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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Bloomberg Terminal
Bloomberg L.P. (FIGI Registration Authority) · Market & fundamentals data
Bloomberg's subscription workstation for market data, news, analytics, messaging and execution, with Excel integration and the BLPAPI library for C++, Java, .NET and Python
ProprietaryPaidEnterpriseLocalNov 2, 2026
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
QuantConnect
QuantConnect Corporation · Financial analysis & investing
Algorithmic trading platform built on the open-source LEAN engine, with cloud backtesting, research notebooks and brokerage-connected live trading
Apache-2.0FreemiumPaidLocalNov 2, 2026
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