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Real-time and historical market data API
Polygon.io is a market data API platform providing real-time and historical data for stocks, options, forex, and cryptocurrencies. Founded in 2017, Polygon.io has built a developer-first market data platform with clean REST and WebSocket APIs, comprehensive documentation, and competitive pricing. The Stocks API provides real-time quotes, trades, aggregates (bars), and snapshots across all US equities. Historical data goes back decades for equity markets. Options data covers the complete US options market with Greeks calculation. Forex data covers all major and minor currency pairs with real-time rates. Crypto data aggregates from multiple exchanges for a comprehensive view. WebSocket streaming delivers real-time market data with sub-second latency. Polygon's Snapshot API provides a complete market state for all tickers at once—useful for scanning and screening applications. Company details, financials, dividends, and splits are available through the Reference API. The free tier provides historical data access, while paid tiers unlock real-time data and higher rate limits. Polygon's pricing is transparent and developer-friendly, with plans scaling from hobby projects to production applications. SDKs for Python, JavaScript, Go, Java, and other languages simplify integration. Polygon is particularly popular with quantitative analysts, algorithmic traders, and fintech developers who need reliable, affordable market data. Its API design and documentation quality receive consistently high marks from developers.