Tramp Day

How to play Tramp Day

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.”

What is Tramp Day?

Santos is not the only individual disciplined for trying to game the prediction market system. Ben Midgley, a Republican candidate for the governorship of Maine, admitted purchasing under $1,000 worth of contracts related to his campaign. He accepted a $5,434.30 fine and a three-year suspension.

Meanwhile, Laurie Buckhout, a candidate for a North Carolina congressional seat, was fined $2,589.96 and suspended for three years after buying under $1,000 of contracts linked to her race.

Also, Stephen Cloobeck, a billionaire and 2026 California gubernatorial candidate, purchased approximately $10,000 in contracts tied to his campaign. He was fined $31,770 and suspended for three years.

About Tramp Day

On Monday, the Department for Digital, Culture, Media and Sport (DCMS) announced that Ruth Evans has succeeded Charles Counsell to take on the full time role of Gambling Commission chair.

Counsell took the helm in February 2025 following Marcus Boyle’s departure in January last year.

Evans, who chairs Stop Scams UK, an initiative she founded in 2019 to unite banks, technology companies and telecom providers to combat payment fraud, will assume the position on 30 September, commencing a five-year term.