Alpaca is an API platform offering commission-free trading for stocks, options, and cryptocurrencies. It provides a suite of APIs—including Trading API, Broker API, and Market Data API—designed for fintech startups, algorithmic traders, and financial institutions to build and scale trading applications. Alpaca supports over 20 cryptocurrencies across 56 trading pairs, available 24/7, with secure custody solutions and real-time market data. Its infrastructure emphasizes low-latency order processing and scalability, making it suitable for a wide range of trading strategies and applications.