Finnhub

Real-time and historical market data API with WebSocket streaming, fundamentals, and SEC filings — a free starting point for trading agents.

by FinnhubListed August 4, 2026

Finnhub provides real-time US stock quotes across major exchanges, with a WebSocket feed offering tick data for up to 50 symbols in the free tier. The REST API adds historical data, company fundamentals, SEC filings, earnings calendars, insider transactions, ESG scores, and sentiment across 60+ global exchanges.

Its generous free tier and simple API make Finnhub a common data source for prototyping agentic and ML trading strategies before scaling to paid feeds. It is a market-data layer for signal generation and analysis, not an execution engine.

Tagged with

research market-data

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