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Two operators alone – Kalshi and Polymarket – topped the combined $1 billion mark in NFL trading activity over the first six days of Week 1, according to numerous measures this week. During the period, Kalshi recorded NFL volume of $983.4 million, according to DeFi Rate, earning the pole position by a large margin. Mahomes and the Kansas City Chiefs thrashed the Denver Broncos 31-10 on Monday Night Football, capping the largest week for prediction markets ever.
Even before the primetime matchup in Kansas City, it became abundantly clear that the industry would shatter previous marks for weekly activity. The AFC West showdown bolstered the already robust totals. Overall, volume for the week hit a record $15.9 billion, according to Bank of America, up 16% from a week earlier.
The pure-play prediction market-operators, Polymarket and Kalshi, emerged from Week 1 as the clear winners. On one hand, Kalshi’s market share lead narrowed over its competitors, falling to 82% for the week ended 13 September, down from 86% a week earlier.
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Safeguarding has reappeared as a focal point for the regulator. In July of this year, ANJ imposed a €500,000 ($572,797) fine on an unnamed online betting operator, referred to as Company X, for not adequately identifying and supporting customers exhibiting signs of problematic gambling.
The fine followed an investigation that found Company X had failed to correctly identify 29 high-risk players at an appropriate risk level. Six players were missed entirely and 23 were misclassified at a lower risk tier.
The regulator also launched a public awareness campaign earlier this year during the 2026 World Cup to warn of potential gambling addiction risks associated with increased sports betting during the tournament.
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More than a year after then-Houston Astros pitcher Lance McCullers faced menacing threats from an exasperated bettor, questions remain about whether the proposed bans will serve as a meaningful deterrent to agitated sportsbook customers. An investigation later determined that the bettor resided overseas.
Since the Supreme Court’s PASPA decision in 2018, there has been an uptick on harassment against athletes from bettors. The collection of incidents, in the view of the industry, is typically construed as both troubling and prevalent. Against a backdrop of alarming threats in numerous sports, perhaps the most disconcerting occurred at the hands of Benjamin “Parlay” Patz, a California bettor.
Approximately 15 months after the high court’s ruling, Patz sent a series of explicit messages to four members of MLB’s Tampa Bay Rays, threatening to “sever” their necks open. Accused by federal investigators of targeting more than 300 accounts of pro and college athletes, Patz pleaded guilty in 2021 to transmitting threats in interstate or foreign commerce. Although a judge ordered Patz to undergo mental health treatment and abstain from gambling, he did not sentence the bettor to prison.
