No-lose prediction markets on Solana

Predict the future, risk nothing. Winners earn yield, losers get their deposit back.

PolyYield lets you bet on real-world events (politics, crypto, sports, etc.) without risking your principal. Your USDC is deposited into a Solana vault; if you win, you earn yield from the losing pool. If you lose, you get your full deposit back.

• Frontend: Next.js 16, React 19, TypeScript, Tailwind CSS, Three.js
• Blockchain: Solana, Anchor 0.30.1 (Rust)
• Database: Supabase // PostgreSQL
• Markets: Polymarket API
• Deployment: Vercel

# Install dependencies
pnpm install

# Start dev server
pnpm dev

Open http://localhost:3000

1. Install Solana CLI and configure for devnet:

   solana config set --url devnet
   solana-keygen new
   solana airdrop 2

2. Get devnet USDC from https://faucet.circle.com/ (select Solana Devnet)

3. Deploy the program:

   anchor build
   anchor deploy
   npx ts-node scripts/initialize-vault.ts

4. Connect Phantom (set to Devnet mode) and start trading!

Create .env.local:

NEXT_PUBLIC_SUPABASE_URL=your_supabase_url
NEXT_PUBLIC_SUPABASE_ANON_KEY=your_anon_key    

Devnet: FWGiD7WhXu8k7eDtEwr3ZbXbvqwL7kdJgNfugrSVJ7F3

polyield/
├── app/                 # Next.js pages
├── components/          # React components
├── hooks/               # Custom hooks (deposit, markets, positions)
├── lib/
│   ├── solana/          # Blockchain integration
│   ├── database/        # Supabase service
│   └── api/             # Polymarket API
├── programs/            # Anchor smart contract
│   └── polyield_vault/
└── scripts/             # Deployment scripts

Three instructions:

• initialize — Create the vault
• deposit — Deposit USDC to YES or NO position
• withdraw — Withdraw USDC after market resolution

• QUICKSTART.md — Step-by-step testing guide
• DEVNET_SETUP.md — Detailed Solana setup
• SUPABASE_SETUP.md — Database configuration

• Solscan Devnet
• Circle USDC Faucet
• SOL Faucet
• Phantom Wallet

Built on Solana 🟣