Kalshi, Polymarket open interest falls 20% as World Cup frenzy winds down
Prediction market activity slumped after Spain beat Argentina in the World Cup final. Kalshi's weekly volume fell about 55% from roughly $9 billion in the week of July 5 to about $4 billion, and Polymarket's dropped nearly 70% from $2.3 billion to $740 million, while combined open interest slipped from about $1.8 billion to $1.5 billion.
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