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About Double Rainbow
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.
How to play Double Rainbow
The first quarter of 2026 saw a total industry GGY of £4.4 billion including lotteries, or £3.4 billion excluding lotteries.
As of 31 March 2026, there were 2,154 licensed gambling operators, marking a 1.1% decline on the previous year. However the number of separately licensed gambling activities edged up 0.4% to 3,097.
The land-based gambling sector, comprising adult gaming centres (AGCs), betting shops, bingo halls and casinos, produced £4.9 billion in GGY over the year, marking a 1.1% yearly increase.
How to play Double Rainbow
Mexico is one of the NFL’s most important markets outside the United States and a core market for Codere Online.
It remained Codere Online’s largest market in Q2, generating €36.1 million in NGR, a 24% year-on-year rise. Chief Executive Aviv Sher said the company would continue investing as the market grows more competitive.
In an April interview with iGB, Sher reflected on the challenges of regulatory uncertainty in Mexico
