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Kwery vs Polygon.io
Polygon.io is a popular market data API for US equities, forex, and crypto. Kwery focuses on prediction markets (Polymarket, Kalshi), Binance spot and perps, Hyperliquid, and Chainlink with a single normalized schema. If you need Polymarket historical data, Kalshi API data, or prediction market order books, Kwery is built for that.
Kwery
Polygon.io
Polymarket & Kalshi order book and OHLCV
US equities, forex, crypto; no Polymarket/Kalshi
Snapshot-at-timestamp, full depth order book
Equity and crypto bars and quotes
Binance funding, OI, liquidations in same API
Separate products for different asset classes
One schema across prediction + CEX + oracle
Multiple APIs and schemas
Free tier: 150K credits, 14 days history
Free tier varies by product
Choose Kwery when you need prediction market data (Polymarket, Kalshi), Binance liquidations, or a single API for prediction + CEX + oracle. Choose Polygon.io for broad US equity and forex coverage.