A proposed agreement aimed at ending hostilities between the US and Iran provided relief to stock and bond traders on Monday, but also presented new challenges for prediction markets. On Polymarket, one of the world's largest event prediction trading platforms, the trading volume on whether the US and Iran will sign a peace agreement and when has exceeded $345 million. After both countries announced an agreement over the weekend, some traders believed they were in line for a payout. However, it remains unclear whether the announcement meets the conditions outlined in the Polymarket contract, leaving these bets in limbo. A proposal on Sunday night to determine the contract as 'yes'—indicating that a peace agreement has indeed been reached—was quickly challenged by UMA holders. UMA is the cryptocurrency used by Polymarket to handle market disputes. Some who disputed the outcome argued that the contract terms have not been met, as no documents have been signed by either party and it is still uncertain whether the agreement signifies a 'permanent' end to the conflict. This is the latest and one of the largest disputes faced by Polymarket, highlighting the difficulties prediction markets encounter when dealing with 'yes or no' determinations related to complex real-world events. (Sina Finance)