Kalshi's June Volume Hit $9.4bn — Its Best Month Ever — With Daily Trading Topping $1bn During the World Cup
Kalshi recorded $9.4 billion in trading volume in June 2026, up from $5.3 billion in May and the platform's highest monthly total ever. Total notional volume exceeded $31 billion, and daily activity consistently topped $1 billion during the World Cup. Canada vs. Morocco alone drew $48 million on Kalshi and $26.8 million on Polymarket.
Kalshi recorded $9.4 billion in trading volume in June 2026, up from $5.3 billion in May and the highest monthly total in the platform's history. Total notional volume exceeded $31 billion, and daily activity consistently surpassed $1 billion at the peak of World Cup activity. The numbers are the clearest evidence yet that the 2026 FIFA World Cup has functioned as a mainstream consumer breakthrough for US prediction markets, not merely a temporary volume spike.
The knockout rounds drove the biggest individual-match totals. Canada vs. Morocco drew over $48 million on Kalshi and $26.8 million on Polymarket — the largest single-match figure either platform has yet disclosed. US advancement markets generated millions in additional trades. The bracket-compression dynamic explains the acceleration: as the field narrows, each remaining match carries more outcome weight, casual group-stage bettors become active holders, and existing positions grow. Kalshi also announced a partnership with ADI Predictstreet during the tournament, strengthening its data and market infrastructure for World Cup contracts.
Polymarket reached approximately $4.3 billion in monthly volume in June, bringing the combined total across major US prediction platforms to an estimated $44.8 billion for the month — approaching the volume of mid-sized US commodities futures exchanges. For UK readers, that comparison is useful: UK-regulated exchanges cannot currently offer this product category, and the volume is accumulating entirely on the other side of the Atlantic.
One distinction worth noting as these figures circulate: trading volume and notional volume measure different things. Kalshi's $9.4 billion reflects contract transactions at traded prices; the $31 billion notional figure reflects total face value of all contracts, which is higher because event contracts typically settle at $1 and trade at fractional prices reflecting probability. Both are genuine measures, but they should not be compared directly against each other or against traditional betting handles, which are calculated differently. The sector is still developing common disclosure standards — worth remembering when any platform publishes headline volume numbers.
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