Creating a Solana Copy Trading Bot Using Pump.fun

This guide explains how to build a Solana trading bot that replicates transactions from a specified wallet using Pump.fun API and Yellowstone gRPC.

Educational Purpose Only

This guide is for educational purposes only and should not be considered financial advice. Trading bots carry risks and may result in financial losses. Always conduct your own research and consult a financial advisor before using trading bots or engaging in trading activities.

Overview

We'll create a Solana trading bot that:

1. Monitors specified wallets on Pump.fun DEX
2. Replicates their buy transactions using predefined strategies
3. Tests bot functionality through simulated transactions

Prerequisites

• Intermediate knowledge of Solana development and DeFi concepts
• JavaScript and Node.js experience
• Solana wallet with SOL balance
• QuickNode account with Yellowstone gRPC plugin enabled

Key Components

Pump.fun API

We'll use the /pump-fun/swap endpoint to:

• Get serialized transactions for swaps
• Requires wallet public key, transaction type, token mint address, and amount

Yellowstone gRPC

Yellowstone provides:

• Real-time event updates via gRPC API
• Custom subscriptions for blockchain monitoring
• Ideal for building trading bots and dApps

Project Setup

1. Initialize Node.js project:

   npm init -y
   npm install @solana/web3.js@1 bs58 dotenv @triton-one/yellowstone-grpc

2. Configure .env file:

   SOLANA_RPC=<your_rpc_endpoint>
   SECRET_KEY=<your_wallet_secret_key>
   METIS_ENDPOINT=<your_metis_endpoint>
   YELLOWSTONE_ENDPOINT=<your_yellowstone_endpoint>
   YELLOWSTONE_TOKEN=<your_yellowstone_token>

Building the Trading Bot

Core Functions

1. fetchSwapTransaction() - Gets swap transaction from Pump.fun API
2. signTransaction() - Signs transaction with wallet keypair
3. sendAndConfirmTransaction() - Broadcasts signed transaction
4. handleWhaleBuy() - Processes copied transactions

Yellowstone Subscription

Configure subscription to:

• Monitor specified wallet addresses
• Filter Pump.fun program transactions
• Process buy/sell events

Transaction Processing

handleData = (data) => {
  // Process transaction data
  // Identify buy/sell transactions
  // Extract token mint and amounts
  // Trigger copy trades
};

Testing the Bot

1. Fund your bot wallet

2. Run the bot:

   node bot.js

3. Execute test transactions from monitored wallet
4. Verify bot responses and logs

Enhancements

Consider adding:

• Variable buy amounts based on transaction size
• Stop-loss/sell signals
• Multi-protocol monitoring

👉 Explore advanced bot configurations

FAQ

What's the minimum SOL needed per transaction?

The default minimum is 0.001 SOL, configurable in MIN_TX_AMOUNT.

Can I use TypeScript instead?

Yes! Check our TypeScript and Web3.js 2.0 guides for adaptation.

Is there rate limiting?

Public endpoints may have rate limits. For production use, consider dedicated endpoints.

How do I handle failed transactions?

The bot logs all transaction attempts with status information for debugging.

👉 Learn more about transaction handling

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