There are several APIs that offer free stock market data. Here are a few popular ones:
- Alpha Vantage: Alpha Vantage provides a free tier that allows you to access stock market data, including real-time and historical prices, technical indicators, and more. They also offer a variety of other financial data.
- Yahoo Finance API: Yahoo Finance offers a free API that provides access to a wide range of financial data, including stock prices, historical data, company information, and more.
- IEX Cloud: IEX Cloud offers a free tier that provides access to real-time and historical stock market data, company fundamentals, and other financial information.
- Polygon: Polygon (formerly known as Alpaca) offers a free tier that provides access to real-time stock market data, including stock prices and quotes.
- Financial Modeling Prep: Financial Modeling Prep offers a free API that provides access to historical stock prices, financial statements, company profiles, and more.
- Quandl: Quandl offers a freemium model, with some free data available. They provide a wide range of financial and alternative data, including stock prices, futures, options, and economic indicators.