Online prediction markets, despite previous prohibitions in the US, are now taking billions in bets on the 2024 presidential election, attracting significant attention from traders and raising questions about their reliability compared to traditional polls. The Commodity Futures Trading Commission (CFTC) fined Polymarket $1.4 million in January 2022 and issued a cease and desist, but the platform, which processes over $2 billion in bets and counts Elon Musk among its supporters, remains accessible to US users via private networks. Rostin Behnam, Chairman of the CFTC, acknowledged the agency's "responsibilities of being an election cop" given the influx of wagers.

Kalshi, a US-legal prediction market, reported general election bets hitting $30 million within its first three weeks and surging to $139 million. While Kalshi can handle wagers up to $100 million, concerns about market manipulation persist. For instance, one trader reportedly put $45 million on Trump on Polymarket since September, which is a considerable sum even within a $2 billion market. Nate Silver, a consultant for Polymarket, advises caution regarding current market data, suggesting that it may not be very accurate at this stage due to a lack of historical election data.

Experts like Adam Cochran, founder of Hain Ventures, worry that the public might misinterpret these markets, which reflect the "odds of an event happening" rather than a precise margin of victory or a poll's intended outcome. Though prediction markets offer valuable insights by incentivizing bettors with "skin in the game" to provide accurate forecasts, critics express concern regarding potential manipulation, especially with billions of dollars on the line. The current election cycle is seen as a significant test for these markets, and their performance at this scale is under scrutiny.