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
Massive (formerly Polygon.io)
Massive (Polygon.io, Inc.) · Market & fundamentals data
Market data platform (renamed from Polygon.io in October 2025) with REST and WebSocket APIs, flat files and SQL access for US stocks, options, indices, forex, crypto and futures
ProprietaryPaidEnterpriseNov 2, 2026
Nasdaq Data Link
Nasdaq, Inc. · Market & fundamentals data
Nasdaq's marketplace for financial, economic and alternative datasets (formerly Quandl) with a REST API, time-series and table endpoints and Python, R and Excel clients
ProprietaryFreemiumPaidNov 2, 2026
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