---
id: organvm/a-i--skills/defi-trading-systems
version: "99288bd5"
license: Apache-2.0
install: manual
updated: 2026-07-22
---

# defi-trading-systems — DeFi Trading Systems guides you through building decentralized trading infrastructure focused on perpetual futures, automated market makers, and risk management. Learn position sizing, liquidation prevention, funding rate arbitrage, and MEV protection strategies to secure your trading operations.

Publisher: organvm · Stars: 14 · Updated: 2026-07-22

Install (manual): `git clone https://github.com/organvm/a-i--skills`

## SKILL.md

# DeFi Trading Systems

This skill provides guidance for building decentralized finance trading systems, with focus on perpetual futures, automated market makers, and risk management.

## Core Competencies

- **Perpetual Futures**: Funding rates, leverage, liquidation mechanics
- **Automated Market Makers**: Liquidity provision, impermanent loss
- **Risk Management**: Position sizing, stop losses, portfolio hedging
- **MEV Protection**: Sandwich attacks, frontrunning mitigation

## DeFi Trading Fundamentals

### Perpetual Futures Mechanics

```
Traditional Futures:              Perpetual Futures:
┌─────────────────┐              ┌─────────────────┐
│   Expiry Date   │              │   No Expiry     │
│   Settlement    │              │   Funding Rate  │
│   Roll Cost     │              │   Continuous    │
└─────────────────┘              └─────────────────┘

Funding Rate = (Mark Price - Index Price) / Index Price × Interval

If funding > 0: Longs pay Shorts
If funding < 0: Shorts pay Longs
```

### Key Concepts

| Term | Definition |
|------|------------|
| Mark Price | Fair value used for liquidation |
| Index Price | Spot price from exchanges |
| Funding Rate | Periodic payment between longs/shorts |
| Maintenance Margin | Minimum equity to avoid liquidation |
| Liquidation Price | Price at which position is forcibly closed |

## Position Management

### Position Sizing

```python
from dataclasses import dataclass
from decimal import Decimal

@dataclass
class Position:
    symbol: str
    side: str  # 'long' or 'short'
    size: Decimal
    entry_price: Decimal
    leverage: int
    margin: Decimal

    @property
    def notional_value(self) -> Decimal:
        return self.size * self.entry_price

    @property
    def liquidation_price(self) -> Decimal:
        """Calculate liquidation price"""
        maintenance_margin_rate = Decimal('0.005')  # 0.5%

        if self.side == 'long':
            # Liq price = Entry × (1 - Initial Margin + Maintenance Margin)
            return self.entry_price * (
                1 - (1 / self.leverage) + maintenance_margin_rate
            )
        else:
            return self.entry_price * (
                1 + (1 / self.leverage) - maintenance_margin_rate
            )

    def unrealized_pnl(self, current_price: Decimal) -> Decimal:
        """Calculate unrealized P&L"""
        if self.side == 'long':
            return self.size * (current_price - self.entry_price)
        else:
            return self.size * (self.entry_price - current_price)

    def roi_percent(self, current_price: Decimal) -> Decimal:
        """Return on investment percentage"""
        pnl = self.unrealized_pnl(current_price)
        return (pnl / self.margin) * 100


class PositionSizer:
    """Calculate position sizes based on risk parameters"""

    def __init__(self, account_balance: Decimal):
        self.balance = account_balance
        self.max_risk_per_trade = Decimal('0.02')  # 2% of account
        self.max_leverage = 10

    def calculate_size(
        self,
        entry_price: Decimal,
        stop_loss_price: Decimal,
        leverage: int
    ) -> dict:
        """Calculate position size for given risk parameters"""
        # Limit leverage
        leverage = min(leverage, self.max_leverage)

        # Risk amount
        risk_amount = self.balance * self.max_risk_per_trade

        # Price distance to stop
        price_distance = abs(entry_price - stop_loss_price)
        price_distance_pct = price_distance / entry_price

        # Position size based on risk
        # size × price_distance = risk_amount
        size = risk_amount / price_distance

        # Check margin requirements
        required_margin = (size * entry_price) / leverage

        if required_margin > self.balance:
            # Reduce size to fit available margin
            size = (self.balance * leverage) / entry_price

        return {
            'size': size,
            'leverage': leverage,
            'margin_required': (size * entry_price) / leverage,
            'risk_amount': size * price_distance,
            'risk_percent': (size * price_distance / self.balance) * 100
        }
```

### Liquidation Prevention

```python
class LiquidationMonitor:
    """Monitor positions for liquidation risk"""

    def __init__(self, warning_threshold: float = 0.8):
        self.warning_threshold = warning_threshold
        self.positions: dict[str, Position] = {}

    def check_health(self, position: Position, current_price: Decimal) -> dict:
        """Calculate position health metrics"""
        liq_price = position.liquidation_price

        if position.side == 'long':
            distance_to_liq = (current_price - liq_price) / current_price
        else:
            distance_to_liq = (liq_price - current_price) / current_price

        # Health ratio: 1.0 = max health, 0.0 = liquidation
        health_ratio = distance_to_liq / (1 / position.leverage)

        return {
            'liquidation_price': liq_price,
            'distance_percent': float(distance_to_liq) * 100,
            'health_ratio': float(health_ratio),
            'at_risk': health_ratio < self.warning_threshold,
            'margin_ratio': self._calculate_margin_ratio(position, current_price)
        }

    def _calculate_margin_ratio(
        self,
        position: Position,
        current_price: Decimal
    ) -> float:
        """Calculate current margin ratio"""
        pnl = position.unrealized_pnl(current_price)
        equity = position.margin + pnl
        return float(equity / position.notional_value)
```

## Funding Rate Strategies

### Funding Rate Arbitrage

```python
from typing import List
import asyncio

@dataclass
class FundingRateInfo:
    exchange: str
    symbol: str
    funding_rate: Decimal
    next_funding_time: int
    mark_price: Decimal
    index_price: Decimal

class FundingArbitrage:
    """Capture funding rate differentials"""

    def __init__(self, exchanges: List[str]):
        self.exchanges = exchanges
        self.min_rate_threshold = Decimal('0.0001')  # 0.01%

    async def find_opportunities(self, symbol: str) -> List[dict]:
        """Find funding rate arbitrage opportunities"""
        rates = await self._fetch_all_rates(symbol)

        opportunities = []

        # Sort by funding rate
        rates.sort(key=lambda x: x.funding_rate)

        # Find extremes
        lowest = rates[0]
        highest = rates[-1]

        spread = highest.funding_rate - lowest.funding_rate

        if spread > self.min_rate_threshold:
            opportunities.append({
                'type': 'cross_exchange',
                'long_exchange': lowest.exchange,
                'short_exchange': highest.exchange,
                'expected_return': spread,
                'annualized_return': spread * 3 * 365  # 8-hour funding
            })

        # Spot-perp basis trade
        for rate in rates:
            if abs(rate.funding_rate) > self.min_rate_threshold:
                opportunities.append({
                    'type': 'basis_trade',
                    'exchange': rate.exchange,
                    'direction': 'short_perp_long_spot' if rate.funding_rate > 0
                                 else 'long_perp_short_spot',
                    'expected_return': abs(rate.funding_rate),
                    'mark_index_spread': rate.mark_price - rate.index_price
                })

        return opportunities

    def calculate_basis_trade_pnl(
        self,
        funding_received: Decimal,
        entry_costs: Decimal,
        price_change_pnl: Decimal
    ) -> dict:
        """Calculate P&L for basis trade"""
        gross_pnl = funding_received + price_change_pnl
        net_pnl = gross_pnl - entry_costs

        return {
            'funding_pnl': funding_received,
            'price_pnl': price_change_pnl,  # Should be ~0 if hedged
            'costs': entry_costs,
            'net_pnl': net_pnl
        }
```

## AMM and Liquidity Provision

### Impermanent Loss Calculator

```python
import math

def calculate_impermanent_loss(price_ratio: float) -> float:
    """
    Calculate impermanent loss for a constant product AMM

    price_ratio: new_price / original_price

    Returns: IL as negative percentage (e.g., -0.05 for 5% loss)
    """
    # IL = 2 * sqrt(price_ratio) / (1 + price_ratio) - 1
    return 2 * math.sqrt(price_ratio) / (1 + price_ratio) - 1


def lp_value_vs_holding(
    initial_token_a: float,
    initial_token_b: float,
    initial_price: float,
    final_price: float
) -> dict:
    """Compare LP position value vs just holding"""
    # Initial value
    initial_value = initial_token_a * initial_price + initial_token_b

    # If just held
    hold_value = initial_token_a * final_price + initial_token_b

    # LP position (constant product: x * y = k)
    k = initial_token_a * initial_token_b
    # At new price: token_a_new * price = token_b_new (equal value)
    # token_a_new * token_b_new = k
    token_a_new = math.sqrt(k / final_price)
    token_b_new = math.sqrt(k * final_price)

    lp_value = token_a_new * final_price + token_b_new

    return {
        'initial_value': initial_value,
        'hold_value': hold_value,
        'lp_value': lp_value,
        'impermanent_loss': lp_value - hold_value,
        'il_percent': (lp_value - hold_value) / hold_value * 100,
        'new_token_a': token_a_new,
        'new_token_b': token_b_new
    }
```

### Concentrated Liquidity (Uniswap V3 Style)

```python
@dataclass
class LPPosition:
    """Concentrated liquidity position"""
    lower_tick: int
    upper_tick: int
    liquidity: Decimal
    token_a_deposited: Decimal
    token_b_deposited: Decimal

    @property
    def price_range(self) -> tuple[float, float]:
        """Convert ticks to prices"""
        return (
            1.0001 ** self.lower_tick,
            1.0001 ** self.upper_tick
        )

    def in_range(self, current_price: float) -> bool:
        """Check if current price is in position range"""
        lower, upper = self.price_range
        return lower <= current_price <= upper


class ConcentratedLPCalculator:
    """Calculate metrics for concentrated liquidity positions"""

    def calculate_liquidity(
        self,
        amount_a: Decimal,
        amount_b: Decimal,
        price_lower: float,
        price_upper: float,
        current_price: float
    ) -> Decimal:
        """Calculate liquidity value for given deposit"""
        sqrt_price = math.sqrt(current_price)
        sqrt_lower = math.sqrt(price_lower)
        sqrt_upper = math.sqrt(price_upper)

        if current_price <= price_lower:
            # All in token A
            liquidity = float(amount_a) * (sqrt_lower * sqrt_upper) / (sqrt_upper - sqrt_lower)
        elif current_price >= price_upper:
            # All in token B
            liquidity = float(amount_b) / (sqrt_upper - sqrt_lower)
        else:
            # Mixed
            liquidity_a = float(amount_a) * (sqrt_price * sqrt_upper) / (sqrt_upper - sqrt_price)
            liquidity_b = float(amount_b) / (sqrt_price - sqrt_lower)
            liquidity = min(liquidity_a, liquidity_b)

        return Decimal(str(liquidity))

    def calculate_position_value(
        self,
        position: LPPosition,
        current_price: float
    ) -> dict:
        """Calculate current value of LP position"""
        sqrt_price = math.sqrt(current_price)
        lower, upper = position.price_range
        sqrt_lower = math.sqrt(lower)
        sqrt_upper = math.sqrt(upper)

        liquidity = float(position.liquidity)

        if current_price <= lower:
            amount_a = liquidity * (sqrt_upper - sqrt_lower) / (sqrt_lower * sqrt_upper)
            amount_b = 0
        elif current_price >= upper:
            amount_a = 0
            amount_b = liquidity * (sqrt_upper - sqrt_lower)
        else:
            amount_a = liquidity * (sqrt_upper - sqrt_price) / (sqrt_price * sqrt_upper)
            amount_b = liquidity * (sqrt_price - sqrt_lower)

        return {
            'token_a': Decimal(str(amount_a)),
            'token_b': Decimal(str(amount_b)),
            'total_value_in_b': Decimal(str(amount_a * current_price + amount_b)),
            'in_range': position.in_range(current_price)
        }
```

## MEV Protection

### Understanding MEV Attacks

```
Sandwich Attack:

User wants to swap:     Attacker frontruns:    User's swap:         Attacker backruns:
Token A → Token B       Buy Token B            Worse price          Sell Token B
                        (raises price)          for user            (profit)

Timeline:
─────────────────────────────────────────────────────────────────────▶
         Attacker TX 1        User TX             Attacker TX 2
         (frontrun)           (victim)            (backrun)
```

### Protection Strategies

```python
from web3 import Web3

class MEVProtection:
    """Strategies to minimize MEV exposure"""

    def __init__(self, web3: Web3):
        self.w3 = web3

    def calculate_max_slippage(
        self,
        expected_output: Decimal,
        tolerance_percent: float = 0.5
    ) -> Decimal:
        """Calculate minimum output with slippage protection"""
        return expected_output * (1 - Decimal(str(tolerance_percent / 100)))

    def should_use_private_mempool(
        self,
        trade_size_usd: float,
        gas_price_gwei: float
    ) -> bool:
        """Determine if trade warrants private mempool"""
        # Larger trades are more attractive to MEV bots
        # Higher gas prices indicate competitive MEV environment

        mev_risk_score = (trade_size_usd / 10000) * (gas_price_gwei / 50)
        return mev_risk_score > 1.0

    def chunk_large_order(
        self,
        total_size: Decimal,
        max_chunk_size: Decimal,
        min_time_between_chunks: int = 30  # seconds
    ) -> List[dict]:
        """Split large order into smaller chunks"""
        chunks = []
        remaining = total_size

        while remaining > 0:
            chunk_size = min(remaining, max_chunk_size)
            chunks.append({
                'size': chunk_size,
                'delay': len(chunks) * min_time_between_chunks
            })
            remaining -= chunk_size

        return chunks

    def calculate_twap_schedule(
        self,
        total_size: Decimal,
        duration_minutes: int,
        num_orders: int
    ) -> List[dict]:
        """Create TWAP (Time-Weighted Average Price) schedule"""
        interval = duration_minutes / num_orders
        order_size = total_size / num_orders

        return [
            {
                'size': order_size,
                'execute_at_minute': i * interval
            }
            for i in range(num_orders)
        ]
```

### Flashbots Integration

```python
from eth_account import Account
import requests

class FlashbotsSubmitter:
    """Submit transactions via Flashbots to avoid public mempool"""

    def __init__(self, flashbots_url: str, signing_key: str):
        self.url = flashbots_url
        self.signer = Account.from_key(signing_key)

    def submit_bundle(
        self,
        signed_transactions: List[str],
        target_block: int
    ) -> dict:
        """Submit transaction bundle to Flashbots"""
        bundle = {
            "jsonrpc": "2.0",
            "id": 1,
            "method": "eth_sendBundle",
            "params": [{
                "txs": signed_transactions,
                "blockNumber": hex(target_block)
            }]
        }

        # Sign the bundle
        message = Web3.keccak(text=str(bundle))
        signature = self.signer.sign_message(message)

        headers = {
            "X-Flashbots-Signature": f"{self.signer.address}:{signature.signature.hex()}"
        }

        response = requests.post(self.url, json=bundle, headers=headers)
        return response.json()
```

## Risk Management

### Portfolio Risk Metrics

```python
import numpy as np

class RiskMetrics:
    """Calculate portfolio risk metrics"""

    def calculate_var(
        self,
        returns: List[float],
        confidence_level: float = 0.95
    ) -> float:
        """Value at Risk - maximum expected loss at confidence level"""
        return np.percentile(returns, (1 - confidence_level) * 100)

    def calculate_cvar(
        self,
        returns: List[float],
        confidence_level: float = 0.95
    ) -> float:
        """Conditional VaR - expected loss beyond VaR"""
        var = self.calculate_var(returns, confidence_level)
        return np.mean([r for r in returns if r <= var])

    def calculate_sharpe_ratio(
        self,
        returns: List[float],
        risk_free_rate: float = 0.0
    ) -> float:
        """Risk-adjusted return metric"""
        excess_returns = np.array(returns) - risk_free_rate
        return np.mean(excess_returns) / np.std(excess_returns) if np.std(excess_returns) > 0 else 0

    def calculate_max_drawdown(self, equity_curve: List[float]) -> dict:
        """Maximum peak-to-trough decline"""
        peak = equity_curve[0]
        max_dd = 0
        max_dd_start = 0
        max_dd_end = 0

        current_dd_start = 0

        for i, value in enumerate(equity_curve):
            if value > peak:
                peak = value
                current_dd_start = i

            dd = (peak - value) / peak
            if dd > max_dd:
                max_dd = dd
                max_dd_start = current_dd_start
                max_dd_end = i

        return {
            'max_drawdown': max_dd,
            'start_index': max_dd_start,
            'end_index': max_dd_end
        }


class PortfolioRiskManager:
    """Manage overall portfolio risk"""

    def __init__(self, max_portfolio_risk: float = 0.1):
        self.max_risk = max_portfolio_risk  # 10% max portfolio risk
        self.positions: List[Position] = []

    def can_add_position(
        self,
        new_position: Position,
        current_price: Decimal
    ) -> tuple[bool, str]:
        """Check if new position fits risk limits"""
        # Calculate current portfolio risk
        current_risk = self._calculate_portfolio_risk(current_price)

        # Calculate risk of new position
        new_position_risk = self._calculate_position_risk(new_position)

        # Check correlation (simplified)
        total_risk = current_risk + new_position_risk  # Assumes correlation

        if total_risk > self.max_risk:
            return False, f"Would exceed max risk: {total_risk:.2%} > {self.max_risk:.2%}"

        return True, "Position within risk limits"

    def get_risk_summary(self, current_prices: dict) -> dict:
        """Get portfolio risk summary"""
        return {
            'total_exposure': sum(p.notional_value for p in self.positions),
            'net_exposure': self._calculate_net_exposure(),
            'var_95': self._calculate_portfolio_var(0.95),
            'positions_at_risk': [
                p.symbol for p in self.positions
                if self._is_position_at_risk(p, current_prices.get(p.symbol))
            ]
        }
```

## Best Practices

### Trading System Checklist

1. **Position Management**
   - [ ] Maximum position size limits
   - [ ] Leverage limits by asset volatility
   - [ ] Automatic stop-loss orders
   - [ ] Liquidation price monitoring

2. **Risk Management**
   - [ ] Portfolio-level risk limits
   - [ ] Correlation monitoring
   - [ ] Drawdown limits with automatic deleveraging
   - [ ] Regular VaR calculations

3. **Execution**
   - [ ] MEV protection (private mempool, chunking)
   - [ ] Slippage limits on all trades
   - [ ] Gas price limits
   - [ ] Failed transaction handling

4. **Operations**
   - [ ] Hot wallet limits
   - [ ] Multi-sig for large withdrawals
   - [ ] Regular reconciliation
   - [ ] Incident response plan

## References

- `references/perpetual-mechanics.md` - Deep dive into perp math
- `references/amm-formulas.md` - AMM constant product and concentrated liquidity
- `references/mev-protection.md` - Detailed MEV mitigation strategies


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