--- name: algo-trading-d811d4405ced description: >- Build algorithmic trading systems — backtesting, strategy development, live execution, and risk management. Use when tasks involve backtesting trading strategies, connecting to exchange APIs (Binance, Alpaca, Interactive Brokers), implementing technical indicators, portfolio optimization, order execution, risk management rules, market data processing, or building trading bots. Covers both crypto and traditional markets. license: Apache-2.0 compatibility: "No special requirements" metadata: author: terminal-skills version: "1.1.0" category: data-ai tags: "trading, algorithmic, backtesting, finance, quantitative" --- # Algorithmic Trading ## Overview Build, backtest, and deploy algorithmic trading strategies. Cover market data ingestion, strategy development, backtesting with realistic assumptions, risk management, and live execution. ## Instructions ### Architecture ``` Market Data → Data Pipeline → Strategy Engine → Risk Manager → Order Executor → Exchange ↑ ↓ ↓ └──────────── Performance Monitor ←────── Position Tracker ←────────┘ ``` ### Data pipeline ```python # data_fetcher.py — Fetch historical OHLCV data import ccxt import yfinance as yf def fetch_crypto_ohlcv(symbol: str, timeframe: str, since: str) -> list: """Fetch candles from Binance. Returns [timestamp, O, H, L, C, V].""" exchange = ccxt.binance() ohlcv = exchange.fetch_ohlcv(symbol, timeframe, since=exchange.parse8601(since), limit=1000) return ohlcv def fetch_stock_data(ticker: str, period: str = '2y', interval: str = '1d'): """Fetch stock OHLCV from Yahoo Finance (auto-adjusted prices).""" df = yf.download(ticker, period=period, interval=interval, auto_adjust=True) # yfinance 1.x returns MultiIndex columns (Price, Ticker) even for one ticker; # flatten and lowercase them so calculate_signals() finds df['close'] df.columns = [c.lower() for c in df.columns.get_level_values(0)] # 'Close' -> 'close' return df ``` For real-time data, use WebSocket feeds. CCXT Pro ships with the `ccxt` package as `ccxt.pro`: ```python import asyncio import ccxt.pro as ccxtpro async def stream_orderbook(symbol: str = 'BTC/USDT', updates: int = 100): exchange = ccxtpro.binance() try: for _ in range(updates): ob = await exchange.watch_order_book(symbol) spread = (ob['asks'][0][0] - ob['bids'][0][0]) / ob['bids'][0][0] * 100 print(f"{symbol} Spread: {spread:.4f}%") finally: await exchange.close() # always close the WebSocket connection asyncio.run(stream_orderbook()) ``` ### Strategy development **Common types**: Momentum/trend following (MAs, RSI, MACD), mean reversion (z-scores, Bollinger Bands), statistical arbitrage (pairs trading, cross-exchange), market making (spread capture). ```python # strategy.py — Dual Moving Average Crossover with RSI filter import pandas as pd def calculate_signals(df: pd.DataFrame, fast=20, slow=50, rsi_period=14): """Generate trading signals from OHLCV data.""" df['sma_fast'] = df['close'].rolling(window=fast).mean() df['sma_slow'] = df['close'].rolling(window=slow).mean() delta = df['close'].diff() gain = delta.where(delta > 0, 0).rolling(window=rsi_period).mean() loss = (-delta.where(delta < 0, 0)).rolling(window=rsi_period).mean() df['rsi'] = 100 - (100 / (1 + gain / loss)) df['signal'] = 0 df.loc[(df['sma_fast'] > df['sma_slow']) & (df['sma_fast'].shift(1) <= df['sma_slow'].shift(1)) & (df['rsi'] < 70), 'signal'] = 1 # Buy df.loc[(df['sma_fast'] < df['sma_slow']) & (df['sma_fast'].shift(1) >= df['sma_slow'].shift(1)) & (df['rsi'] > 30), 'signal'] = -1 # Sell return df ``` ### Backtesting A backtest must model real conditions — fees, slippage, and stop-losses: ```python # backtester.py — Vectorized backtester with realistic assumptions from dataclasses import dataclass @dataclass(frozen=True) class BacktestConfig: commission: float = 0.001 # 0.1% per trade slippage: float = 0.0005 # 0.05% estimated initial_capital: float = 10000 position_size: float = 0.1 # 10% of portfolio per trade stop_loss: float = 0.02 # 2% stop-loss take_profit: float = 0.06 # 6% take-profit (3:1 R/R) ``` **Key metrics:** ``` RETURNS: Total Return, Annualized Return, Alpha (vs buy-and-hold) RISK: Max Drawdown (<15%), Sharpe Ratio (>1.0 good, >2.0 excellent), Sortino, Calmar TRADING: Win Rate (>45% for trend, >55% for mean reversion), Profit Factor (>1.5) ``` ### Risk management **Position sizing**: Fixed fractional (X% per trade) or Kelly Criterion (f = (bp - q) / b, use half-Kelly for safety). ```python # risk_manager.py — Enforce risk rules before every order RISK_RULES = { 'max_position_pct': 0.10, # Max 10% per position 'max_portfolio_risk': 0.02, # Max 2% risk per trade 'max_daily_loss': 0.05, # Stop after 5% daily loss 'max_drawdown': 0.15, # Stop after 15% drawdown 'max_correlation': 0.7, # No correlated positions } ``` ### Live execution ```python # executor.py — Live orders with safety checks def place_order(exchange, symbol, side, amount, order_type='limit', price=None): ticker = exchange.fetch_ticker(symbol) if order_type == 'market': spread = (ticker['ask'] - ticker['bid']) / ticker['bid'] * 100 if spread > 0.5: raise ValueError(f"Spread too wide: {spread:.2f}%") if order_type == 'limit' and price: deviation = abs(price - ticker['last']) / ticker['last'] * 100 if deviation > 2.0: raise ValueError(f"Limit price {deviation:.1f}% from market") return exchange.create_order(symbol, order_type, side, amount, price) ``` Always paper trade first. Alpaca's `TradingClient` defaults to `paper=True` (alpaca-py); for ccxt exchanges call `exchange.set_sandbox_mode(True)`, which points Binance at its testnet endpoints (spot `testnet.binance.vision`, USD-M futures `testnet.binancefuture.com`). Interactive Brokers paper trading runs through TWS or IB Gateway on a paper login. Run 1 month or 100 trades minimum before live capital. API keys come from environment variables, never from source files. Use trade-only keys with withdrawals disabled and an IP allowlist where the exchange supports it. ## Examples ### Build a crypto momentum strategy ```prompt Build a momentum trading strategy for BTC/USDT on Binance. Use EMA crossover (12/26) with volume confirmation and RSI filter. Backtest on 2 years of hourly data with realistic fees (0.1% taker), calculate Sharpe ratio and max drawdown, and compare against buy-and-hold. Include stop-loss at 2% and take-profit at 6%. ``` The result is a `backtester.py` plus a report table: total return, Sharpe, max drawdown and buy-and-hold return side by side. The report must state the fee and slippage assumptions used. If the strategy does not beat buy-and-hold on risk-adjusted terms, the skill's guidance is to drop it rather than tune it on the same data. ### Create a pairs trading system ```prompt Build a statistical arbitrage system that trades correlated stock pairs. Use cointegration testing to find pairs from the S&P 500, implement a z-score mean reversion strategy, and backtest with transaction costs. Include the pair selection process, entry/exit rules, and risk management. ``` The result is a pair-selection script that lists the cointegrated pairs with their p-values and hedge ratios, a z-score backtest with entry at |z| > 2 and exit at |z| < 0.5, and a per-pair and portfolio P&L after transaction costs. Pairs chosen on the full sample and then backtested on the same data are a look-ahead error; the pair selection must use a formation window that ends before the test window starts. ### Set up a live trading bot with risk management ```prompt Deploy a live trading bot on Alpaca for US stocks. It should run a simple momentum strategy on a universe of 20 liquid ETFs, execute via limit orders, enforce position size limits (max 10% per holding), and stop trading if daily loss exceeds 2%. Include monitoring, logging, and alerting via Telegram. ``` The result is a bot that runs as a service, writes every order and risk check to a log, sends a Telegram message on each fill and on the daily-loss stop, and refuses new orders once the 2% limit trips until the next session. ## Guidelines - Always backtest with realistic fees, slippage, and stop-losses — unrealistic backtests are worthless - Never skip paper trading — run for at least 1 month or 100 trades before deploying live capital - Use half-Kelly criterion for position sizing to add a safety margin - Implement hard daily loss limits and max drawdown circuit breakers - Check spread width before market orders — never market-order into thin books - Compare every strategy against buy-and-hold; if it underperforms, it's not worth the complexity - Log every order, signal, and risk check for post-mortem analysis - Keep API keys in environment variables and out of the repository; a trading key should never have withdrawal permission - Treat backtest results as hypotheses: a strategy tuned on one data window must be re-tested on a later, untouched window --- Source attribution: terminal-skills Original project: https://github.com/TerminalSkills/skills/blob/8a9852d489f274538be9bf1c9121aeb403750b1c/skills/algo-trading/SKILL.md License: Apache-2.0 License information: https://www.apache.org/licenses/LICENSE-2.0 Original upstream instructions; downloaded from Mega AI Hub. ## Upstream license notice Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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See the License for the specific language governing permissions and limitations under the License. # Mega AI Hub resource metadata Creator / publisher: terminal-skills Original project: https://github.com/TerminalSkills/skills/blob/8a9852d489f274538be9bf1c9121aeb403750b1c/skills/algo-trading/SKILL.md Attribution basis: Source repository record Fields of work: Finance & Accounting, Data & Analytics, Marketing, Product Management, Sales Roles: Financial Analyst, Data Scientist, Growth Marketer, Product Manager, Business Development Specialties: API, Backend Tools: Ccxt, Yfinance Country applicability: Country not specified Classification basis: Source category, role and specialization labels Instruction SHA-256: 1cd4873c077895f947a118811e22e986351cd4aa2cac9e7baea769bde093425c