Parlay combinations drove approximately 70% of nearly $4 billion in daily notional volume on prediction market platform Kalshi during October 10–11. The figures represent contract values at full payout rather than actual buyer costs, highlighting the outsized role of multi-leg bets in driving reported trading activity. The analysis underscores how combo wagers significantly inflate notional volume metrics on event contract platforms. While parleys dominate headline volume numbers, the distinction between notional value and capital deployed remains critical for accurately assessing true market participation and liquidity.