Solana Perpetual DEX Smart Contract

A production-grade Solana smart contract for a perpetual futures DEX, inspired by Drift Protocol V2. Built with Anchor framework and designed for high-performance DeFi trading.

📋 Overview

This project implements a complete perpetual futures decentralized exchange (DEX) on Solana, supporting:

Multiple Markets: Permissioned creation of perpetual markets with configurable parameters
Leverage Trading: Long/short positions with up to 50x leverage (configurable per market)
Order Types: Limit and market orders with partial fills
vAMM: Virtual Automated Market Maker for price discovery and liquidity
Funding Rates: Periodic funding payments based on premium/discount to oracle price
Liquidations: Permissionless liquidation of undercollateralized positions
Insurance Fund: Accumulates fees to cover bad debt from liquidations
Oracle Integration: Ready for Pyth Network price feeds
Isolated Margin: Each position has isolated collateral and risk

✨ Features

Core Functionality

✅ Market Management: Create and configure perpetual markets
✅ User Accounts: Initialize user accounts and manage collateral
✅ Order Placement: Place limit and market orders
✅ Order Execution: Fill orders via vAMM with price impact calculation
✅ Position Management: Open, update, and close positions with leverage
✅ Funding Mechanism: Hourly funding rate updates and payment settlement
✅ Liquidation System: Permissionless liquidation with liquidator rewards
✅ Insurance Fund: Fee accumulation and bad debt coverage
✅ PNL Calculation: Real-time unrealized and realized PNL tracking
✅ Margin Health: Health factor calculation for liquidation checks

Security Features

✅ Access Control: Admin-only market creation and configuration
✅ Oracle Validation: Staleness and deviation checks
✅ Overflow Protection: Safe math operations throughout
✅ CEI Pattern: Checks-Effects-Interactions pattern for state updates
✅ Reentrancy Protection: Anchor's built-in account validation
✅ Input Validation: Comprehensive parameter validation

🏗️ Architecture

Account Structure

ProtocolState (Global)
├── admin: Pubkey
├── insurance_fund: Pubkey
├── fee rates, liquidation params, funding params
└── oracle parameters

PerpMarket (Per Market)
├── market_id, base/quote assets
├── oracle: Pubkey
├── max_leverage, fee rates
├── funding_rate, premium_index
├── vAMM reserves (base, quote, k)
└── funding schedule

User (Per User)
├── owner: Pubkey
├── collateral: u64
├── position_count, order_count
└── last_interaction

Position (Per User/Market)
├── user, market
├── side (long/short), size
├── entry_price, leverage
├── collateral, unrealized_pnl
└── cumulative_funding_payment

Order (Per User/Order)
├── user, market, order_id
├── side, order_type, size
├── filled_size, price
└── status (open/filled/cancelled)

InsuranceFund (Global)
├── balance: u64
├── total_fees_collected
└── total_bad_debt_covered

Instruction Flow

1. Initialize Protocol
   └─> Create ProtocolState, InsuranceFund

2. Create Market
   └─> Admin creates PerpMarket with vAMM initialization

3. User Onboarding
   ├─> Initialize User account
   └─> Deposit Collateral

4. Trading Flow
   ├─> Place Order (limit/market)
   ├─> Fill Order (via vAMM)
   ├─> Open Position (from filled order)
   └─> Update Position PNL

5. Funding Flow
   ├─> Update Funding Rate (keeper)
   └─> Settle Funding Payment (user)

6. Liquidation Flow
   ├─> Check Position Health
   ├─> Liquidate Position (permissionless)
   └─> Pay Liquidator Reward (from insurance fund)

7. Position Management
   ├─> Update Position PNL
   └─> Close Position (partial/full)

🔢 Key Algorithms

Funding Rate Calculation

The funding rate is calculated based on the premium index (deviation of mark price from oracle price):

premium_index = (mark_price - oracle_price) * PRECISION / oracle_price
funding_rate = clamp(premium_index * sensitivity, -max_rate, max_rate)

Positive funding rate: Longs pay shorts (mark > oracle)
Negative funding rate: Shorts pay longs (mark < oracle)
Default sensitivity: 10% (0.1 * PRECISION)
Default max rate: 1% per hour (0.01 * PRECISION)

Funding Payment

Funding payments are calculated per position:

payment = funding_rate * position_size * time_elapsed / funding_interval

For longs: payment = rate * size * time / interval
For shorts: payment = -rate * size * time / interval
Payments are deducted/added to collateral

Margin Health Factor

Health factor determines if a position is liquidatable:

health = (collateral + unrealized_pnl) / margin_requirement

Health < 1.0: Position is undercollateralized
Health < 0.8 (default): Position is liquidatable
Margin requirement: size * entry_price / leverage

vAMM Constant Product

The virtual AMM uses the constant product formula:

x * y = k

For buying base (input quote, output base):

new_reserve_y = reserve_y + input_quote
new_reserve_x = k / new_reserve_y
output_base = reserve_x - new_reserve_x

For selling base (input base, output quote):

new_reserve_x = reserve_x + input_base
new_reserve_y = k / new_reserve_x
output_quote = reserve_y - new_reserve_y

Unrealized PNL

PNL is calculated based on price movement:

For long: pnl = (current_price - entry_price) * size / PRECISION
For short: pnl = (entry_price - current_price) * size / PRECISION

Liquidation Bonus

Liquidators receive a bonus from the insurance fund:

bonus = liquidated_size * liquidation_price * bonus_rate / PRECISION^2

Default bonus rate: 5% (0.05 * PRECISION)
Bad debt is also covered by the insurance fund

🚀 Installation

Prerequisites

Rust (latest stable)
Solana CLI (v1.18.0+)
Anchor (v0.30.1+)
Node.js (v18+) for tests

Setup

Clone the repository

git clone <repository-url>
cd Solana-Perp-Dex-Smart-Contract-1

Install dependencies
```
anchor build
```
Run tests (when test suite is added)
```
anchor test
```

📦 Build & Deploy

Build

# Build the program
anchor build

# Build with optimizations
anchor build --release

Deploy to Localnet

# Start local validator
solana-test-validator

# Deploy (in another terminal)
anchor deploy

Deploy to Devnet

# Set cluster
solana config set --url devnet

# Airdrop SOL
solana airdrop 2 $(solana address)

# Deploy
anchor deploy --provider.cluster devnet

Deploy to Mainnet

⚠️ Warning: Only deploy to mainnet after comprehensive audits and testing.

# Set cluster
solana config set --url mainnet-beta

# Deploy
anchor deploy --provider.cluster mainnet-beta

💻 Usage Examples

Initialize Protocol

// Anchor client example
let protocol_state = Pubkey::find_program_address(
    &[b"protocol_state"],
    &program_id,
).0;

let insurance_fund = Pubkey::find_program_address(
    &[b"insurance_fund"],
    &program_id,
).0;

let tx = program
    .request()
    .accounts(InitializeProtocol {
        admin: admin.pubkey(),
        protocol_state,
        insurance_fund_token_account,
        insurance_fund,
        quote_mint,
        system_program: anchor_lang::system_program::ID,
        token_program: anchor_spl::token::ID,
        rent: anchor_lang::sysvar::rent::ID,
    })
    .signers(&[&admin])
    .send();

Create Market

let market = Pubkey::find_program_address(
    &[b"perp_market", &market_id.to_le_bytes()],
    &program_id,
).0;

let tx = program
    .request()
    .accounts(CreatePerpMarket {
        admin: admin.pubkey(),
        protocol_state,
        oracle: pyth_oracle_pubkey,
        market,
        system_program: anchor_lang::system_program::ID,
    })
    .args(
        market_id,
        "SOL".to_string(),
        "USDC".to_string(),
        20u8, // 20x max leverage
        1_000_000_000u64, // 1000 SOL initial base reserve
        50_000_000_000u64, // 50000 USDC initial quote reserve
    )
    .signers(&[&admin])
    .send();

Initialize User & Deposit

let user_account = Pubkey::find_program_address(
    &[b"user", user.pubkey().as_ref()],
    &program_id,
).0;

// Initialize user
program
    .request()
    .accounts(InitializeUser {
        user: user.pubkey(),
        user_account,
        system_program: anchor_lang::system_program::ID,
    })
    .signers(&[&user])
    .send();

// Deposit collateral
program
    .request()
    .accounts(DepositCollateral {
        user: user.pubkey(),
        user_account,
        user_token_account: user_usdc_account,
        collateral_vault: protocol_vault,
        token_program: anchor_spl::token::ID,
    })
    .args(10_000_000u64) // 10 USDC
    .signers(&[&user])
    .send();

Place & Fill Order

let order = Pubkey::find_program_address(
    &[b"order", user.pubkey().as_ref(), &order_id.to_le_bytes()],
    &program_id,
).0;

// Place limit order
program
    .request()
    .accounts(PlaceOrder {
        user: user.pubkey(),
        user_account,
        market,
        order,
        system_program: anchor_lang::system_program::ID,
    })
    .args(
        order_id,
        0u8, // long
        1u8, // limit
        1_000_000u64, // 1 SOL
        50_000_000u64, // 50 USDC per SOL
    )
    .signers(&[&user])
    .send();

// Fill order
program
    .request()
    .accounts(FillOrder {
        filler: filler.pubkey(),
        user_account,
        market,
        order,
        oracle: pyth_oracle,
        system_program: anchor_lang::system_program::ID,
    })
    .args(1_000_000u64) // fill 1 SOL
    .signers(&[&filler])
    .send();

Open Position

let position = Pubkey::find_program_address(
    &[b"position", user.pubkey().as_ref(), market.as_ref()],
    &program_id,
).0;

program
    .request()
    .accounts(OpenPosition {
        user: user.pubkey(),
        user_account,
        market,
        oracle: pyth_oracle,
        position,
        system_program: anchor_lang::system_program::ID,
    })
    .args(
        1_000_000u64, // 1 SOL
        50_000_000u64, // 50 USDC entry price
        10u8, // 10x leverage
        0u8, // long
    )
    .signers(&[&user])
    .send();

Update Funding Rate

// Called by keeper bot
let oracle_price = get_pyth_price(&pyth_oracle)?;

program
    .request()
    .accounts(UpdateFundingRate {
        updater: keeper.pubkey(),
        market,
        oracle: pyth_oracle,
    })
    .args(oracle_price)
    .signers(&[&keeper])
    .send();

Liquidate Position

let current_price = get_pyth_price(&pyth_oracle)?;

program
    .request()
    .accounts(LiquidatePosition {
        liquidator: liquidator.pubkey(),
        user_account,
        market,
        position,
        insurance_fund,
        insurance_fund_token_account,
        liquidator_token_account,
        oracle: pyth_oracle,
        protocol_state,
        token_program: anchor_spl::token::ID,
    })
    .args(
        position.size, // liquidate full position
        current_price,
    )
    .signers(&[&liquidator])
    .send();

🧪 Testing

Unit Tests

Unit tests for math utilities and state validation:

cargo test

Integration Tests

Integration tests using Anchor's test framework:

anchor test

Test Coverage

Key test scenarios:

✅ Market creation and configuration
✅ User account initialization and collateral management
✅ Order placement, filling, and cancellation
✅ Position opening, PNL updates, and closing
✅ Funding rate calculation and payment settlement
✅ Liquidation scenarios (various health factors)
✅ Insurance fund deposits and usage
✅ Edge cases (overflow, underflow, division by zero)
✅ Access control and authorization
✅ Oracle staleness and deviation checks

🔒 Security Considerations

⚠️ Important Disclaimers

Educational Purpose: This codebase is designed for educational purposes and as a reference implementation. It should NOT be used in production without comprehensive security audits.
No Warranty: The code is provided "as is" without any warranty. Use at your own risk.
Audit Required: Before any mainnet deployment, the contract must undergo:
- Professional security audits
- Formal verification where possible
- Extensive testing on testnets
- Bug bounty programs

Known Limitations

Oracle Integration: Oracle price feeds are stubbed. Full Pyth integration requires additional CPI calls and account validation.
Orderbook: Currently only vAMM is implemented. Full orderbook matching would require additional data structures.
Partial Liquidations: Liquidation logic supports partial liquidations but may need refinement for edge cases.
Gas Optimization: Some operations may be optimized further for production use.

Security Best Practices

✅ All math operations use checked arithmetic
✅ Input validation on all user inputs
✅ Access control checks on admin functions
✅ Oracle staleness and deviation validation
✅ CEI pattern for state updates
✅ Comprehensive error handling

Recommendations for Production

Oracle Integration: Implement full Pyth Network integration with proper account validation
Circuit Breakers: Add circuit breakers for extreme market conditions
Rate Limiting: Implement rate limiting for critical operations
Monitoring: Add comprehensive logging and monitoring
Upgradeability: Consider upgradeable program architecture
Multi-sig: Use multi-sig for admin operations
Insurance: Consider additional insurance mechanisms

📚 Documentation

Code Structure

programs/solana-perp-dex-smart-contract/
├── src/
│   ├── lib.rs              # Main program entry point
│   ├── state.rs            # Account structs (ProtocolState, PerpMarket, User, Position, Order, InsuranceFund)
│   ├── errors.rs           # Custom error codes
│   ├── events.rs           # Event definitions
│   ├── math.rs             # Math utilities (funding, PNL, margin, vAMM)
│   └── instructions/       # Instruction implementations
│       ├── mod.rs
│       ├── initialize.rs   # Protocol initialization
│       ├── market.rs       # Market creation and configuration
│       ├── user.rs         # User account and collateral management
│       ├── order.rs        # Order placement, filling, cancellation
│       ├── position.rs     # Position management
│       ├── funding.rs      # Funding rate updates and settlement
│       ├── liquidation.rs  # Position liquidation
│       └── insurance.rs    # Insurance fund management
├── Cargo.toml              # Dependencies
└── Anchor.toml             # Anchor configuration

Key Constants

PRECISION: 1_000_000 (1e6) - Fixed-point precision for all calculations
Default Maker Fee: 0.1% (1_000 / PRECISION)
Default Taker Fee: 0.2% (2_000 / PRECISION)
Default Liquidation Threshold: 80% (800_000 / PRECISION)
Default Liquidation Bonus: 5% (50_000 / PRECISION)
Default Funding Interval: 3600 seconds (1 hour)
Default Max Funding Rate: 1% per hour (10_000 / PRECISION)
Default Max Oracle Staleness: 60 seconds
Default Max Oracle Deviation: 5% (50_000 / PRECISION)

🤝 Contributing

Contributions are welcome! Please follow these guidelines:

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

Code Style

Follow Rust formatting (cargo fmt)
Run clippy (cargo clippy)
Add comments for complex logic
Write tests for new features

📄 License

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

🙏 Acknowledgments

Inspired by Drift Protocol V2
Built with Anchor Framework
Designed for the Solana Blockchain

📞 Contact

telegram: https://t.me/codiiman
twitter: https://x.com/codiiman_

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