Kalshi Offers $1 Billion Prize for Perfect March Madness Bracket

The challenge requires entrants to correctly pick all 63 games in the NCAA Division I Men's Basketball Tournament, something that has never been achieved. Even the company acknowledges the near impossibility of the task, stating on its website that those taking part “probably won’t win”. 

With 64 teams and a knockout format, there are an estimated 9.2 quintillion possible outcomes. Even for highly knowledgeable fans, the NCAA has previously estimated the chances of a perfect bracket at roughly one in 120 billion. 

“To put this into perspective, you are more likely to be struck by lightning than create the perfect bracket. Your odds are roughly equivalent to searching for one grain of sand from all of Earth’s beaches and deserts…and getting it right on the first try,” Kalshi said in a statement.  

Despite those long odds, millions of fans fill out brackets every year, making it one of the most popular traditions in US sports and at the best sports betting sites. The American Gaming Association estimates that more than $3.3 billion will be wagered on men’s and women’s college basketball during the tournament. 

Kalshi said that if no one achieves a perfect bracket, it will award $1 million to the closest entry, with an additional $1 million split between two education-focused nonprofits, iMentor and Starting Five, the charity of NBA All-Star Devin Booker.  

College basketball drives record activity on Kalshi

The surge in interest around March Madness is already reflected in trading activity. Kalshi reported that men’s college basketball was its most heavily traded sport in February, with $2.27 billion in volume, surpassing both the NFL and NBA during the same period. 

The growth of trading on prediction market apps has also led to increased scrutiny from the NCAA, which has complained about the use of its trademarks. It has asked Kalshi to remove references to March Madness from its site, arguing that the term implies an official affiliation. 

The NCAA has taken similar steps in the past, including requesting the removal of language suggesting that event outcomes were verified by the organization. Kalshi has complied with some of those requests, but tensions remain. 

The issue extends beyond branding. The NCAA also bans athletes, coaches, and staff from being involved in sports betting or prediction markets. 

But some pro leagues, including the NHL and MLS, have already signed up with prediction market platforms, while others remain cautious. Meanwhile, big-name athletes like Giannis Antetokounmpo and Bryson DeChambeau have signed endorsement deals with prediction market companies, highlighting their increasing visibility in sports.