip.md tools"

Other MCP Clients

For clients supporting HTTP-stream transport:

• Endpoint: http://localhost:3000/mcp (when running locally)
• Transport: HTTP-stream
• Environment: Set NODE_ENV=demo for simulation mode

🛠️ Production Integration (Requires Setup)

For full integration with the tip.md platform:

Environment Variables

Create a .env file:

# Database Connection (Required for production)
MONGODB_URI=mongodb+srv://username:[email protected]/database

# Coinbase Developer Platform (Required for CDP disbursement)
CDP_API_KEY_ID=your_cdp_api_key_id
CDP_API_KEY_SECRET=your_cdp_api_key_secret

# x402 Configuration (Required for payment collection)
X402_WALLET_PRIVATE_KEY=your_x402_wallet_private_key

# Optional Configuration
PORT=3000
NODE_ENV=production
LOG_LEVEL=info

Production Deployment

npm install
npm run build
npm start

🏗️ Technical Architecture

x402 Payment Collection

• Dedicated Wallets: Each user gets a unique payment wallet
• Protocol Compliance: Full x402 specification implementation

CDP Automatic Disbursement

• Smart Splitting: 96% to recipient, 4% to platform
• Instant Settlement: Automated via Coinbase Developer Platform

MCP Integration

• Universal Compatibility: Works with any MCP-compatible AI agent
• Structured Responses: Rich JSON responses for seamless integration
• Error Handling: Graceful fallbacks and detailed error messages

🎖️ Hackathon Submission Details

Challenge: Coinbase x402 + CDP Integration Innovation: Universal AI agent payment enablement Demo Mode: NODE_ENV=demo npm start Repository: https://github.com/xR0am/tip-md-x402-mcp-server

Key Differentiators

1. Universal Agent Integration: Any MCP client becomes payment-enabled
2. Complete Payment Flow: x402 collection + CDP disbursement in one solution
3. Zero-Setup Demo: Judges can evaluate immediately
4. Production-Ready: Already integrated with tip.md platform

📚 Learn More

• tip.md Platform: https://tip.md
• MCP Protocol: https://modelcontextprotocol.io
• x402 Specification: https://docs.coinbase.com/x402
• Coinbase CDP: https://docs.cdp.coinbase.com

🤝 Support

For questions about this hackathon entry:

• Issues: Open a GitHub issue
• Email: [email protected]
• Demo Problems: Ensure you're testing through an MCP client, not just the server logs

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Built for the Coinbase x402 + CDP Hackathon 🏆