Alpaca is an API-first brokerage and market-data platform for developers building stock, options, and crypto trading applications. It provides paper trading, commission-free...
Pros
- Purpose-built trading API with REST, WebSocket, and SDK support
- Paper-trading environment is included for testing strategies
- Commission-free U.S. stock and ETF trading
Cons
- Fewer global markets and asset classes than Interactive Brokers
- Production access and account approval can involve eligibility restrictions
- Advanced order types and broker tools are less extensive than TradeStation
Free API; commission-free stocks and ETFs; paid market-data tiers