Traders are challenging a prediction market platform after alleging they were denied payouts tied to bets on Iran’s leadership. Participants filed a $54 million class action lawsuit on March 5 against event-trading platform Kalshi over contracts related to Iran’s Supreme Leader Ayatollah Ali Khamenei.

The lawsuit, filed in the U.S. District Court for the Central District of California, centers on a prediction market asking whether Ayatollah Ali Khamenei would be out as Iran’s Supreme Leader by a specified date. Traders participated in what was known as the “Khamenei Market,” which gained traction amid escalating geopolitical tensions surrounding Iran’s leadership. After Khamenei was killed in military strikes, plaintiffs argue the market should have resolved in their favor because his death meant he was no longer serving as Supreme Leader.

“With an American naval armada amassed on Iran’s doorstep and military conflict not merely foreseeable but widely anticipated, consumers understood that the most likely — and in many cases the only realistic — mechanism by which an 85-year-old autocratic leader would ‘leave office’ was through his death,” the lawsuit states, adding:

“Defendants understood this as well.”

Plaintiffs claim the platform applied a contractual “death carveout” provision to block payouts after Khamenei’s death. The lawsuit alleges this interpretation of the rules prevented traders from receiving winnings tied to the market outcome and characterizes the conduct as deceptive and predatory.

Kalshi co-founder and CEO Tarek Mansour took to social media platform X to defend the company’s handling of the market and clarify its rules. “We stand by principle and law,” he wrote, emphasizing:

“Kalshi didn’t deviate from its market rules. They were clear that death did not resolve the market to ‘Yes’.”

“Kalshi’s rules prevented a ‘death market’, where traders directly profit from death. This is a good thing (+ we’re a US based market),” Mansour outlined the reasoning behind the clause. The executive also addressed the company’s handling of user funds, stating: “Kalshi made no money here, and even reimbursed all losses out of pocket. Not a single user walked away losing money from this market.”

In additional posts on X this week, Mansour detailed how the platform handled the disputed market and addressed trader complaints. He explained that the rules were never changed and that both the “death carveout” and the settlement method were included in the published guidelines from the outset. Mansour said the contract was settled using the last traded price before the time of death, noting that traders were paid according to that rule even though some expected the market to resolve to “Yes.”

He also stressed that Kalshi does not offer markets that settle directly on a person’s death and designs its rules to avoid direct profit from violent outcomes such as assassination, war, or terrorism. Mansour further stated the company reimbursed all trading fees and covered net losses out of pocket, saying the firm ultimately absorbed a financial loss to make users whole while planning improvements to how exceptions like death carveouts are displayed in future markets.

• Why are traders suing prediction market platform Kalshi over the Khamenei market?
  Traders claim Kalshi wrongfully denied payouts after Ayatollah Ali Khamenei’s death by applying a contractual “death carveout” that prevented the market from resolving in their favor.
• What is the “death carveout” rule at the center of the Kalshi lawsuit?
  The rule states that a participant’s death does not automatically resolve a market outcome, which Kalshi says prevents users from profiting directly from violent events.
• How did Kalshi settle the disputed Iran leadership prediction market?
  Kalshi says the contract was settled using the last traded price before Khamenei’s death and reimbursed trading fees while covering user losses out of pocket.
• Why does this lawsuit matter for prediction market investors?
  The case highlights regulatory, contract interpretation, and rule-clarity risks that could affect investor confidence and the structure of future event-trading markets.

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