### Initialize and Run BNB Sniper Bot with Lifecycle Management

Source: https://context7.com/vladmeer/fourmeme-sniper/llms.txt

Complete bot lifecycle example demonstrating initialization of the SniperBot instance, configuration validation, setup of graceful shutdown handlers for SIGINT/SIGTERM signals, and comprehensive error handling for uncaught exceptions and unhandled promise rejections. The bot creates a logs directory, displays a banner, and manages the entire bot lifecycle from startup through graceful termination.

```typescript
import { SniperBot } from './bot/sniperBot';
import { config, validateConfig } from './config';
import { logger } from './utils/logger';
import * as fs from 'fs';
import * as path from 'path';

async function runBot() {
  // Create logs directory
  const logsDir = path.join(process.cwd(), 'logs');
  if (!fs.existsSync(logsDir)) {
    fs.mkdirSync(logsDir, { recursive: true });
  }

  // Display banner
  console.log('╔═══════════════════════════════════════════════════════════╗');
  console.log('║           🎯 BNB SNIPER BOT - FOUR.MEME 🎯              ║');
  console.log('║         High-Speed Token Sniper with MEV Support          ║');
  console.log('╚═══════════════════════════════════════════════════════════╝');

  // Validate configuration
  validateConfig();
  logger.info('✅ Configuration valid');

  // Create bot instance
  const bot = new SniperBot();

  // Setup signal handlers
  const shutdown = async (signal: string) => {
    logger.info(`Received ${signal}, shutting down gracefully...`);
    await bot.stop();
    process.exit(0);
  };

  process.on('SIGINT', () => shutdown('SIGINT'));
  process.on('SIGTERM', () => shutdown('SIGTERM'));

  // Error handlers
  process.on('uncaughtException', (error) => {
    logger.error('Uncaught Exception:', error);
    process.exit(1);
  });

  process.on('unhandledRejection', (reason, promise) => {
    logger.error('Unhandled Rejection:', { promise, reason });
  });

  // Start trading
  await bot.start();
}

runBot().catch((error) => {
  console.error('Fatal error:', error);
  process.exit(1);
});
```

--------------------------------

### Environment Configuration Example (Bash)

Source: https://context7.com/vladmeer/fourmeme-sniper/llms.txt

Lists essential environment variables required for the bot's operation, covering blockchain, wallet, trading, DEX addresses, MEV, and logging configurations.

```bash
# Blockchain Configuration
BSC_RPC_URL=https://bsc-dataseed.binance.org/
BSC_WSS_URL=wss://bsc-dataseed.binance.org/
CHAIN_ID=56

# Wallet Configuration
PRIVATE_KEY=0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef
WALLET_ADDRESS=0x1234567890123456789012345678901234567890

# Trading Configuration
BUY_AMOUNT=0.1
SLIPPAGE_BPS=100
GAS_LIMIT=500000
MAX_GAS_PRICE=10
GAS_PRICE_MULTIPLIER=1.2

# DEX Addresses
FOUR_MEME_FACTORY_ADDRESS=0x...
FOUR_MEME_ROUTER_ADDRESS=0x...
PANCAKE_ROUTER_ADDRESS=0x10ED43C718714eb63d5aA57B78B54704E256024E
PANCAKE_FACTORY_ADDRESS=0xBCfCcbde45cE874adCB698cC183deBcF17952812
WBNB_ADDRESS=0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c

# MEV Configuration
ENABLE_FRONTRUN=true
ENABLE_BACKRUN=true
MEV_SHARE_PERCENTAGE=80

# Logging
LOG_LEVEL=info
```

--------------------------------

### Sniper Bot Main Orchestrator and Lifecycle Management (TypeScript)

Source: https://context7.com/vladmeer/fourmeme-sniper/llms.txt

Initializes and starts the main SniperBot class, handling configuration validation and graceful shutdown. It sets up event listeners for SIGINT and SIGTERM signals to stop the bot and exit cleanly. The script also includes handlers for uncaught exceptions and unhandled rejections to ensure robust error management.

```typescript
import { SniperBot } from './bot/sniperBot';
import { config, validateConfig } from './config';
import { logger } from './utils/logger';

// Initialize and start the bot
async function main() {
  try {
    // Validate configuration
    logger.info('Validating configuration...');
    validateConfig();
    logger.info('✅ Configuration valid');

    // Create bot instance
    const bot = new SniperBot();

    // Handle graceful shutdown
    process.on('SIGINT', async () => {
      logger.info('Received SIGINT signal, shutting down gracefully...');
      await bot.stop();
      process.exit(0);
    });

    process.on('SIGTERM', async () => {
      logger.info('Received SIGTERM signal, shutting down gracefully...');
      await bot.stop();
      process.exit(0);
    });

    // Handle uncaught errors
    process.on('uncaughtException', (error) => {
      logger.error('Uncaught Exception:', error);
      process.exit(1);
    });

    process.on('unhandledRejection', (reason, promise) => {
      logger.error('Unhandled Rejection at:', promise, 'reason:', reason);
    });

    // Start the bot
    await bot.start();

  } catch (error) {
    logger.error('Fatal error:', error);
    process.exit(1);
  }
}

main();

```

--------------------------------

### Monitor New Tokens with TypeScript

Source: https://context7.com/vladmeer/fourmeme-sniper/llms.txt

This snippet demonstrates how to use the TokenMonitor service to detect new tokens in real-time from the four.meme factory and mempool. It defines a callback function to handle detected token information and starts the monitoring process. The service can be stopped, and its active status can be checked.

```typescript
import { TokenMonitor } from './services/tokenMonitor';
import { TokenInfo } from './types';
import { logger } from './utils/logger';

// Initialize token monitor
const tokenMonitor = new TokenMonitor();

// Define callback for new token detection
async function handleNewToken(tokenInfo: TokenInfo): Promise<void> {
  logger.info('════════════════════════════════════════════════════════════');
  logger.info(`🎯 NEW TOKEN DETECTED!`);
  logger.info(`   Name: ${tokenInfo.name}`);
  logger.info(`   Symbol: ${tokenInfo.symbol}`);
  logger.info(`   Address: ${tokenInfo.address}`);
  logger.info(`   Creator: ${tokenInfo.creator}`);
  logger.info(`   Block: ${tokenInfo.blockNumber || 'PENDING'}`);
  logger.info('════════════════════════════════════════════════════════════');

  // Your trading logic here
}

// Start monitoring for new tokens
await tokenMonitor.startMonitoring(handleNewToken);

// Stop monitoring when done
tokenMonitor.stopMonitoring();

// Check monitoring status
const isActive = tokenMonitor.isActive();
console.log(`Token monitoring active: ${isActive}`);
```

--------------------------------

### Execute MEV Transactions with TypeScript and Ethers

Source: https://context7.com/vladmeer/fourmeme-sniper/llms.txt

This snippet demonstrates the MEVExecutor service for advanced transaction strategies like front-running and back-running. It utilizes the ethers.js library for transaction data formatting. The code shows how to prepare target and own transactions, execute front-run and back-run strategies, and calculate optimal gas prices for specific block inclusions.

```typescript
import { MEVExecutor } from './services/mevExecutor';
import { ethers } from 'ethers';
import { PendingTransaction } from './types';
import { logger } from './utils/logger';

// Initialize MEV executor
const mevExecutor = new MEVExecutor();

// Example pending transaction to front-run
const targetTx: PendingTransaction = {
  hash: '0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890',
  from: '0x1234567890123456789012345678901234567890',
  to: '0x0987654321098765432109876543210987654321',
  value: '1000000000000000000',
  gasPrice: '5000000000',
  gasLimit: '300000',
  data: '0x...',
  nonce: 123,
};

// Prepare our transaction data
const ourTxData: ethers.PopulatedTransaction = {
  to: '0x10ED43C718714eb63d5aA57B78B54704E256024E',
  data: '0x7ff36ab5000000000000000000000000000000000000000000000000000000000000000',
  value: ethers.utils.parseEther('0.1'),
};

// Execute front-run (10% higher gas price)
const frontrunTxHash = await mevExecutor.executeFrontrun(targetTx, ourTxData);
logger.info(`✅ Frontrun transaction sent: ${frontrunTxHash}`);

// Execute back-run (5% higher gas price)
const backrunTxHash = await mevExecutor.executeBackrun(targetTx, ourTxData);
logger.info(`✅ Backrun transaction sent: ${backrunTxHash}`);

// Execute with precision timing for optimal block inclusion
const precisionTxHash = await mevExecutor.executeWithPrecisionTiming(ourTxData);
logger.info(`✅ Precision transaction sent: ${precisionTxHash}`);

// Calculate optimal gas for specific block
const currentBlock = await web3Provider.getCurrentBlock();
const targetBlock = currentBlock + 1;
const optimalGas = await mevExecutor.calculateOptimalGas(targetBlock);
logger.info(`Optimal gas price for block ${targetBlock}: ${ethers.utils.formatUnits(optimalGas, 'gwei')} GWEI`);
```

--------------------------------

### Execute Token Trades with TypeScript

Source: https://context7.com/vladmeer/fourmeme-sniper/llms.txt

This code illustrates the TradeExecutor service for buying and selling tokens, featuring automatic retries and slippage protection. It shows how to initialize the executor, buy a token, handle success or failure responses, sell tokens back, and retrieve the current token price in BNB. Dependencies include TokenInfo and TradeResult types.

```typescript
import { TradeExecutor } from './services/tradeExecutor';
import { TokenInfo, TradeResult } from './types';
import { logger } from './utils/logger';

// Initialize trade executor
const tradeExecutor = new TradeExecutor();

// Example token info
const tokenInfo: TokenInfo = {
  address: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb',
  name: 'TestToken',
  symbol: 'TEST',
  decimals: 18,
  creator: '0x1234567890123456789012345678901234567890',
  blockNumber: 12345678,
  timestamp: Math.floor(Date.now() / 1000),
  txHash: '0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890',
};

// Buy token with automatic retry
const buyResult: TradeResult = await tradeExecutor.buyToken(tokenInfo);

if (buyResult.success) {
  logger.info('🎉 TRADE SUCCESSFUL!');
  logger.info(`   Transaction: ${buyResult.txHash}`);
  logger.info(`   Tokens Bought: ${buyResult.tokensBought} ${tokenInfo.symbol}`);
  logger.info(`   Gas Used: ${buyResult.gasUsed}`);
} else {
  logger.error('❌ TRADE FAILED!');
  logger.error(`   Reason: ${buyResult.error}`);
}

// Sell tokens back to BNB
const sellResult: TradeResult = await tradeExecutor.sellToken(
  tokenInfo.address,
  '1000.0',  // Amount to sell
  18         // Token decimals
);

if (sellResult.success) {
  logger.info(`✅ Sell successful: ${sellResult.txHash}`);
  logger.info(`   Gas Used: ${sellResult.gasUsed}`);
}

// Get current token price
const priceInBNB = await tradeExecutor.getTokenPrice(tokenInfo.address);
console.log(`Current price: ${priceInBNB} BNB per token`);
```

--------------------------------

### Environment Configuration and Validation (TypeScript)

Source: https://context7.com/vladmeer/fourmeme-sniper/llms.txt

Loads environment variables for bot configuration using dotenv and provides validation for essential parameters. It defines the BotConfig interface and exports a configuration object populated from process.env, with default values. The validateConfig function ensures that critical settings like privateKey and walletAddress are present and correctly formatted.

```typescript
import dotenv from 'dotenv';
import { BotConfig } from '../types';

dotenv.config();

// Complete configuration object
export const config: BotConfig = {
  bscRpcUrl: process.env.BSC_RPC_URL || 'https://bsc-dataseed.binance.org/',
  bscWssUrl: process.env.BSC_WSS_URL || 'wss://bsc-dataseed.binance.org/',
  chainId: parseInt(process.env.CHAIN_ID || '56'),
  privateKey: process.env.PRIVATE_KEY || '',
  walletAddress: process.env.WALLET_ADDRESS || '',
  buyAmount: process.env.BUY_AMOUNT || '0.1',
  gasLimit: parseInt(process.env.GAS_LIMIT || '500000'),
  gasPriceMultiplier: parseFloat(process.env.GAS_PRICE_MULTIPLIER || '1.2'),
  maxGasPrice: process.env.MAX_GAS_PRICE || '10',
  slippageBps: parseInt(process.env.SLIPPAGE_BPS || '100'),
  fourMemeFactoryAddress: process.env.FOUR_MEME_FACTORY_ADDRESS || '',
  fourMemeRouterAddress: process.env.FOUR_MEME_ROUTER_ADDRESS || '',
  pancakeRouterAddress: process.env.PANCAKE_ROUTER_ADDRESS || '0x10ED43C718714eb63d5aA57B78B54704E256024E',
  pancakeFactoryAddress: process.env.PANCAKE_FACTORY_ADDRESS || '0xBCfCcbde45cE874adCB698cC183deBcF17952812',
  wbnbAddress: process.env.WBNB_ADDRESS || '0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c',
  enableFrontrun: process.env.ENABLE_FRONTRUN === 'true',
  enableBackrun: process.env.ENABLE_BACKRUN === 'true',
  mevSharePercentage: parseInt(process.env.MEV_SHARE_PERCENTAGE || '80'),
  logLevel: process.env.LOG_LEVEL || 'info',
};

// Validate required configuration
export function validateConfig(): void {
  const required = ['privateKey', 'walletAddress', 'bscRpcUrl'];

  for (const key of required) {
    if (!config[key as keyof BotConfig]) {
      throw new Error(`Missing required configuration: ${key}`);
    }
  }

  if (!config.privateKey.startsWith('0x')) {
    throw new Error('Private key must start with 0x');
  }

  if (config.privateKey.length !== 66) {
    throw new Error('Invalid private key length');
  }
}

```

--------------------------------

### Balance Checking Utility (TypeScript)

Source: https://context7.com/vladmeer/fourmeme-sniper/llms.txt

Checks the wallet balance in BNB and Wei, and calculates the maximum number of trades possible based on a configured buy amount. Logs warnings if the balance is insufficient for even one trade. Dependencies: './utils/web3Provider', './config', 'ethers'.

```typescript
import { web3Provider } from './utils/web3Provider';
import { config } from './config';
import { ethers } from 'ethers';

async function checkBalance() {
  console.log('\ud83d\udcb0 Checking Wallet Balance...\n');

  try {
    // Get wallet balance
    const balance = await web3Provider.wallet.getBalance();
    const balanceBNB = ethers.utils.formatEther(balance);

    console.log(`Wallet Address: ${config.walletAddress}`);
    console.log(`Balance: ${balanceBNB} BNB`);
    console.log(`Balance (Wei): ${balance.toString()}`);

    // Calculate how many trades possible
    const buyAmount = parseFloat(config.buyAmount);
    const maxTrades = Math.floor(parseFloat(balanceBNB) / buyAmount);

    console.log(`\nWith buy amount of ${config.buyAmount} BNB:`);
    console.log(`Maximum possible trades: ${maxTrades}`);

    if (parseFloat(balanceBNB) < buyAmount) {
      console.log('\n\u26a0\ufe0f  WARNING: Insufficient balance for even one trade!');
    }

  } catch (error) {
    console.error('Error:', error);
  }
}

checkBalance();
```

--------------------------------

### Honeypot Detection Service (TypeScript)

Source: https://context7.com/vladmeer/fourmeme-sniper/llms.txt

Checks if a given token address is a honeypot. It utilizes a HoneypotDetector utility and logs warnings if a potential honeypot is found. Includes a simulation of a buy transaction to check tradeability. Dependencies: './utils/honeypotDetector', './utils/logger', 'ethers'.

```typescript
import { HoneypotDetector } from './utils/honeypotDetector';
import { logger } from './utils/logger';
import { ethers } from 'ethers';

// Initialize honeypot detector
const honeypotDetector = new HoneypotDetector();

// Check if token is a honeypot
const tokenAddress = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb';
const result = await honeypotDetector.checkToken(tokenAddress);

if (result.isHoneypot) {
  logger.warn(`\u26a0\ufe0f  Potential honeypot detected: ${tokenAddress}`);
  result.reasons.forEach(reason => {
    logger.warn(`   - ${reason}`);
  });
  // Do not trade this token
} else {
  logger.info(`\u2705 Token appears safe: ${tokenAddress}`);
  // Proceed with trading
}

// Simulate a buy transaction before executing
const amountIn = ethers.utils.parseEther('0.1');
const canBuy = await honeypotDetector.simulateBuy(tokenAddress, amountIn);

if (canBuy) {
  logger.info('\u2705 Buy simulation successful');
} else {
  logger.error('❌ Buy simulation failed - token may not be tradeable');
}
```

--------------------------------

### Core Type Definitions (TypeScript)

Source: https://context7.com/vladmeer/fourmeme-sniper/llms.txt

Defines essential TypeScript interfaces used throughout the bot for configuration, token information, trade results, pending transactions, and MEV bundles.

```typescript
export interface BotConfig {
  bscRpcUrl: string;
  bscWssUrl: string;
  chainId: number;
  privateKey: string;
  walletAddress: string;
  buyAmount: string;
  gasLimit: number;
  gasPriceMultiplier: number;
  maxGasPrice: string;
  slippageBps: number;
  fourMemeFactoryAddress: string;
  fourMemeRouterAddress: string;
  pancakeRouterAddress: string;
  pancakeFactoryAddress: string;
  wbnbAddress: string;
  enableFrontrun: boolean;
  enableBackrun: boolean;
  mevSharePercentage: number;
  logLevel: string;
}

export interface TokenInfo {
  address: string;
  name: string;
  symbol: string;
  decimals: number;
  creator: string;
  blockNumber: number;
  timestamp: number;
  txHash: string;
}

export interface TradeResult {
  success: boolean;
  txHash?: string;
  error?: string;
  gasUsed?: string;
  tokensBought?: string;
  price?: string;
}

export interface PendingTransaction {
  hash: string;
  from: string;
  to: string;
  value: string;
  gasPrice: string;
  gasLimit: string;
  data: string;
  nonce: number;
}

export interface MEVBundle {
  transactions: string[];
  blockNumber: number;
  minTimestamp?: number;
  maxTimestamp?: number;
}
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.