Solana Prediction Market Smart Contract

A decentralized prediction market smart contract on Solana, inspired by Polymarket. Create markets, trade Yes/No positions, and resolve outcomes—all on-chain.

Overview

This project provides a full-featured prediction market built with the Anchor framework. Users can create binary outcome markets for any event, add liquidity, trade positions using Yes/No SPL tokens, and resolve markets based on real-world outcomes. The architecture is modular and the patterns can be adapted for EVM chains.

Features

• Market Creation — Create binary outcome markets for any event
• Liquidity Provision — Add and withdraw liquidity to support trading
• Trading — Trade positions using Yes/No tokens
• Market Resolution — Resolve markets based on final outcomes with automatic payouts
• Fee Structure — Configurable platform and LP fees
• Extensible — Clear patterns for adapting to other chains

Tech Stack

• Anchor — Solana smart contract framework
• Solana Web3.js — JavaScript SDK
• SPL Token Program
• Associated Token Program

Prerequisites

• Node.js
• Yarn
• Solana CLI
• Anchor Framework

Installation

1. Clone the repository:

git clone https://github.com/rustjesty/solana-prediction-market-smart-contract
cd solana-prediction-market-smart-contract

2. Install dependencies:

yarn install

3. Build and deploy the program:

anchor build
anchor deploy

Configuration

Configure environment, keypair, and RPC URL:

yarn script config -e devnet -k <your-keypair-path> -r <your-rpc-url>

Usage

Workflow order: config → market → addlp → swap (optional) → withdraw → resolution

Create a Market

yarn script market -e devnet -k <your-keypair-path> -r <your-rpc-url>

Add Liquidity

You must add liquidity before you can withdraw it.

yarn script addlp -y <yes-token-address> -n <no-token-address> -a <amount> -e devnet -k <your-keypair-path> -r <your-rpc-url>

Trade Positions

• -s (style): 0 = buy, 1 = sell
• -t (token-type): 0 = NO token, 1 = YES token

yarn script swap -y <yes-token-address> -n <no-token-address> -a <amount> -s <style> -t <token-type> -e devnet -k <your-keypair-path> -r <your-rpc-url>

Withdraw Liquidity

Requires that you have added liquidity first via addlp.

yarn script withdraw -y <yes-token-address> -n <no-token-address> -a <amount> -e devnet -k <your-keypair-path> -r <your-rpc-url>

Resolve Market

yarn script resolution -y <yes-token-address> -n <no-token-address> -e devnet -k <your-keypair-path> -r <your-rpc-url>

Example Transaction

Config transaction on Solscan (Devnet)

Create market transaction on Solscan (Devnet)

Yes Token (Devnet)

No Token (Devnet)

Add Liquidity(Devnet)

Resolution (Devnet)

Contact

For questions or custom implementations:

• Telegram

Contributing

Contributions are welcome. Please open an issue or submit a pull request.

License

MIT — see LICENSE for details.