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The investment banking and capital markets firm Jefferies said in a September report that sports had become prediction markets’ “most important liquidity driver”, with combo and parlay-style contracts accounting for an increasing share of activity. But the analysts cautioned that prediction markets are scale businesses with relatively low revenue yields, leaving their economics dependent on sustained liquidity, engagement and trading activity.

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.

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Former US congressman George Santos has been permanently prohibited from trading on the prediction market Kalshi, the company announced late last week. 

Friday’s announcement followed an investigation that found he manipulated contract prices linked to his anticipated attendance at the 2026 State of the Union address.

He was also fined $71,356.

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“But after yesterday’s game, they’re going to draw a lot more support because they were pretty good underdogs (against the Chargers),” Scucci added.

Bettors had plenty of momentum after favorites dominated Week 1, but Sunday (Sept. 20) tilted back in the sportsbooks’ favor behind a wave of upsets. Several heavily backed teams failed to win or cover the spread.

The biggest wins for Boyd were the Eagles failing to cover (24-20 over the Titans), the Saints winning outright as large underdogs (24-17 over the Ravens), and the Browns topping the Bucs (23-19). For bettors looking to recoup losses, the afternoon slate offered relief, with the 49ers handling the Dolphins (35-13), the Seahawks routing the Cardinals (31-7), and the Cowboys topping the Commanders (37-20).
Sky Sports