Polymarket vs. Kalshi: A Complete Timeline of the Prediction Market Meme Wars
Original author: Hunter Ryerson, Pirate Wires
Compiled by: Peggy, BlockBeats
Editor’s Note: From free grocery stores to meme wars fueled by mutual teasing, the rivalry between Polymarket and Kalshi has long transcended competition over products and market share—it’s a meticulously orchestrated battle for attention. This article traces the multi-year timeline of their rivalry: regulatory tug-of-wars, user bans and comebacks, “competitive meme-ing” on social media, and ultimately, marketing spectacles that spilled into the real world. Behind these seemingly absurd theatrical moves lies a continuous rise in trading volume, valuation, and capital expectations.
The following is the original text:
On the morning of February 12th in Manhattan, you wake up in a tiny, shoebox-like apartment renting for $2,000 a month, turn up the heat, shuffle to the pantry to see if you can scrape together breakfast, and then remember: at 3 a.m. last night, you already ate the last packet of instant ramen.
Just as you hesitated whether to continue contributing 20% of your income to DoorDash, a friend sent you a text saying a new grocery store called "The Polymarket" had opened on Madison Street—and everything inside was free. Naturally, you pulled on your pants, wandered down to Lower Manhattan, squeezed your way into the store, and immediately slipped into "Black Friday frenzy mode," grabbing everything within reach with your debt-ridden hands.
As you walk home with bags bulging with Sour Patch Kids and vegetables—the first you’ve touched in weeks—clutched under your arm, you pass another billboard: A market in the East Village is running a promotion—sponsored by a company called 'Kalshi,' offering $50 in free grocery credits.
Am I dreaming? How could I be this lucky?
Congratulations, you've been drawn into the latest advertising battle for prediction markets.
That's right. This week, the popular prediction market platform Polymarket announced its latest marketing stunt: opening a “completely free grocery store” in New York City, operating from February 12 to February 16.
Its competitor, another prediction market Kalshi, also didn’t hold back, launching its own “grocery-themed” campaign: offering a $50 universal grocery voucher for one day only at Westside Market on Third Avenue.
This back-and-forth imitation has prompted an X user to complain: "Kalshi and Polymarket can't even last 24 hours without copying each other."
At first glance, it seems absurd that Polymarket and Kalshi are competing in marketing over “free bananas.” But this is merely the latest chapter in years of bitter rivalry between the two platforms. Keep in mind, their weekly trading volumes reach billions of dollars. Their business model, in simple terms, allows people to bet on the outcomes of seemingly trivial events for potentially huge returns—like whether the U.S. military will arrest Venezuela’s leader Nicolás Maduro while he’s wearing casual loungewear. (That night, an anonymous, but hopefully not Pete Hegseth, internet detective made a killing.)
In summary, over the past five years of development, these two prediction market platforms have always been competitors, but the real intense rivalry only fully erupted in the last two years.
Polymarket, founded in 2020 by NYU dropout Shayne Coplan, is a cryptocurrency-based platform. Bettors must deposit USDC, a dollar-pegged stablecoin on the Polygon blockchain, to purchase "yes" or "no" prediction shares.
In contrast, Kalshi initially operated almost entirely in U.S. dollars, with trading and fund deposits and withdrawals handled through traditional bank accounts. Since its launch in 2021, it has primarily focused on sports betting, which accounts for 90% of the platform’s total trading volume. Polymarket, on the other hand, leans more toward geopolitical and cultural events, such as wars, conflicts, and elections, and even pays American influencers to promote its political content.
From 2022 to 2025, under intense regulatory pressure from the U.S. Commodity Futures Trading Commission (CFTC) and a $1.4 million fine, Polymarket temporarily banned U.S. users from its platform, effectively ceding the U.S. market to Kalshi for several years. But just months ago, Polymarket reentered the U.S. market, reigniting intense competition between the two, with friction playing out across X and beyond.
For internet users who are always online, the most entertaining part of this war has been the so-called "competitive shitposting."
In sports, this strategy takes the form of parodying official sports announcement cards—the types of images you commonly see on ESPN or FOX Sports accounts to announce trades, drafts, or injuries. Both platforms use sensational, humorous headlines to “report” sports news, such as Polymarket’s “DICK IS GROWING,” a play on Toronto Raptors player Gradey Dick’s weight gain; and Kalshi’s “LOVES RECEIVING BALLS,” referring to San Francisco 49ers running back Christian McCaffrey and his fondness for “receiving balls,” as in the literal sense of catching passes.
But when both sides are fighting for "meme-level attention," tactics also become more underhanded.
In November 2024, evidence emerged that Kalshi attempted to pay influencers—such as former NFL wide receiver and current X platform personality Antonio Brown—to post and spread negative content about Polymarket (see: “Kalshi Paid Influencers to Attack Polymarket CEO After FBI Raid”). In one case, a journalist was reportedly offered $3,500 to write a hit piece against Polymarket. (Side note: If Solana were willing to spend that much on a hit piece, I could have impeached Jackie Fielder by Monday.)
It is claimed that these influencers, allegedly paid by Kalshi, collectively have millions of followers. Over the past few years, they have been trying to gradually erode Polymarket’s credibility.
Following this incident, the Trump administration relaxed regulations on prediction markets, allowing Polymarket to make a strong return to the U.S. market. After months of preparation, the U.S. user ban was officially lifted in December, and Polymarket is now attempting to reclaim the majority share of the on-chain prediction market (currently still dominated by Kalshi, following its integration with the Solana blockchain).
One way they’ve found to “amplify their voice” is by posting news on X. Over the past few months, the brand accounts of Polymarket and Kalshi have clashed head-on in their timelines, competing for visibility with punchy headlines and celebrity quotes—sometimes at the expense of accuracy or other principles. Recently, Polymarket incorrectly attributed a quote to Jeff Bezos and greatly exaggerated deportation figures; meanwhile, Kalshi spread false claims about negotiations to acquire Greenland.
Ultimately, this feud has spilled from the online world into the real world—and hopefully, it will continue to generate positive spillover effects for ordinary Americans like you who are tight on cash. But the real point is: whether it’s marketing gimmicks like “free groceries” or trading barbs and digs on X, both companies are exceptionally skilled at generating buzz and keeping people talking about them.
No matter how suspicious the maneuvers they employ to overshadow each other—whether dark or strangely generous—we keep talking about this.
Perhaps this is exactly what they wanted. Kalshi and Polymarket are now valued at $11 billion and $9 billion respectively, and their valuations continue to rise at an astonishing pace. So, as long as the dramatic maneuvers in this wild rivalry attract a few hundred more bettors or bring in a few more investors, it’s all worth it. For these two “duelists,” it’s a win-win—if you’re willing to believe it.
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