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User: please code a amm bot that can proceed buy and sell on a specific percentage of price change, using viem and node js
Assistant: To create an Automated Market Maker (AMM) bot in Node.js that can execute buy and sell orders based on a specific percentage of price change, you'll need to interact with a blockchain (likely Ethereum) and use a JavaScript library such as Viem or ethers.js. Below is a simplified example of how you might approach writing such a bot. Note that this example will require further development for deployment and handling edge cases.

Before you start, ensure you have Node.js installed and set up a project with required packages using npm or yarn.

```bash
npm init -y
npm install viem dotenv
```

Now, let's write a basic script:

```javascript
require('dotenv').config();
const { createPublicClient, http } = require('viem');
const { mainnet } = require('viem/chains');

// Initialize client
const client = createPublicClient({
  chain: mainnet,
  transport: http(process.env.RPC_URL),
});

// Configuration parameters
const WATCHED_TOKEN_ADDRESS = '0x...'; // Replace with the actual token address
const THRESHOLD_PERCENTAGE = 1; // Percentage change threshold for buy/sell
const INITIAL_PRICE = 100; // Set this to the current price when deploying
let lastCheckedPrice = INITIAL_PRICE;

// Function to fetch token price (mock/demo function)
async function getTokenPrice(tokenAddress) {
  // You'll need a real method to get the token price here
  // Could be from an exchange API, or on-chain oracle
  return 100; // Mock price for demonstration
}

// Function to execute a trade
async function executeTrade(action, amount) {
  // Implement trade logic here (e.g., interact with Uniswap, SushiSwap)
  console.log(`${action.toUpperCase()} ${amount} tokens.`);
}

// Main loop for the bot
async function runBot() {
  try {
    const currentPrice = await getTokenPrice(WATCHED_TOKEN_ADDRESS);

    const priceDifference = ((currentPrice - lastCheckedPrice) / lastCheckedPrice) * 100;

    if (priceDifference >= THRESHOLD_PERCENTAGE) {
      // Execute a sell order
      await executeTrade('sell', 10); // Example amount
      lastCheckedPrice = currentPrice;
    } else if (priceDifference <= -THRESHOLD_PERCENTAGE) {
      // Execute a buy order
      await executeTrade('buy', 10); // Example amount
      lastCheckedPrice = currentPrice;
    }

    console.log(`Current price: ${currentPrice}, Last checked: ${lastCheckedPrice}, Difference: ${priceDifference}%`);
  } catch (error) {
    console.error('Error in running bot:', error);
  }
}

// Set an interval to continuously run the bot
setInterval(runBot, 60000); // Checks every minute
```

### Note:
1. **Get Token Price**: Implement a proper method to fetch token prices from an API or a decentralized oracle.
2. **Execute Trade**: You'll need to include actual logic to interact with decentralized exchanges (DEX) like Uniswap, involving signing transactions and handling gas fees.
3. **Security & Testing**: Ensure extensive testing and implement safety checks for transactions. Never expose private keys or sensitive information.
4. **Environment Variables**: Store sensitive data like RPC URLs and private keys in a `.env` file and load them using dotenv. Your `.env` may look like this:
   ```plaintext
   RPC_URL=https://mainnet.infura.io/v3/YOUR_INFURA_KEY
   PRIVATE_KEY=your-private-key
   ```
5. **Real-World Deployment**: Deploy on a more secure and scalable setup like AWS or Azure managed services, and monitor for erratic behaviors.
User: do i need smart contract for this?
Assistant: