Prediction Market Traders Push April 2026 Volume to $8.6B, Kalshi Takes the Lead
Key Takeaways: Open interest across the sector stood at $1.11 billion as of May 1, 2026. Kalshi held $630.7 million of that total while Polymarket carried $449.9 million. Predict.fun, Opinion, and Limitless each held well under $15 million in open positions. Monthly fees generated across the sector reached $31.15 million in April. Polymarket collected $29.22 million of that total, a figure based on resolution price and mergeable amounts. Limitless followed at $1.51 million, with Predict and Opinion generating $260,000 and $154,000 respectively. The fee figures indicate that Polymarket, despite trailing Kalshi in taker volume, continues to extract a disproportionate share of sector revenue. Its traders appear to place higher-value contracts on average, a pattern consistent with its global user base and deep liquidity on high-profile markets. April’s numbers extend a growth trend that began accelerating in late 2024. Total monthly taker volume sat below $500 million as recently as mid-2024, meaning the sector has grown more than 17-fold in under two years. Kalshi and Polymarket now control an estimated 85% to 95% of total prediction market industry volume, with academic platforms like PredictIt and the Iowa Electronic Markets operating at a fraction of that scale.Sector Revenue
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