Alpaca Review: Is Algorithmic Trading Accessible Now?

What Is Alpaca?

Alpaca Markets is a technology company that provides commission-free stock and crypto trading via API. Unlike traditional brokerages built around graphical interfaces, Alpaca is designed API-first for developers who want to build and deploy automated trading strategies. The platform supports REST and WebSocket APIs, offers both paper and live trading environments, and provides market data feeds. Founded in 2015, Alpaca has grown rapidly by targeting the underserved niche of individual developers and small quantitative trading teams who need institutional-quality infrastructure without institutional-level costs. Alpaca is one of several AI trading platforms changing the game, and it sits at the developer-heavy end of that spectrum.

Getting Started: The Developer Experience

From signup to first trade in under 30 minutes, if you know your way around an API.

Setting up an Alpaca account is straightforward. After identity verification, you receive API keys for both paper and live trading environments. The documentation is excellent and includes quickstart guides for Python, JavaScript, Go, and C#. We had a paper trading bot running within 20 minutes of signing up, using the official alpaca-py Python SDK. The paper trading environment mirrors live markets with real-time data, making it genuinely useful for strategy development. One minor friction point: the account approval process for live trading can take 2-3 business days, which is standard for brokerages but worth noting if you are eager to go live.

• API-first design with SDKs for Python, JavaScript, Go, and C#.
• Paper trading with real market data for risk-free strategy testing.
• WebSocket streaming for real-time price updates and order status.
• OAuth support for building multi-user trading applications.
• Comprehensive documentation with code examples for every endpoint.

Market Data and Execution Quality

Commission-free does not mean compromise-free. Here is what we found.

Alpaca offers two tiers of market data. The free tier provides IEX exchange data, which covers roughly 2-3% of market volume. The paid tier at $9/month for individuals provides full SIP data from all exchanges, which is essential for serious algorithmic trading. In our testing, execution quality was solid: market orders filled quickly during regular hours, and limit orders behaved as expected. Slippage was minimal on liquid large-cap stocks but noticeable on smaller, less liquid names, which is typical for any retail broker. For crypto trading, Alpaca supports 24/7 execution on major pairs with spreads that are competitive with dedicated crypto exchanges.

• Free tier: IEX data (limited but sufficient for testing and learning).
• Paid tier: Full SIP data from all exchanges at $9/month for individuals.
• Execution: Fast fills on liquid names, standard retail slippage on small caps.
• Crypto: 24/7 trading on major pairs with competitive spreads.

Building AI Trading Strategies on Alpaca

Where Alpaca truly shines is as infrastructure for AI-driven trading strategies. You can feed market data into your machine learning models, generate signals, and execute trades through the API in a seamless pipeline. The paper trading environment lets you backtest strategies with real market conditions before risking capital. We built a simple momentum strategy using a gradient boosting model and had it running on paper trading within a day. The community is active on GitHub and Discord, with open-source examples ranging from simple moving average crossovers to sophisticated deep learning approaches. Before you get excited about backtest results, read our sober take on realistic expectations for algorithmic trading with AI — most retail strategies fail for predictable reasons.

Limitations and Who Should Look Elsewhere

Alpaca is not for everyone. If you do not write code, there is no graphical interface for placing trades manually, so traditional brokerages remain a better fit. Options trading is limited compared to platforms like Interactive Brokers. International markets are not supported yet; Alpaca focuses exclusively on US equities and crypto. The free market data tier is too limited for production strategies, so budget $9/month minimum for the SIP feed. And while commission-free trading is appealing, be aware that Alpaca earns revenue through payment for order flow, which means your orders may be routed to market makers rather than exchanges directly.