Kalshi's June Volume Hit $9.4B — Its Best Month Ever — With Daily Trading Topping $1B 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, the largest single-match figure yet.
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 — the face value of all contracts traded, reflecting turnover rather than new capital deployed — exceeded $31 billion, and daily activity consistently surpassed $1 billion at the peak of World Cup activity. The numbers represent the clearest evidence yet that the 2026 FIFA World Cup has functioned as a mainstream consumer breakthrough for US prediction markets, not just a volume spike that returns to baseline when the tournament ends.
The knockout rounds drove the biggest individual-match numbers. Canada vs. Morocco, played in the Round of 16, drew over $48 million in trading volume on Kalshi and $26.8 million on Polymarket — the largest single-match figure the platforms have yet disclosed. US advancement markets generated millions in additional trades as the host nation progressed. The pattern follows a familiar bracket-compression dynamic: as the field narrows, each remaining match carries more outcome weight, more traders take positions, and existing holders add to them. The Round of 16 is where the casual World Cup bettor — the user who opened an account for the group stage and won a few contracts — turns into an active trader holding positions into the quarterfinals.
Kalshi also announced a partnership with ADI Predictstreet ahead of and during the tournament, strengthening the platform's 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 — a figure that includes volume on both regulated US exchanges and Polymarket's international platform. To put the scale in context: $44.8 billion in monthly volume approaches the territory of mid-sized US commodities futures exchanges, from a sector that did not meaningfully exist at the retail level in the United States before 2024.
One distinction worth holding onto as these numbers circulate: trading volume and notional volume measure different things. Kalshi's $9.4 billion in trading volume reflects the sum of all contract transactions at their traded prices. The $31 billion notional figure reflects the total face value of all contracts, which is a higher number because event contracts typically settle at $1 and are traded at fractional prices reflecting probability. Both are real measures; neither is inflated, but they should not be compared directly against each other or against figures from traditional betting handles, which are calculated differently. The sector is still developing common disclosure standards. What the June data does confirm unambiguously: the volume trajectory that began when the World Cup opened on June 11 did not plateau — the knockout rounds accelerated it.
Operators mentioned in this article
Recent updates
Crypto.com and Novig Sue Missouri as Market Leaders Hold Back — Eighth Circuit Now in Play via Iowa
Crypto.com and Novig filed federal lawsuits on October 16 challenging Missouri's cease-and-desist orders, arguing their sports event contracts fall under exclusive CFTC jurisdiction. The suits came as Missouri's 30-day compliance window closed. Notably, the market leaders — Kalshi, Polymarket, Robinhood, and Underdog — have not sued; Missouri said it is in 'ongoing discussions' with Kalshi. The outcome is tied to the Eighth Circuit, which is now weighing the same preemption question in Kalshi's appeal of a preliminary injunction denial in Iowa — the fourth federal circuit to take up the prediction market question.
Ohio Escalates Post-Sixth Circuit — Cease-and-Desist to 10 Operators, but Platforms Keep Operating
Emboldened by its Sixth Circuit win, Ohio escalated enforcement against prediction markets. Governor Mike DeWine and the Ohio Casino Control Commission issued cease-and-desist letters dated October 2 to 10 operators, including Polymarket and Robinhood, with an October 16 compliance deadline and penalties up to the value gained from contracts. Kalshi was excluded because a court order already covers it. As of October 20, platforms were continuing to operate in Ohio despite the deadline passing. Polymarket has sued the Commission and Ohio AG Andy Wilson on Commerce Clause and CEA-preemption grounds; Wilson is expected to sue non-compliant operators.
Midterm Election Betting Tops $220M — Double the Entire 2024 Cycle — as Public Opposition Mounts
Traders have wagered more than $220 million on the 2026 congressional midterms across Kalshi and Polymarket, more than double the $92 million bet across the entire 2024 cycle, according to a Reuters analysis of Anti-Corruption Data Collective data published October 14. The 2026 cycle has more than 21,000 individual markets, up from 463 tracked in 2024. Volume is concentrated in a few races, led by the Texas Senate contest. The growth comes despite a Reuters/Ipsos poll finding that most Americans oppose using prediction markets to bet on elections, and amid continuing concern from election officials about integrity and insider trading.