Polymarket World Cup Wagers Top $474 Million as Profits Cluster Among Few

Prediction markets let traders wager on real-world outcomes, making the 2026 FIFA World Cup a major test of the sector’s ability to attract mainstream users. Kalshi and Polymarket now account for more than 95% of the market, cementing a duopoly in which scale, consumer reach and marketing spending increasingly determine which platform converts attention into trading activity.

After the tournament concluded in July 2026, Kalshi reported $54.338 billion in total platform trading volume, 2.6 times Polymarket’s tally. Kalshi also led in app downloads and aggregate trading value, helped by heavy advertising spending. Polymarket continued to draw more website visits, but that traffic did not translate into a volume lead, leaving Kalshi ahead on the industry’s most closely watched commercial measures.

Polymarket allows traders to use crypto assets to wager on outcomes ranging from elections to economic events, with contract prices often treated as real-time measures of collective expectations. The decentralized prediction market relies heavily on transparent blockchain records and wallet activity to establish credibility, making signs of trading on nonpublic information or coordinated bets a significant test of market integrity and a potential focus for regulators.

A Bloomberg Businessweek analysis flagged about $200 million of Polymarket trading during the first half as potentially linked to insider activity. The top 1% of profitable accounts captured more than half of all gains, while over 50% of winning wallets were created within 24 hours before placing their bets. Some traders also appeared to split positions across multiple related wallets before withdrawing proceeds through Coinbase, intensifying scrutiny of the platform’s fairness.

Prediction markets allow users to trade event contracts tied to outcomes ranging from elections to sporting contests, putting platforms such as Polymarket and Kalshi in increasingly direct competition with traditional bookmakers. The 2026 World Cup has provided a major test of that model, concentrating global attention and trading demand while raising the stakes for licensed US betting operators and regulators overseeing the boundaries between derivatives and gambling.

Prediction-market activity during the 2026 World Cup reached the equivalent of 27% of total legal US sports betting volume, according to the latest data from H2 Gambling Capital. That was three times the 9% share recorded at the start of 2026, with the increase occurring within a month. The figures point to a rapid shift in wagering behavior, though the reports did not disclose an exact dollar value for the trading volume.

Prediction markets allow users to trade contracts tied to the outcomes of sporting, political and other events, with prices reflecting the market-implied probability of each result. Betting demand generated by the 2026 FIFA World Cup rapidly expanded Kalshi and Polymarket, bringing greater scrutiny to their liquidity, compliance and regulatory disputes across U.S. states.

Kalshi and Polymarket recorded a combined $44.8 billion in trading volume in June 2026, up 75% from May. Kalshi's monthly volume surged 87.4% to a platform record. Polymarket also returned to growth, supported by World Cup enthusiasm and U.S. market demand, though both companies continued to face regulatory challenges from several U.S. state governments.

Polymarket is a blockchain-settled prediction market where users can trade contracts on World Cup results. Bitget Wallet research shows that sports events are overtaking token trading and DeFi as a new gateway to crypto for mainstream users, reflecting the sector’s gradual expansion into the mass market.

Bitget Wallet found that about 60% of Polymarket’s World Cup bettors during the tournament in June 2026 were using a blockchain protocol for the first time. The related reports were compiled and published from June 14 to June 28. The research did not disclose total betting volume, but the share of new users underscored prediction markets’ ability to attract newcomers.

The 2026 FIFA World Cup is jointly hosted by the United States, Canada and Mexico and has expanded to 48 teams for the first time. Blockchain-based prediction market Polymarket allows users to trade on the probability of match outcomes. Its trading activity reflects the market's collective expectations and underscores the accelerating adoption of Web3 applications at major sporting events.

The World Cup formally kicked off on June 11, 2026, with host nation Mexico facing South Africa in the opening match. Cumulative trading volume for the game on Polymarket quickly exceeded $11 million, while live market odds put Mexico's probability of victory above 70%. Large amounts of onchain capital were concentrated on bets backing the host nation early in the match.

Polymarket and Kalshi allow users to wager through contracts on the outcomes of political, economic and other events, with contract prices also viewed as a crowd-based measure of probability. Although such prediction markets can aggregate information, retail participants face information gaps and competition from professional quantitative firms, raising questions about whether profits are distributed fairly.

A recent Wall Street Journal analysis of Polymarket and Kalshi data found that just 0.1% of professional accounts captured 67% of total profits, while more than 70% of Polymarket users lost money. The report did not disclose the data cutoff date, sample size or actual profit amounts, but the figures show that gains were highly concentrated.

Polymarket is an onchain prediction market built on Polygon where users trade on the outcomes of political, economic, technology and other events. The platform generates revenue from trading fees. Its revenue surge suggests prediction markets may become a sustainable crypto finance business rather than relying solely on election-driven interest, though regulatory pressure in the United States, Europe and Argentina remains a major risk.

On March 30, 2026, Polymarket expanded taker fees beyond crypto and sports to markets covering finance, politics, economics, culture, weather and technology. DeFiLlama data showed daily fees rising from about $363,000 to more than $1 million on both April 1 and April 2, putting the early annualized estimate at about $338 million. Fees totaled $7.1 million in the first week of the second quarter, accounting for 96.8% of all onchain prediction-market fees.

The World Baseball Classic, or WBC, is an international tournament sanctioned by the World Baseball Softball Confederation and led by Major League Baseball. As the 2026 tournament got underway at Tokyo Dome, decentralized prediction market Polymarket emerged as a new gauge of the competition. It allows crypto users to put money behind game outcomes, providing a real-time snapshot of the market’s collective view.

During the Tokyo leg of the 2026 WBC, Polymarket opened a market on Taiwan’s first game against Australia. The market at one point put Taiwan’s chances of winning at nearly 70%, with the probability continuing to fluctuate as wagers and pregame information came in. Reports also noted that early trading had favored Australia, underscoring that prediction-market probabilities are not definitive and adjust in real time to lineups, injuries and trading activity.