```html StockLens - Historical Data

Historical Data Sources

Access multiple data sources for comprehensive historical stock data beyond one year

Select Data Source

Required for Polygon.io, Alpha Vantage, and IEX Cloud sources

Available Data Sources

Polygon.io

Professional-grade financial data API with real-time and historical market data.

Coverage: Stocks, Options, Forex, Crypto
History: Up to 20+ years

Yahoo Finance

Free financial data source with extensive historical data for most publicly traded companies.

Coverage: Stocks, ETFs, Indices
History: Up to full history

Alpha Vantage

Free API with historical and real-time data for global equities, forex, and cryptocurrencies.

Coverage: Global Stocks, Forex, Crypto
History: 20+ years for US stocks

IEX Cloud

Financial data platform with real-time and historical data for US equities and market data.