Late-night raid! The FBI breaks in and raids homes in a final showdown between two prediction-market billionaire contenders: who is controlling your wins and losses?

You scroll through your phone, watching the odds in the prediction market shift for Trump and Harris. You think it’s the product of collective intelligence. But what you don’t see is that behind this game, two young men are shooting it out with hunting rifles.

One morning in November 2024, Polymarket founder Shayne Coplan was still asleep in his New York apartment when he suddenly heard a loud crash as the door was breached. FBI agents entered with hammers, rummaging through the place in search of evidence of “illegal betting.” Coplan publicly denounced it as political pressure from the Biden administration, but privately, his team had already zeroed in on the real mastermind behind the scenes—the CEO of Kalshi, its biggest rival, Tarek Mansour.

Four people with knowledge of the matter said that months before the search, Kalshi’s lawyers had quietly walked into the Manhattan federal prosecutors’ office. They explained Polymarket’s operating model in detail, highlighting a fatal flaw: the platform supposedly banned U.S. users, yet everyone could access it. That tip was never made public.

This isn’t simple commercial competition. Twenty-eight-year-old Coplan and thirty-year-old Mansour—both newly minted billionaires—can’t stand each other. Their feud has seeped into every business deal, every meeting, and even influenced the direction of regulation in Washington. Dustin Gouker, an analyst who has tracked prediction markets for a long time, said bluntly: “The resentment between them runs too deep—early on, it’s already mixed with personal grudges.”

The two companies fight over trademarks, scramble for the same business partnership, poach each other’s talent, and launch direct personal attacks on social media. More ironically, both of them have built business partnerships with little Donald Trump—an all-too-common Washington PR playbook during Trump’s time in office. Former Kalshi employee and prediction-market fund manager Noah Zingler-Sternig said: “A lot of things have crossed the line, and that makes it hard for the public to take these two platforms seriously.”

The core disagreement comes down to compliance red lines. Kalshi insists on getting U.S. regulatory licenses first before launching domestic business, strictly enforcing real-name verification, and blocking sensitive bet categories. Polymarket, by contrast, operates from offshore: users don’t need to submit personal information to register, and they can even bet on events like the timing of an Israeli missile strike.

Mansour graduated from MIT and calls himself a math enthusiast. He once used the “friendly rivalry” between Tom Brady and Eli Manning as an analogy for the relationship between the two companies, but recently he went on the offensive directly. He called Polymarket’s operating model “illegal and against ethics,” and pointed out that its offshore platform is operated by a Panama entity. This past April, at an industry conference in Washington, he publicly said: “I don’t know of any regulations Panama has regarding insider trading in prediction markets—chances are there are none at all.”

Coplan studied at New York University and is good at pitching and building momentum in public. He rarely brings up Kalshi in public, but two people with knowledge of the matter said that privately, he calls it a complete copy of Polymarket’s model and believes Mansour has been trying to crush him. Last year, on 60 Minutes, he claimed: “This is the most accurate information tool humans currently have.”

Kalshi spokesperson Elisabeth Diana said the company learned about the FBI search only through news reports. She added that Kalshi routinely communicates with regulatory bodies about compliance issues and had publicly pointed out “companies that harm users’ rights and interests and damage the industry’s reputation.” Diana emphasized: “Mansour himself has no personal animosity toward Shayne. His only gripe is that the other side operates the space in a way with zero bottom line.”

Polymarket’s spokesperson, in response, quoted Emerson: “We’ll have to keep an eye on our own silver spoon for those who loudly proclaim how noble their character is.” At the same time, it said the platform has built a robust mechanism to screen for insider trading, and that it has transferred suspicious leads to law enforcement nearly one hundred times.

Coplan is a lifelong New Yorker. He founded Polymarket in 2020. In the early days, it worked out of an apartment in Lower Manhattan, with the bathroom converted into an office, and a single laptop as all the equipment. Mansour grew up in Lebanon. He used to be a trader at Castle Fund. In 2018, he co-founded Kalshi with his MIT classmate Luana Lopes Lara. Their relationship has never been friendly. In an early meeting, Coplan mentioned that both of them were raised by single mothers, which made Mansour extremely uncomfortable.

But they share one belief: prediction markets will reshape the finance and media industries, producing information of enormous value through “wisdom of crowds.” Bets are structured as “yes/no” questions, and the underlying topics include the weather, the Super Bowl, and more. Kalshi applied for a full operating license with the CFTC before it even launched in 2021, and in the early communications phase it already raised Polymarket’s compliance concerns with regulators. The main point of contact, Jeff Bandman, repeatedly urged the CFTC to investigate Coplan’s company. In January 2022, regulators fined Polymarket $1.4 million and ordered it to stop accepting bets from U.S. users.

The ban temporarily made it seem like Kalshi could dominate the U.S. domestic market. But during the Biden administration’s term, the CFTC banned election-related betting, and Kalshi sued regulators in 2023. While Kalshi was mired in the lawsuit, Polymarket kept surging—U.S. users could access the offshore website by using a VPN to change their location. Before the 2024 presidential election, the platform’s odds sparked widespread discussion online. Data showed the probability of Trump winning was far higher than what traditional polls indicated. In June, Mansour said on a podcast: “They completely bypassed the compliance process, launched the product straight away, with no reservations.”

On the eve of the election, Kalshi won in court, allowing its licensed prediction market to launch legally in the U.S. Polymarket still had no domestic qualification, but traffic surged, and Coplan suddenly became a celebrity. After the U.S. Attorney’s Office for the Southern District of New York launched an investigation, one week after Trump’s victory, the FBI conducted a sudden raid on Coplan’s apartment and seized all electronic devices.

Kalshi immediately seized the momentum. Tech media outlet Pirate Wires exposed chat screenshots showing that Kalshi employee Keaton Inglis contacted former NFL star Antonio Brown and instructed him to post on X saying Coplan was “guilty.” Brown later apologized for the post, saying he was then in a business partnership with Kalshi and casually retweeted. Mansour also apologized, saying on a December 2024 podcast: “Some members of our team were too emotionally charged at the time.”

The raid left Coplan’s team deeply suspicious. Four people with knowledge of the matter said that internally, Polymarket staff privately speculated that Kalshi—or its partners—hired private investigators to track Coplan, and after the FBI showed up, they promptly tipped off the media. Kalshi spokesperson Diana dismissed it: “This is completely baseless—those fantasies of theirs have gone so far that they’re absurd.”

Last July, Coplan went to the Manhattan rooftop restaurant Manhatta for a key business dinner, carrying a bag with a bagel in it. The other side of the dinner was billionaire Jeffrey Sprecher, founder of the Intercontinental Exchange—the company, worth $80 billion, that operates the New York Stock Exchange. Over the years, Kalshi had held luxury investors such as Sequoia Capital, and Coplan’s earlier fundraising repeatedly ran into obstacles. Both were vying for the Intercontinental Exchange’s investment. Coplan hit it off with Sprecher, and in the fall of last year, the Intercontinental Exchange finalized an investment agreement for Polymarket, with the amount reaching up to $2 billion. People familiar with the matter said that after Mansour learned the news, he was furious. He separately met with the Intercontinental Exchange’s executive team—first with a16z partner Alex Immerman on the Kalshi investor side—trying to discourage the investment. But in the end, Sprecher still chose Coplan.

This was just one of the successive good breaks Polymarket received: last July, the Trump administration tightened enforcement; the Southern District of New York dropped its investigation into Coplan. That same summer, 1789 Capital, a venture capital firm under little Trump, also announced an investment in Polymarket. On 60 Minutes, Coplan said: “This administration is strongly supporting innovation and the crypto industry, especially supporting Polymarket—this is very rare.”

To capture policy tailwinds, Polymarket must obtain a domestic operating license in the U.S. Coplan planned to acquire a company that already held compliance qualifications. Again, he ran into Kalshi’s obstruction. Five people with knowledge of the matter said rumors were circulating that Coplan intended to acquire the niche prediction platform Railbird. Mansour immediately reported potential risks related to the acquisition target to senior CFTC officials. The tip did not work. In June 2025, the CFTC approved Railbird’s operating license. Coplan ultimately spent $112 million to acquire another licensed company, QCX, and launched a lightweight U.S. version app. When it was announced in July, Coplan posted on social media a picture with the U.S. flag and wrote: “I waited for this day for so long—Polymarket is officially back on U.S. soil.”

In this battle for business, provocations have been constant. As Emerson put it: “Those who loudly proclaim their noble character—we’d better watch our own silver spoon.” When prediction markets become the new cash-printing machine, you’re not betting on an event—you’re betting on hatred between two men that never goes out.

Follow me: Get more real-time analysis and insights from the crypto market!

#GUSD年化升至3.8% $BTC $ETH $SOL # Event contract launched #ETH breaks $1,900