The election-betting market has exploded in popularity this presidential cycle

• Betting markets are booming ahead of the US Presidential election.
• Kalshi has attracted $100M in election bets this month and is the top free finance app in Apple's app store.
• Robinhood is getting in on the action, announcing its own election betting platform on Monday.

Betting markets are having a moment in the 2024 presidential election cycle.

The popularity of platforms that allow users to wager on politics has exploded, with sites like Polymarket and Kalshi allowing users to place bets on specific election outcomes. Robinhood is the latest platform to get in on the action, with the popular brokerage app announcing the launch of its own election betting contracts on Monday.

Earlier this month, a US federal appeals court cleared Kalshi to open its election betting platform for US citizens. Since then, the platform has attracted more than $100 million in bets related to who will win the election on November 5.

Kalshi has rocketed in popularity on the Apple App Store, sitting at #7 on Tuesday morning. Among free finance apps, Kalshi is the top download, eclipsing Cash App, PayPal, and Venmo.

"I think we're gunning for number one for the entire app store by election day, so the demand curve truly is exponential," Kalshi CEO Tarek Mansour told CNBC on Monday.

Meanwhile, Polymarket, which is not available to US citizens, has seen an explosion in trading volume this year.

According to data from The Block, nearly $2 billion has been wagered on Polymarket's website in October, about quadruple the $533 million wagered in September and more than 10 times the $39 million wagered in April.

Before 2024, the monthly trading volume on Polymarket was typically less than $20 million.

While Polymarket isn't available to US users, it's attracted a lot of attention and shaped the discussion of these betting platforms in US media in the final stretch of the election cycle. That's because the odds of the election outcome on the platform highly favor Donald Trump, in stark contrast with the polls, which are extremely close one week from the vote.

There's also been scrutiny of the betting itself on the platform. Some of Polymarket's trading volume this month has come from a massive "whale" trader that has bet more than $30 million on the outcome of the US election, at times placing as many as 71 bets per minute. The bets have been mainly for Donald Trump to win the presidential election.

Interactive Brokers also launched a slew of election betting contracts earlier this month following the court decision to allow Kalshi to operate.

Between the rapid legalization of sports betting, the continued popularity of crypto trading, and now the sudden spike of interest around election odds, there's a clear convergence of ways for the average person to make — and in many cases, lose — money through a few clicks on their phone. It's a situation where everyday hobbies are becoming financialized.

According to Mansour, the CEO of Kalshi, the boom in betting markets is a good thing because it allows for a new arbiter of truth based on money.

"Now when you're asking a question of will TikTok get banned? Who are we relying on to get that answer? Now there is a market-based mechanism to look to," Mansour said.

Kalshi's mission is to bring "more truth to the world through the power of markets," a job posting on its website said.