July Trading Volume on Kalshi and Polymarket Surged to Record Levels in July

TL;DR

• Kalshi, Polymarket and Polymarket US generated $50.59 billion in July volume, rising 7.8% from June and setting a monthly record for prediction markets.
• Kalshi led with $37.7 billion, while Polymarket fell 26% to $7.9 billion and its US platform climbed 54% to $5 billion during July.
• World Cup contracts drove billions in turnover, but open interest dropped to $1.2 billion as state regulators continued challenging sports-related prediction markets legally nationwide.

Kalshi, Polymarket, and Polymarket US generated $50.59 billion in combined trading volume during July, setting a new monthly record and rising 7.8% from June’s $46.95 billion. Prediction markets gained momentum as the FIFA World Cup concentrated attention on high-profile event contracts and pulled enormous sums into a sector still negotiating its legal identity. The record was not simply a broad market expansion, but a World Cup-driven surge distributed unevenly across three platforms throughout the month. The milestone confirms accelerating demand, yet the composition reveals traders were shifting where they participated, not merely increasing activity everywhere.

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