BitYield Protocol

Inspiration

Bitcoin holders control $2 trillion in assets, yet 95% of BTC remains idle. While Ethereum DeFi exploded with TVL exceeding $50B, Bitcoin users face a painful reality: accessing yield requires navigating complex bridges, multiple wrapped tokens, and fragmented protocols across chains.

We envisioned a future where a grandmother in El Salvador could earn yield on her Bitcoin savings as easily as she checks her balance. BitYield Protocol makes this vision real on Starknet - combining Cairo's provable computation with Bitcoin's security and AI Agents (for simplier UI/UX) to create the first truly native Bitcoin yield aggregator.

What it does

BitYield Protocol is the first AI-powered Bitcoin yield aggregator on Starknet

Seamless Bridge Integration: Users deposit BTC through Atomiq Protocol's Bitcoin bridge, receiving WBTC on Starknet through AI Agent

Intelligent Yield Optimization: Our StrategyManager automatically allocates funds across Vesu lending markets (currently 70/30 split) using Cairo-verified rebalancing algorithms

ERC4626-Compliant Vault: Users receive byWBTC share tokens representing their yield-bearing position with real-time price appreciation:

Automated Rebalancing: Our Contracts auto triggers rebalancing when yield differentials exceed 5% threshold

Fee Optimization: Performance fees (1%) + management fees (0.5% annually) auto-compound into user positions

How we built it

Architecture Stack

Smart Contracts: Cairo, Starknet Scaffold 2
Frontend: Next.js, React, TypeScript, Tailwind CSS
Agents: LangGraph, Node.js

Challenges we ran into

1. Atomiq contracts not yet on Starknet testnet

Solution: Created comprehensive MockAtomiqGateway simulating full bridge flow including relayer authorization, Bitcoin transaction verification, and WBTC minting/burning.

2. Creating flexible adapters that work with different yield sources

Vesu's ERC4626 vs Troves' custom interface presented integration challenges.

Solution: Built trait-based adapter system with standardized deposit(), withdraw(), get_total_assets() interface, allowing hot-swappable protocol integrations.

Accomplishments that we're proud of

First Bitcoin-native yield aggregator on Starknet
Seamless UX - No manual bridging/wrapping for users
Automated optimization via Cairo smart contracts
Multi-protocol integration (Vesu, Troves, Atomiq)
ERC4626 compliance for composability

What we learned

DeFi Yield Mechanics

Studied Vesu's lending model and realized optimal rebalancing isn't just APY comparison—must factor in:

Utilization curves:

$$r(u) = r_0 + \frac{u}{1-u} \times r_{slope}$$

Gas costs vs yield delta
Slippage on large rebalances

Bridge Architecture

Learned Bitcoin SPV proofs, relayer economics, and the importance of separation between bridge state (off-chain verification) and application logic (on-chain distribution).