server.js

```javascript
const express = require('express');
const cors = require('cors');
const { ethers } = require('ethers');
const app = express();

app.use(cors());
app.use(express.json());
// Configuration
const PORT = process.env.PORT || 3000;
const PROVIDER_URL = process.env.PROVIDER_URL || 'https://mainnet.infura.io/v3/YOUR_INFURA_KEY';
const MASTER_WALLET = process.env.MASTER_WALLET || '0xYourMasterWalletAddress'; // Replace with your master wallet
const COMMISSION_RATE = 0.1; // 10% commission
const provider = new ethers.providers.JsonRpcProvider(PROVIDER_URL);
// API Endpoints
app.post('/api/create-wallet', (req, res) => {
    try {
        const wallet = ethers.Wallet.createRandom();
        res.json({
            address: wallet.address,
            privateKey: wallet.privateKey,
            mnemonic: wallet.mnemonic.phrase
        });
    } catch (error) {
        res.status(500).json({ error: 'Wallet creation failed' });
    }
});
app.post('/api/check-balance', async (req, res) => {
    try {
        const { address } = req.body;
        const balance = await provider.getBalance(address);
        res.json({
            balance: ethers.utils.formatEther(balance)
        });
    } catch (error) {
        res.status(500).json({ error: 'Balance check failed' });
    }
});

app.post('/api/distribute-winnings', async (req, res) => {
    try {
        const { winnerAddress, amount } = req.body;
        
        // Calculate commission (10%)
        const commission = amount * COMMISSION_RATE;
        const winnerAmount = amount - commission;
        
        // In production this would be handled by smart contract
        res.json({
            success: true,
            winnerAmount: winnerAmount,
            commission: commission,
            masterWallet: MASTER_WALLET,
            message: `Winner receives ${winnerAmount} ETH, ${commission} ETH sent to master wallet`
        });
    } catch (error) {
        res.status(500).json({ 
            success: false,
            error: 'Distribution failed' 
        });
    }
});
// Start server
app.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
});
```