From Singapore: When US and Israeli forces struck Iran in the early hours of Saturday morning, killing Supreme Leader Ayatollah Ali Khamenei, traders on the prediction market Kalshi were watching their positions surge. What came next was not a windfall. It was a lesson in fine print.
Kalshi, the Manhattan-based exchange regulated by the US Commodity Futures Trading Commission (CFTC), had been running a contract asking whether Khamenei would be "out" as Supreme Leader by various deadlines, including March 1. The market had accumulated over $50 million in total trading volume. Roughly $20 million of that traded on Saturday alone, according to prediction market analyst Dustin Gouker.
Before the early Saturday morning attacks, shares of Khamenei being ousted by March 1 were trading at just 9 cents. With his death confirmed on 28 February, traders assumed their YES shares would be redeemed at $1. Instead, shares in the market were resolved at 9 cents. The gap between those two numbers represents the kind of contract ambiguity that can turn a winning trade into a very expensive lesson in reading the terms and conditions.
The culprit was a clause Kalshi calls the "death carveout." Kalshi's fine print on the contract advised that if Khamenei were to die, the market would "determine payouts to the holders of long and short positions based upon the last traded price prior to death." Kalshi later conceded that the rules were "grammatically ambiguous" and that similar contracts in future would be better explained. Under the CFTC-filed contract terms, positions settled at the last-traded price before his death, which Kalshi CEO Tarek Mansour said was recorded at 1:14 AM ET Saturday.
One user who bought $303.90 worth of YES shares at 6% implied odds posted a screenshot showing he was to receive $4,588 should the market have resolved at $1. Instead, he was paid $91.76. Multiply that kind of discrepancy across thousands of traders and the reputational damage becomes clear.
Kalshi's decision created an uproar among traders, who felt like they had been duped. They were all the more infuriated having watched the company heavily promote the Khamenei market for days on social media. While prices were spiking, the company posted on X: "BREAKING: The odds Ali Khamenei is out as Supreme Leader have surged to 68%" alongside reminders that the market did not settle on death. Critics found the juxtaposition difficult to reconcile.
The comparison with former president Jimmy Carter's death market has added fuel to the fire. After Carter died in late December 2024, Kalshi settled that contract to "No." "You settle on death, just not when it makes you money," one widely shared post on X argued, contrasting that outcome with the Khamenei death carveout.
Mansour has sought to limit the damage. Kalshi is reimbursing all fees and net losses from trading in the market, with impacted traders able to find their credits under "Your activity" on the app and website. "We included every precaution on this market to make sure people could not trade on the outcome of death," the company said. "Our rules were clear from the beginning, we never changed them, and we settled based on the rules. We reimbursed all fees and net losses because we thought the UX could have been clearer for users."
There is a legitimate regulatory logic behind Kalshi's position. As financial instruments regulated by the CFTC, prediction markets are prohibited from offering event contracts involving terrorism, assassination, and war. The death carveout was precisely designed to comply with those restrictions, not to short-change traders. Mansour argued the Khamenei market served legitimate purposes, citing geopolitical, economic, and national security implications of Iranian leadership changes, and pointed to Venezuela's recent power transition as evidence that autocratic leaders can leave power without dying. That argument holds intellectual merit. The problem is that legitimacy in design does not equal clarity in disclosure, particularly when the platform's own social media accounts were driving trading volume with real-time odds updates.
The contrast with rival platform Polymarket sharpens the picture. An account trading under the username "Magamyman" made more than $553,000 placing bets on Polymarket that Khamenei would be out of power just before an Israeli strike killed him on Saturday. Polymarket operates offshore and is not available to users in Australia or the United States in its standard form. The divergence in outcomes between the two platforms will intensify calls for clearer international standards around geopolitical event contracts.
The controversy arrived at a charged moment for the industry. Days earlier, six Democratic senators led by Adam Schiff sent a letter to CFTC Chairman Michael Selig urging the agency to ban contracts that resolve on or correlate to an individual's death, citing controversial Polymarket contracts tied to Venezuela and Ukraine. The Coalition for Prediction Markets responded that "contracts involving death have no place on American exchanges." The letter set a March 9 deadline for the CFTC to respond.
For Australian participants watching from the sidelines, the implications are more than academic. Following a $300 million Series D funding round, Kalshi was valued at $5 billion. Platforms at that scale shape global investor behaviour and set precedents that regulators in other jurisdictions, including Australia's own Australian Securities and Investments Commission (ASIC), will eventually need to address as prediction markets seek broader geographic reach. The question is not whether event-contract platforms have a commercial future; they clearly do. The question is whether that future rests on contract terms that retail participants can actually understand before they commit their capital.
The Khamenei episode exposes a tension that sits at the heart of the prediction market industry. These platforms present themselves as sophisticated financial instruments, price-discovery mechanisms that aggregate dispersed information with precision. That case is strongest when the rules are equally precise. When a $54.5 million market attracts accusations of ambiguity from its own CEO, it suggests the industry's contractual infrastructure has not kept pace with its commercial ambitions. Reasonable people can disagree about where to draw the line on geopolitical event contracts. Fewer would argue that the line, wherever it sits, should be written in language that requires a lawyer to parse.