Architecture

System Overview

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The fUSD Protocol consists of a sophisticated DeFi infrastructure that provides users with a Meta Vault-collateralized stablecoin and yield generation system. The architecture is built around four core components:

1. fUSD Stablecoin Layer - Meta Vault-collateralized stablecoin backed by diversified yield strategies

2. sfUSD Staking Layer - Yield-bearing shares representing staked fUSD with exclusive yield access

3. Meta Vault System - Advanced vault architecture extending ERC-4626 with multi-strategy management

4. Automated Yield Optimization - Chainlink Automation-powered dynamic rebalancing using Exponential.fi analytics

Core Component

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fUSD Contract

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• Purpose: ERC-20 stablecoin pegged 1:1 to USD, collateralized by Meta Vault assets

• Backing: Meta Vault containing diversified yield strategies across multiple protocols

• Yield Access: Only sfUSD stakers can claim generated yield

• Functionality: Minting through deposits, emergency pause capability

• Access Control: Emergency role for pausing, default admin for role management

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ManagerStableVault Contract

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• Purpose: Configuration and risk management for fUSD minting

• Functionality: Asset whitelisting, deposit limits, vault parameters

• Collateralization: Ensures sufficient Meta Vault backing for minted fUSD

• Access Control: Manager role for asset configuration

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sfUSD Contract

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• Purpose: Staking shares representing fUSD positions with exclusive yield access

• Key Features: Non-rebasing design, claimable yield, lockup periods

• Yield Exclusivity: Only sfUSD holders can claim Meta Vault generated yield

• Fee Structure: Deposit, withdrawal, performance, and management fees

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Meta Vault System

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• Purpose: Advanced multi-strategy vault

• Innovation: Enhanced functionality beyond standard ERC-4626 capabilities

• Integration: Multiple underlying vaults and protocols

• Optimization: Dynamic rebalancing for yield maximization

Meta Vault Architecture

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The system employs a Meta Vault architecture that extends ERC-4626 concepts with enhanced functionality:

• Enhanced Vault System: Custom Meta Vault extending ERC-4626 architecture with additional features

• Multi-Protocol Integration: Underlying vaults across various DeFi protocols

• Dynamic Optimization: Automated rebalancing using Exponential.fi analytics

• Collateralization Model: Meta Vault assets serve as collateral for fUSD minting

Automated Yield Optimization

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Chainlink Automation Integration

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• Dynamic Rebalancing: Automated strategy rebalancing based on yield opportunities

• Analytics: Multiple services feed advanced yield opportunity rankings and risk analysis

• Optimization Algorithm: Sophisticated rebalancing logic for APR maximization

• Real-time Execution: Automated execution of optimal allocation strategies

Data Flow

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1. Minting Flow: User deposits stablecoin → fUSD minted (collateralized by Meta Vault)

2. Staking Flow: User stakes fUSD → sfUSD shares minted → Gains yield access rights

3. Yield Flow: Meta Vault generates yield → Only sfUSD holders can claim yield

4. Optimization Flow: Chainlink Automation + Data feeds (Defillama,Exponential,Credora) → Dynamic rebalancing

5. Withdrawal Flow: User requests withdrawal → Meta Vault processes → Funds returned