Solana PumpFun Trading Bot

A practical Solana trading bot for PumpFun-style markets. It uses multiple wallets, watches for external buyers, and applies a Kelly-based stake sizing approach to keep buy sizes more disciplined.

What it does

• Creates or loads multiple wallets
• Funds wallets with SOL
• Watches the token market for incoming buyers and sellers
• Buys in a controlled sequence
• Pauses when another buyer enters the market
• Sells from the most recently purchased wallet when the market turns
• Uses Kelly-criterion sizing with configurable max/min bounds

Main features

• Multi-wallet trading flow
• PumpFun SDK integration
• Slippage protection
• Wait-and-sell reaction logic
• Kelly-based buy sizing
• Simple logging for each trading step

Requirements

• Node.js 18+
• npm
• A funded Solana wallet
• A working RPC endpoint
• Enough SOL for funding test wallets

Installation

npm install

Configuration

Create a .env file and configure values such as:

RPC_URL=https://api.mainnet-beta.solana.com
FUNDINGWALLETPRIVATEKEY=yourbase58privatekey
TOKENMINTADDRESS=yourtokenmint_address
SLIPPAGE_BPS=50
BUYAMOUNTSOL=0.01
WAITTIMEOUTMS=20000
NUM_WALLETS=10
KELLYBANKROLLSOL=500 KELLY_PROBABILITY=0.58 KELLYALLIN_PRICE=0.52 KELLYMAXSTAKE_SOL=25 KELLYMINSTAKE_SOL=5 KELLY_FRACTION=0.5

Running the bot

Development

npm run dev

Production build

npm run build
npm start

Trading flow

• The bot loads or creates wallets.
• It funds the wallets with SOL.
• It checks for external market activity.
• If no one else has bought, it places a buy.
• If another buyer appears, it pauses and waits.
• If the buyer holds the market for too long, it starts selling from the most recently bought wallet.
• If the buyer exits quickly, it resumes buying.

Kelly sizing

The bot now uses a Kelly-based stake calculation through the stake-math package. The buy amount is capped between a minimum and maximum stake and logged for transparency.

Project structure

src/
├── config/          # Configuration values and env parsing
├── engine/          # Buy/sell trading loop
├── monitor/         # Market monitoring
├── pumpfun/         # PumpFun SDK integration
├── token/           # Token deployment helpers
├── utils/           # Shared helpers such as Kelly sizing
├── wallet/          # Wallet creation and funding
└── types/           # TypeScript types

Documentation

Useful guides are included in the repository:

• ARCHITECTURE.md
• PUMPFUN_SETUP.md
• TEST_CASES.md
• TESTING_GUIDE.md

Safety notes

• Use small amounts when testing.
• Keep your private keys secure and never commit them.
• Review slippage and Kelly settings before trading live.
• This bot is a trading tool, not a guarantee of profit.

License

MIT