Polymarket Traders Clash Over $345 Million Iran Peace Market

A proposed deal to end hostilities between the US and Iran gave equities and bond traders a measure of relief on Monday. It also left prediction markets with a new headache.

Polymarket, one of the largest event betting exchanges, has hosted more than $345 million of trading on the question of whether and when the US and Iran would sign a peace deal.

Both countries announced they had an agreement over the weekend, and some traders thought they had won a payout. But the bets are in limbo because it was not clear if the announcement was enough to meet ...