Prediction markets hit a record $50.59 billion in combined volume in July 2026, with Kalshi accounting for approximately 74.5% of that total. On identical questions, the two leading venues show significant gaps: « Blue tsunami in 2026? » was priced at 44.5% on Polymarket versus 36.0% on Kalshi, and « Blue wave in 2026? » at 82.5% versus 74.0%, both an 8.5-point difference. Across comparable binary markets, the median gap exceeds four points, with nearly half differing by five or more points. Predictions.io now tracks over 9,700 markets across Kalshi, Polymarket and Manifold, and offers two free tools: a Fee Calculator and an Odds Converter. Regulatory scrutiny is intensifying, with New York City opening a probe into both venues and a Washington judge ordering Kalshi to halt most wagers in the state.
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