SiftingIO

SiftingIO is a multi-asset market data API that provides real-time and historical data for US stocks, forex, crypto, and commodities, along with DEX and on-chain data. Developers can retrieve snapshots, historical prices, and OHLCV bars over REST, or stream live quotes and trades over WebSocket. Data from multiple venues and sources is aggregated, de-duplicated, and normalized into a consistent JSON schema. The same API key and authentication model work across supported markets, with consistent field naming and response structures. Built by market-data engineers with over a decade of experience, SiftingIO offers a free tier, SDKs for Go, Python, and JavaScript, and a 99.9% uptime SLA on eligible plans.