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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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
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
TimescaleDB
Tiger Data (formerly Timescale) · Relational databases
PostgreSQL extension for time-series data adding hypertables, compression and continuous aggregates, from the company now named Tiger Data
Apache-2.0 AND LicenseRef-Timescale-LicenseOpen sourceFreeSelf-hostedNov 2, 2026
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