PolymarketUS open interest nearly doubles after World Cup ends

PolymarketUS open interest reached $111 million, nearly doubling since the 2026 FIFA World Cup ended in mid-July, Crypto Briefing reported. Crypto Briefing said the growth runs counter to the broader prediction market trend, with open interest across major platforms including Kalshi down about 20% since the World Cup ended, while PolymarketUS has continued to rise.