Kalshi traded more than $5 billion in notional volume on both Saturday and Sunday, a first for the prediction market on consecutive days. Its daily data files show $5.33 billion and $5.36 billion, both above its previous record of $5.30 billion. Combos, the exchange's multi-leg contracts that work like a parlay, made up 75.6% of Saturday's volume and 74.6% of Sunday's. In July they were 36% of contracts traded on Kalshi and carried an average implied probability of 9%, against 43% for other contracts, a Bloomberg analysis showed. The weekend followed a filing on Friday in which the American Gaming Association (AGA), ... (full story