Alpaca
Alpaca (AlpacaDB, Inc.) · Financial analysis & investing
API-first US brokerage offering a Trading API, Market Data API and Broker API for stocks, ETFs, options and crypto, with paper trading
Apache-2.0FreemiumUsage-basedNov 2, 2026
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Interactive Brokers API
Interactive Brokers LLC · Financial analysis & investing
Programmatic trading and market-data access to Interactive Brokers accounts through the TWS API, the REST-based Web API and FIX
ProprietaryUsage-basedPaidLocalRedirected
Kraken API
Payward, Inc. (Kraken) · Financial analysis & investing
REST, WebSocket and FIX interfaces to the Kraken cryptocurrency exchange for market data, spot and derivatives trading and account management
ProprietaryFreeUsage-basedNov 2, 2026
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