Massive

A financial market data API providing real-time and historical data for stocks, options, indices, currencies, and futures. It solves the problem of accessing institutional-grade market data by offering standardized JSON/CSV formats, client libraries, and multiple access methods. The target audience includes developers, traders, and fintech startups, from individual builders to large enterprises. It is positioned as a direct-from-source provider with co-located infrastructure, ensuring low latency and reliability, and offers a free tier.

Key features

• Real-time and historical data
• Stocks, options, indices, currencies, futures
• JSON and CSV formats
• Client libraries for Python, JavaScript, Go, Java
• REST and WebSocket APIs
• Flat file downloads via S3
• SQL query access
• Direct exchange connectivity
• Free tier available