Prediction Markets Post $50.6B July Record as Supreme Court Countdown Begins

§ 01 Executive Snapshot

• What: Prediction markets reached a record trading volume in July, totaling $50.59 billion.
• Who: Key players include Kalshi, Polymarket, and Polymarket US.
• Why it matters: The record volume coincides with significant regulatory challenges, including a major lawsuit against Kalshi, highlighting the precarious nature of the prediction market landscape.

§ 02 Key Developments

• Kalshi achieved $37.7 billion in volume for July, a 14% increase from June, claiming approximately 74.5% of the total market volume.
• Polymarket's international exchange volume dropped 26% to $7.9 billion, while Polymarket US rose 54% to $5 billion following the removal of its waitlist.
• Open interest across Kalshi and Polymarket fell from $2 billion to $1.2 billion during July, marking a 40% decline.

§ 03 Strategic Context

• The record volume was primarily driven by the 2026 FIFA World Cup, underscoring the event-driven nature of prediction markets.
• The ongoing legal battles, particularly the implications of the Murphy v. NCAA ruling, frame the future of prediction markets against a backdrop of federal versus state regulatory authority.

§ 04 Strategic Implications

• Immediate implications include Kalshi's dominance in the market, suggesting a trend towards centralized platforms amidst regulatory scrutiny.
• Long-term, the legal outcomes regarding prediction markets could redefine the regulatory landscape, impacting user engagement and operational models.

§ 05 Risks & Constraints

• Regulatory risks are significant, particularly with New York's $36 billion lawsuit against Kalshi, which could set precedents affecting market operations.
• Competition from emerging platforms and the volatility of user engagement between major events pose ongoing challenges to sustaining active trading volumes.

§ 06 Watchlist / Forward Signals

• The upcoming November 3 midterms are expected to be the next major event that could drive trading volume and user engagement on these platforms.
• The outcome of New Jersey's petition to the U.S. Supreme Court could have profound implications for the future regulatory framework governing prediction markets.