DeFi Composer

DeFi Composer enables Yearn-style multi-protocol vaults written in Solidity that compose across multiple Solana DeFi protocols atomically via CPI.

Overview

A single Solidity function can orchestrate operations across Jupiter, Kamino, Drift, Meteora, and other Solana protocols — all atomically. If any step fails, the entire transaction reverts.

function executeStrategy(uint256 amount) external {
    // 1. Swap 50% USDC to SOL via Jupiter
    IJupiter(JUPITER).swap(USDC, SOL, amount / 2, minSolOut);

    // 2. Deposit SOL as collateral on Kamino
    IKamino(KAMINO).deposit(SOL, solAmount);

    // 3. Borrow USDC against SOL collateral
    IKamino(KAMINO).borrow(USDC, borrowAmount);

    // 4. Open SOL-PERP short on Drift (delta hedge)
    IDrift(DRIFT).placeOrder(SOL_PERP, SHORT, size, leverage);

    // All atomic. One Solidity function. Four CPI hops.
}

Why Solidity for DeFi Composition?

• Familiar tooling — Solidity devs don't need to learn Rust/Anchor

• Mature ecosystem — leverage OpenZeppelin, existing audit tooling, Hardhat/Foundry workflows

• Composability — Solidity's try/catch, modifiers, and inheritance work naturally

• Atomic execution — Solana's transaction model guarantees all-or-nothing

Reference Strategies (Planned)

Strategy	Protocols	Description
SOL Yield Optimizer	Kamino, Drift	Supply SOL, borrow stables, delta-hedge on perps
Stablecoin Yield	Kamino, Orca	LP stablecoins across pools, auto-rebalance
Delta-Neutral	Jupiter, Kamino, Drift	Swap + supply + hedge for yield without exposure
LST Arbitrage	Jupiter, Marinade	Exploit LST price differentials

Status

Designed — depends on Rome SDK Phase 2 (IJupiter, IDrift, IKamino interfaces). Core CPI infrastructure is live; protocol-specific typed interfaces are in progress.

What's Next

• Rome SDK — typed Solidity interfaces for Solana programs

• Call Solana from EVM — CPI guide

• Constraints — CPI depth limits and compute budget