When the Seattle Seahawks take on the New England Patriots on Sunday, more than $2.6 billion in wagers will be on the line. A growing share — $800 million — will come through prediction markets like Kalshi and Polymarket that are transforming how sports betting works in the US.

On today’s Big Take podcast, professional sports gambler Rufus Peabody discusses why he has shifted more of his betting to prediction markets. And markets reporter Justina Lee  and sports business reporter Ira Boudway sit down with host David Gura to discuss why these markets are drawing pros like Peabody — and the concerns the platforms raise for regulators and traditional sportsbooks.

Read more: Gambling Pros Adjust to a Super Bowl on the Prediction Markets

Hosted by David Gura; Produced by Julia Press; Reported by Justina Lee and Ira Boudway; Edited by Jeffrey Grocott.

Fact-checking by Eleanor Harrison-Dengate; Engineering by Katie McMurran.

Senior Producer: Naomi Shavin; Deputy Executive Producer: Julia Weaver. Executive Producer: Nicole Beemsterboer.