The Google Finance API, despite its association with the Google brand, has become outdated and unreliable due to a lack of maintenance and sparse documentation. As a result, developers seeking financial data for programmatic trading and stock market tracking have turned to alternative APIs. Notable replacements include the Yahoo Finance API, which offers extensive stock market data and a freemium pricing model, and Alphavantage, known for its comprehensive data options and regular maintenance. Other alternatives include Currencylayer for real-time currency updates, Investors Exchange (IEX) for rapid data requests, and Tradier for integrated trading and data tracking. Each alternative offers unique features catering to different developer needs, such as extensive free public endpoints, high usage limits, and support for various programming languages.