Fang City

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James Monk, founder of sports data and streaming provider Catalist Sports, has witnessed that dependence directly. Catalist supplies ITF tennis data to Kalshi and Polymarket and has an exclusive US sports-streaming agreement with Kalshi.

The company must also provide data to the firms making markets on those events.

“If we just sold the data to Kalshi in order to list the markets but no one was coming in and placing liquidity, there’s no point in them listing the markets,” Monk said. “We also need to supply the data to the market makers to inform their models.”

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The arrests come amid a surge in burglaries targeting Illinois’ vast network of nearly 50,000 video gaming terminals.

Illinois Gaming Board data obtained earlier this year by the Chicago Sun-Times revealed that 502 gaming-related burglaries had been reported through June 22—already topping the 473 recorded during all of 2025. More than $1.5 million was stolen during the first half of 2026 across more than 100 municipalities.

The attacks have shown little sign of slowing. Earlier this month, law enforcement noted that a single crew is suspected in coordinated burglaries across Wheeling, New Lenox, and Peotone, where masked offenders armed with sledgehammers hit gaming venues within a 24-hour span.

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One of its investigations concerns a specific globally renowned brand. Madsen says an initial scan identified around 1,600 domains, followed by another roughly 4,500 associated with this operator. That puts the number identified so far at around 6,000, although he believes the actual figure is considerably higher. “I think what we’ve found so far is only a small part of the overall picture,” he says. “I’m almost certain the real number is at least twice as high.”

Euromat’s report has suggested that a core group of 25 offshore operators are generating up to 64% of European traffic to the black market.

Madsen says investigators can also examine how sites appear from different jurisdictions. If a site is presented in a country’s local language, for example, that can indicate that the market is being targeted. The next question is whether the operator has the necessary licence.