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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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Other retail sectors performed better. Bingo GGY increased 8.2% to £703.8 million ($941.8 million), while arcade GGY rose 10.7% to £800.1 million ($1.07 billion).

While the new figures underline the sheer scale of Britain’s regulated market, leading operator Entain is pressing the government for tougher action against black-market platforms.

Entain highlighted that 11 of 20 Premier League clubs currently hold sponsorship or advertising arrangements with gambling operators lacking a Gambling Commission license—up from government estimates of eight clubs during the 2025/26 season.

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“Trust is fundamental to the responsible adoption of AI. As its use becomes increasingly embedded across the gaming sector, organisations need practical ways to understand where AI is being used, manage the associated risks and ensure that accountability and human oversight remain firmly in place,” he said.

“The AI gaming charter translates these principles into practical, sector-specific guidance,” he added.

The charter also made a series of other recommendations. It suggested that companies should designate a senior member of staff responsible for governance of the technology. It additionally recommended an AI oversight or ethics committee.