Five Polymarket accounts have made it seem to be Trump will win the presidential election

Prediction markets like Polymarket and PredictIt also show Trump winning the election, but by a much steeper margin than some of the polls. As of Wednesday, Polymarket users have indicated Trump has nearly a 64% chance of winning the election, with Harris trailing at just 36%. PredictIt shows Trump in the lead with a 59% chance and Harris at 43%. 

But what’s important to remember about Polymarket is that it’s a cryptocurrency-based prediction market—and Americans aren’t even allowed to trade on the website. As a result, Polymarket is conducting checks to verify that major users on the platform are based outside of the U.S., a person familiar with the matter told Bloomberg. 

This could be a key element in cracking the code on why Trump is seemingly pulling so far ahead of Harris, especially since only a handful of Polymarket users appear to be swaying the election odds. Starting earlier this month, four Polymarket accounts started pouring millions of dollars worth of bets that Trump would win the election. 

As of Wednesday, Polymarket users Fredi9999, Theo4, PrincessCaro, and Michie had bet a collective $30 million that Trump would win the 2024 presidential election. Another Polymarket user, zxgngl, has been on a buying spree in recent days, betting more than $5 million worth of crypto on Trump retaking the Oval Office. With more than $35 million in bets being quickly poured into the presidential election market, it’s no wonder Trump appears to be ahead. 

Alex Marinier, a venture capitalist who was one of the first to invest in Polymarket’s seed round in 2020, told Fortune it’s entirely possible “some large whale is placing large bets that move the market.”

“They’re either super convinced that Trump would win, or explicitly to influence the market optics in favor of their candidate in an effort to help his odds of being elected,” Marinier said. “However, if the market believes that this whale bettor is, in fact, too optimistic on their candidate, then market forces should bring the market odds back to ‘correct’ market levels.”

Are prediction markets accurate at all?

Some political and betting experts have said prediction markets are the most accurate way to foresee election outcomes because people are betting real money on a particular outcome. The way prediction markets work is that traders buy shares depending on which outcome they think is more likely. Share prices or “odds” rise and fall depending on demand, so if the event happens the way the trader predicted, the contract or “bet” will rise to $1 and pay out—or fall to $0 if it does not.

“Political betting sites are the best at predicting the wisdom of the crowd,” Thomas Miller, a data scientist at Northwestern University, told Fortune’s Shawn Tully. Miller is known for his accurate calls for the 2020 election, and some of his methodology comes from examining prediction markets.

But other experts aren’t so sure, particularly since Polymarket allows only users to place bets using cryptocurrency—and U.S. voters aren’t even allowed to participate. 

“I could not disagree more with that thesis,” George Kailas, CEO of stock-market intelligence tool Prospero.ai, told Fortune. “People are spending money around what they want to happen, not some strong underlying logic or reason.” 

Plus, given that Polymarket is crypto-based and Trump is pro-crypto, “it would seem to be an indicator that Trump supporters are just more willing to bet on him than ‘wisdom,’” Kailas adds.

To be sure, Cliff Young, a pollster and president of public affairs for Ipsos, told Fortune betting markets are “about as good as the polls.” Although the “Presidential Election Winner 2024” market shows Trump with a great advantage over Harris, the “Popular Vote Winner 2024” shows Harris in the lead. Young said this could be because Trump appears to be stronger in the swing states.

While “Harris leads in the national race, which has leaned Democrat over the last few decades, the swing states define the election,” Young said.