Polymarket and Kalshi’s cumulative trading volume reaches $150 billion: $21.9 billion in April alone sets a new all-time high

Crypto prediction market leaders Polymarket and Kalshi together reached a historic cumulative trading volume in April 2026, crossing the $150 billion level. The two platforms collectively surpassed this threshold, marking a turning point in the shift of prediction markets from niche trading products to mainstream financial markets. In April alone, Kalshi saw about $13.4 billion in volume (52% market share), while Polymarket recorded about $8.5 billion (33% market share); together they accounted for 85% of the industry.

Cumulative vs. monthly: Kalshi leads, Polymarket follows closely

Looking at cumulative (lifetime) scale: since launch, the two platforms combined have reached $150 billion in total trading volume. From YTD (from the start of the year to 4/20): Kalshi is about $37.49 billion, Polymarket about $29.23 billion; together, $66.7 billion. From April alone (single-month): Kalshi $13.4 billion, Polymarket $8.5 billion, for a combined $21.9 billion—also the highest single-month scale for 2026 to date.

The combined weekly trading volume for the week that includes April 20 was about $5.9 billion, reflecting heightened trading demand driven by events including statements that the Trump war had ended, a draft Iran peace agreement, and the Polymarket × Chainalysis collaboration. After Polymarket signed a Chainalysis anti–insider trading agreement on 4/30, market expectations for deeper compliance rose, which could further boost Q2 institutional participation.

Structural reasons Kalshi leads Polymarket

Kalshi’s gap—maintaining a 52% market share in April, exceeding Polymarket’s 33%—has held for several months. Behind this are three structural differences: first, Kalshi obtained full CFTC regulatory approval early on, allowing it to serve users in the United States; second, after Polymarket’s 2022 settlement, it has remained barred from accessing U.S. users (though it is currently negotiating with the CFTC to lift the ban); third, Kalshi’s betting interface is closer to the traditional sports betting experience, with a lower entry barrier.

That said, Polymarket’s differentiating value lies in: openness to international users, crypto-native settlement (USDC), and broader topics (including global geopolitics and crypto derivative events). This still gives it a unique appeal for pure crypto users and quantitative traders. The Senate’s full passage on 4/30 of S. Res. 708 banning senators from trading on both platforms is precisely because both platforms have already gained “market representativeness” status in political public opinion.

What to watch next: Polymarket CFTC clearance talks, Kalshi valuation trends

The next focal point is progress in Polymarket’s negotiations with the CFTC—if approval is granted, Polymarket would directly open the U.S. user market and could quickly narrow the market-share gap with Kalshi. Another key issue is whether Polymarket’s ongoing $400 million fundraising (a $15 billion valuation) can be completed as planned; Kalshi’s latest valuation is about $22 billion, staying ahead of Polymarket. This month is also Kentucky Derby week, held on Saturday, but neither platform has opened betting for this event, reflecting that both still maintain a risk-avoidance stance in the sports betting domain.

This article Polymarket, Kalshi cumulative trading volume reaches $150 billion: April’s single-month $21.9 billion sets a record first appeared on Lian News ABMedia.