Polygon.io is a financial technology company that provides real-time and historical stock market data to developers and investors. The company's APIs allow users to access data on stocks, options, and cryptocurrencies, as well as news and social media sentiment analysis. Polygon.io was founded in 2017 by Mat Sposta and is headquartered in Boston, Massachusetts. The company's clients include hedge funds, banks, and trading firms, as well as individual investors and developers.