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Kalshi posts record $60.7B September; Polymarket US hits $8.8B September record
- Kalshi posts record $60.7B September; Polymarket US hits $8.8B September record — Kalshi held $2.5 billion in open interest on October 7 after September became its biggest month ever with $60.7 billion in trading, while Polymarket US set its own September record at $8.8 billion. Pew data shows Polymarket's political markets run far deeper, with $1.3 billion in political volume in June against $261 million on Kalshi. (Datawallet)
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