Polymarket Breaks $478 Million Record as Kalshi Khamenei Market Sparks Backlash

Polymarket recorded a single-day notional trading volume of $478 million, with the politics category alone accounting for $220 million, nearly half of total daily activity. Elsewhere, rival prediction market Kalshi was on the receiving end of user backlash after a controversial contract over the Khamenei market. Polymarket Sets Historic Record as Geopolitical Tensions Drive Crypto Betting Prediction markets surged to historic highs as the United States and Israel launched coordinated strikes on Iran. Polymarket Notional Volume Smashes $478 Million. Source: Defioasis Polymarket reached an all-time high across the platform and its political markets. According to data aggregated by Defioasis, Polymarkets spike coincided directly with the strikes. 在美以对伊朗实施联合打击当天，Polymarket 单日交易量创下历史新高，名义交易量达到 4.78 亿美元其中政治板块达 2.2 亿美元，同样创下历史新高，占比当日 Polymarket 名义交易量的 46.2%此外，Polymarket Builders 在这历史节点上同样创下了单日交易量新高 pic.twitter.com/KnKmWO3vAn defioasis.eth (@defioasis) March 1, 2026 It signals the platforms capacity to price geopolitical events faster than TradFi markets or polling models. Certain strike-timing contracts set their own records, with individual trades clearing up to $90 million, reflecting the massive liquidity flowing into the platform. However, the traction was also marred by allegations of insider trading, with Bubblemaps identifying at least six addresses that profited approximately $1.2 million from bets tied to the Iran conflict. JUST IN: 🇮🇷 🇺🇸 Six suspected insiders made $1.2M betting on a US strike on IranMost of these wallets: were funded in the last 24h specifically bet for February 28 bought "yes" hours before the strike pic.twitter.com/n3G6OIEOXt Bubblemaps (@bubblemaps) February 28, 2026 The surge in activity shows how prediction markets are increasingly blurring the line between financial speculation and geopolitical forecasting, drawing attention from traders, lawmakers, and regulators. The timely pricing of real-world events demonstrates the efficiency of blockchain-based markets. However, it also raises concerns about transparency and fairness, particularly when wallets appear to perfectly anticipate outcomes. Kalshi Faces Backlash Over Khamenei Market, CEO Defends Settlement and Ethics Meanwhile, Kalshi, a US-regulated prediction market, faced its own controversy with the contract titled Ali Khamenei out as Supreme Leader? The market, which had accumulated over $50 million in total volume, saw roughly $20 million traded on strike day alone. Following Khameneis reported death during the strikes, critics argued the platform had effectively created a proxy death market, despite its stated rules against profiting from death outcomes. You settled Jimmy Carter to "No" on attending Trump's inauguration after he died. You knew people were betting the 99 year old would die before the event. You settle on death, just not when it makes you money. This has nothing to do with death, this has everything to do with your pic.twitter.com/HD5Mr7kwph jellyman (@jellymanguy) March 1, 2026 Kalshi CEO Tarek Mansour addressed the backlash on X (Twitter), emphasizing that all positions would be settled at pre-death last-traded prices. Meanwhile, post-death positions would be fully reimbursed, including all trading fees. Mansour defended the markets design as consistent with U.S. regulations. He noted that leadership changes in Iran carry significant geopolitical, economic, and national security implications. This, he said, makes such markets relevant without directly incentivizing death. A market on Ali Khameneis out as Supreme Leader was important because leadership changes in Iran have a major impact on the world order, Mansour wrote, outlining that traders could still profit or lose based on legitimate political outcomes rather than mortality. The settlement process, he explained, adhered strictly to the CFTC-filed contract terms, which referenced the last-traded price prior to Khameneis death, even amid ambiguities in reporting timelines. Reposting because my other message was unclear: We settled the market to last traded price before time of death (per our rules). All positions, no matter when they were opened, got paid out on the last-traded price before his death.On top of that, if you bought a position Tarek Mansour (@mansourtarek_) March 1, 2026 On the one hand, Polymarket is setting new benchmarks for trading volume amid geopolitical tension. Meanwhile, Kalshi is facing ethical scrutiny. Both events highlight the potential and the risks of prediction markets. These platforms offer unprecedented speed and transparency in pricing world events. However, as February 28 demonstrated, they also amplify ethical dilemmas and regulatory attention during crypto-driven speculation.