DeFi Yield Aggregator

A decentralized finance platform that automatically optimizes yield farming strategies across multiple protocols to maximize returns.

📋 Table of Contents

Overview
Features
Technology Stack
Project Structure
Smart Contracts
Getting Started
Development Roadmap
Known Issues
Contributing
License

🎯 Overview

The DeFi Yield Aggregator is an automated cross-protocol yield optimization platform built on Ethereum. It intelligently distributes user funds across multiple DeFi protocols (Aave, Compound, Curve) to maximize yield while minimizing risk and gas costs.

Key Objectives

30%+ APY Improvement: Achieve higher yields compared to single-protocol staking
$5M+ TVL Target: Scale to significant total value locked within first month
Multi-Protocol Integration: Seamlessly aggregate yields from top DeFi protocols
Gas Optimization: Minimize transaction costs through efficient smart contract design

✨ Features

Implemented (Phase 1) ✅

ERC-4626 Compliant Vault: Standard tokenized vault implementation
Multi-Strategy Management: Orchestrate multiple yield strategies with custom allocations
Aave V3 Integration: Automated deposits and interest harvesting
Compound V3 Integration: Supply assets and claim COMP rewards
Security Controls: Role-based access control, pausability, reentrancy protection
Gas Optimization: Efficient storage packing and viaIR compilation

Planned Features

Curve Finance Integration: LP provision and gauge staking
Automated Rebalancing: Dynamic allocation based on real-time APY
Frontend Dashboard: React-based UI for vault management
Performance Analytics: Historical yield tracking and reporting
Multi-Network Support: Deploy to L2s (Arbitrum, Optimism, Polygon)

🛠 Technology Stack

Layer	Technology	Purpose
Smart Contracts	Solidity ^0.8.24	Core protocol logic
Development	Hardhat 2.22.17	Testing & deployment
Blockchain	Ethereum	Mainnet & testnets
Standards	ERC-4626, ERC-20	Tokenized vault
Security	OpenZeppelin	Secure contract libraries
Testing	Hardhat Toolbox	Chai, Ethers, Coverage

📁 Project Structure

defi-yield-aggregator/
├── contracts/
│   ├── core/
│   │   ├── Vault.sol                    # ERC-4626 main vault
│   │   └── StrategyManager.sol          # Multi-strategy orchestration
│   ├── strategies/
│   │   ├── BaseStrategy.sol             # Abstract strategy base
│   │   ├── AaveStrategy.sol             # Aave V3 integration
│   │   └── CompoundStrategy.sol         # Compound V3 integration
│   ├── interfaces/
│   │   ├── IVault.sol                   # Vault interface
│   │   ├── IStrategy.sol                # Strategy interface
│   │   ├── IStrategyManager.sol         # Manager interface
│   │   └── external/
│   │       ├── IAave.sol                # Aave V3 interfaces
│   │       └── ICompound.sol            # Compound V3 interfaces
│   └── libraries/
│       └── MathUtils.sol                # Math utilities
├── scripts/
│   └── deploy.ts                        # Deployment script
├── docs/
│   ├── CODE_REVIEW_PHASES_INDEX.md      # Master phase index
│   ├── CODE_REVIEW_PHASE1_SMART_CONTRACT_DEVELOPMENT.md
│   ├── CODE_REVIEW_PHASE2_FRONTEND_DEVELOPMENT.md
│   ├── CODE_REVIEW_PHASE3_INTEGRATION_TESTING.md
│   └── CODE_REVIEW_PHASE4_DEPLOYMENT_LAUNCH.md
├── hardhat.config.js                    # Hardhat configuration
├── .env.example                         # Environment template
└── package.json                         # Dependencies

📜 Smart Contracts

Core Contracts

Vault.sol

The main entry point for user interactions. An ERC-4626 compliant tokenized vault that:

Accepts deposits and mints shares
Handles withdrawals and burns shares
Integrates with StrategyManager for yield optimization
Implements role-based access control (Admin, Strategist, Guardian)
Includes pausability and emergency withdrawal mechanisms

Key Functions:

function deposit(uint256 assets, address receiver) returns (uint256 shares)
function withdraw(uint256 assets, address receiver, address owner) returns (uint256 shares)
function totalAssets() returns (uint256)
function convertToShares(uint256 assets) returns (uint256 shares)

StrategyManager.sol

Orchestrates multiple yield strategies with custom allocations:

Registers and manages up to 10 strategies
Allocates funds based on basis point percentages
Executes automated rebalancing
Harvests rewards from all strategies
Emergency withdrawal capabilities

Key Functions:

function addStrategy(address strategy, uint256 allocationBps)
function depositToStrategies(uint256 amount)
function withdrawFromStrategies(uint256 amount) returns (uint256)
function rebalance()
function harvestAll()

Strategy Contracts

BaseStrategy.sol

Abstract base contract providing common functionality:

Standardized deposit/withdraw interface
Harvest and emergency withdrawal logic
Owner and vault access controls
Token rescue functionality

AaveStrategy.sol

Aave V3 lending integration:

Supplies assets to Aave lending pools
Earns interest on supplied assets (aTokens)
Calculates real-time APY from Aave
Emergency withdrawal to vault

CompoundStrategy.sol

Compound V3 (Comet) integration:

Supplies assets to Compound markets
Earns supply interest
Claims COMP token rewards
APY calculation from supply rate

🚀 Getting Started

Prerequisites

Important: Hardhat 2.22.x requires Node.js 18.x or 20.x LTS. Node.js 22.x is not yet fully supported.

Recommended Setup:

# Install Node.js 20 LTS using nvm-windows
nvm install 20
nvm use 20

Verify Installation:

node --version  # Should show v20.x.x
npm --version

Installation

Clone the repository

git clone https://github.com/flexyledger/defi-yield-aggregator.git
cd defi-yield-aggregator

Install dependencies

npm install

Set up environment variables

cp .env.example .env
# Edit .env with your configuration:
# - PRIVATE_KEY: Your deployment wallet private key
# - SEPOLIA_RPC_URL: Infura/Alchemy Sepolia endpoint
# - MAINNET_RPC_URL: Mainnet RPC endpoint
# - ETHERSCAN_API_KEY: For contract verification

Compile Contracts

npm run compile
# or
npx hardhat compile

Run Tests

npm test
# or
npx hardhat test

Deploy

Local Network:

# Terminal 1: Start local node
npm run node

# Terminal 2: Deploy
npm run deploy:local

Sepolia Testnet:

npm run deploy:sepolia

🗺 Development Roadmap

✅ Phase 1: Smart Contract Development (Completed)

🔄 Phase 2: Frontend Development (In Progress)

📋 Phase 3: Integration & Testing (Planned)

Frontend-contract integration
Testnet deployment (Sepolia)
Mainnet fork testing
Security static analysis (Slither, Mythril)
Fuzz testing with Foundry
Gas optimization benchmarks

🚀 Phase 4: Deployment & Launch (Planned)

📊 Progress: 1/4 phases complete (25%)

⚠️ Known Issues

Node.js 22 Compatibility

Issue: Hardhat 2.22.x has module resolution conflicts with Node.js 22.x Error: ERR_MODULE_NOT_FOUND: Cannot find module 'hardhat/types/network'

Solution: Downgrade to Node.js 20 LTS

nvm install 20
nvm use 20
npm install
npx hardhat compile

Pending Implementation

Curve Strategy: Not yet implemented (scheduled for Phase 1 completion)
Router Contract: Planned for DEX integration optimization
Unit Tests: Test suite to be added in Phase 3
Frontend: React dashboard in Phase 2

🔒 Security

Implemented Security Measures

✅ OpenZeppelin battle-tested contracts
✅ ReentrancyGuard on all external functions
✅ Pausable vault for emergency scenarios
✅ Role-based access control (Admin, Strategist, Guardian)
✅ Withdrawal fee limits (max 1%)
✅ Performance fee limits (max 20%)

Pending Security Steps

⏳ Comprehensive test coverage (>90% target)
⏳ Static analysis (Slither, Mythril)
⏳ Fuzz testing (Foundry)
⏳ External security audit
⏳ Bug bounty program

Warning: This code is NOT AUDITED. Do not use in production without proper security review.

🤝 Contributing

Contributions are welcome! Please follow these steps:

Fork the repository
Create a feature branch (git checkout -b feature/amazing-feature)
Commit your changes (git commit -m 'Add amazing feature')
Push to the branch (git push origin feature/amazing-feature)
Open a Pull Request

Development Guidelines

Follow Solidity style guide
Add NatSpec documentation to all contracts
Write tests for new features
Optimize for gas efficiency
Use meaningful commit messages

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

📞 Contact & Links

GitHub: flexycode/defi-yield-aggregator
Documentation: Phase Implementation Docs
Issues: Report bugs

🙏 Acknowledgments

OpenZeppelin - Secure smart contract libraries
Hardhat - Ethereum development environment
Aave - Lending protocol integration
Compound - Money market protocol
ERC-4626 - Tokenized vault standard

Built with ❤️ for the DeFi ecosystem

⬆ Back to Top

Name		Name	Last commit message	Last commit date
Latest commit History 10 Commits
contracts		contracts
docs		docs
frontend		frontend
scripts		scripts
test		test
.env.example		.env.example
.gitignore		.gitignore
LICENSE		LICENSE
README.md		README.md
hardhat.config.js		hardhat.config.js
package-lock.json		package-lock.json
package.json		package.json
tsconfig.json		tsconfig.json

Folders and files

Latest commit

History

Repository files navigation

DeFi Yield Aggregator

📋 Table of Contents

🎯 Overview

Key Objectives

✨ Features

Implemented (Phase 1) ✅

Planned Features

🛠 Technology Stack

📁 Project Structure

📜 Smart Contracts

Core Contracts

Vault.sol

StrategyManager.sol

Strategy Contracts

BaseStrategy.sol

AaveStrategy.sol

CompoundStrategy.sol

🚀 Getting Started

Prerequisites

Installation

Compile Contracts

Run Tests

Deploy

🗺 Development Roadmap

✅ Phase 1: Smart Contract Development (Completed)

🔄 Phase 2: Frontend Development (In Progress)

📋 Phase 3: Integration & Testing (Planned)

🚀 Phase 4: Deployment & Launch (Planned)

⚠️ Known Issues

Node.js 22 Compatibility

Pending Implementation

🔒 Security

Implemented Security Measures

Pending Security Steps

🤝 Contributing

Development Guidelines

📄 License

📞 Contact & Links

🙏 Acknowledgments

About

Resources

License

Uh oh!

Stars

Watchers

Forks

Releases

Packages 0

Uh oh!

Contributors

Uh oh!

Languages

Packages