The Arbitrage Engine Connecting Ethereum Capital to Bitcoin-Secured Yield.
Apex Yield is a cross-chain structured finance protocol built on Stacks. It automates the arbitrage between saturated Ethereum stablecoin markets (~4% APY) and the emerging high-yield opportunities on Bitcoin L2s (~13.5% APY).
The crypto interest rate market displays a massive inefficiency:
- Ethereum (Oversupply): ~$25B+ of USDC sits on Ethereum earning ~4-5% (Aave/Compound). Capital is abundant and lazy.
- Stacks (Undersupply): The Bitcoin L2 ecosystem is starved for stablecoin liquidity. Traders borrowing against BTC/STX pay premiums of 12-15%+.
Apex Yield acts as an Asset Manager, routing liquidity to where it is treated best.
Apex Yield is not just a bridge; it's a Yield Aggregator. We compose the best DeFi protocols on Stacks into a single, optimized vault.
We utilize Circle's Cross-Chain Transfer Protocol (CCTP) to burn USDC on Ethereum and mint native USDCx on Stacks. This ensures:
- Zero Slippage: 1:1 mint/burn ratio.
- No Liquidity Pools: No bridge hacks or pool imbalances.
- Institutional Trust: Relies on Circle's attestation service.
Once USDCx arrives on Stacks, it is deposited into the Apex Vault. This non-custodial smart contract issues apUSDC (Interest Bearing Receipt) to the user.
The vault deploys capital into two primary strategies:
| Layer | Protocol | Strategy | APY (Est.) |
|---|---|---|---|
| Base Yield | Zest Protocol | Lending Market (Supply Side) | ~8.0% |
| Boost Yield | Bitflow Finance | Real Yield DEX (Swap Fees) | ~5.5% |
| Total | Apex Vault | Aggregate Auto-Compound | ~13.5% |
Note: In the current Testnet Demo, yields are simulated based on mainnet projections.
| Contract | Address |
|---|---|
| USDC (Sepolia) | 0x1c7D4B196Cb0C7B01d743Fbc6116a902379C7238 |
| xReserve (Bridge) | 0x008888878f94C0d87defdf0B07f46B93C1934442 |
| USDCx (Stacks) | ST1PQHQKV0RJXZFY1DGX8MNSNYVE3VGZJSRTPGZGM.usdcx |
| Apex Vault | STZ5Q1C2GVSMCWS9NWVDEKHNW04THC75SEGDHS74.apex-vault-real |
Apex Yield is designed as a sustainable business, operating like a decentralized hedge fund.
- Performance Fee (15%): We take a cut of the profit generated (yield), not the principal. This aligns our incentives with the user.
- Scenario: $10M TVL @ 13.5% APY = $1.35M Profit. Apex Revenue = ~$200k/year.
- Exit Fee (0.1%): A small fee on withdrawal to prevent flash-loan attacks and capture revenue on churn.
- Management Fee (0%): Waived to aggressively acquire TVL.
- Language: Clarity 4
- Standards: SIP-010 (Fungible Token Standard)
- Key Features:
as-contract?flow, explicit asset allowances, block-based yield accrual.
- Framework: React + Vite + TypeScript
- Styling: Tailwind CSS + shadcn/ui (Cyber/Terminal Aesthetic)
- Ethereum: Wagmi + RainbowKit + Viem
- Stacks: Stacks.js + Hiro API
- UX Polish:
framer-motion,react-hot-toast,recharts
- Node.js 18+
- Stacks Leather Wallet (Testnet)
- MetaMask / Rainbow Wallet (Sepolia)
# Clone the repository
git clone https://github.com/man-croft/ApexYield.git
cd ApexYield
# Install frontend dependencies
cd frontend
npm install
# Run development server
npm run dev- Connect Wallets: Connect both Ethereum (Sepolia) and Stacks (Testnet) wallets.
- Zap: Enter an amount of USDC to bridge.
- Track: Watch the bridge progress via our real-time Bridge Tracker.
- Deploy: Once USDCx arrives, sign the transaction to deposit into the Vault.
- Earn: Watch your balance grow in real-time on the Dashboard.
MIT License. Open source software.
Built for the Programming USDCx on Stacks Builder Challenge 2026.