Polymarket and Kalshi surpassed $2B in notional trading volume in the week ending Oct. 19, exceeding the previous peak during the 2024 US presidential election (Emily Nicolle/Bloomberg)

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Polymarket and Kalshi surpassed $2B in notional trading volume in the week ending Oct. 19, exceeding the previous peak during the 2024 US presidential election (Emily Nicolle/Bloomberg)

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