Kalshi Breaks Volume Records Over NFL Week 1 With $4.859 Billion in Trades

Kalshi posted its largest weekend on record during NFL Week 1. Saturday volume hit $2.426 billion, topping the prior all-time high, before Sunday volume edged higher at $2.433 billion for a two-day total of $4.859 billion.

Parlays accounted for more than half the activity both days, with $1.47 billion on Saturday and $1.48 billion on Sunday. Straight bets contributed $328.7 million and $409.9 million respectively. The busiest single market was the Cowboys-Giants Sunday Night Football contest, which saw $56.3 million on the winner and $16.3 million on the spread. The Ohio State-Texas college game drew $52.1 million on Saturday.

Volume Mechanics, Taker Results and Fee Totals

Total volume on prediction markets does not map directly to sports betting handle. Kalshi counts both sides of every trade, and market makers dominate long-odds parlays. Taker-side volume, a nearer proxy for conventional handle, reached $555.7 million on Saturday and $596.7 million on Sunday, short of the $640.3 million record set July 11.

Fees collected stood at $15.99 million Saturday and $16.02 million Sunday, narrowly below the $17.1 million earned on July 11. Over the full week Kalshi averaged $12.1 million in daily fees. Takers lost $2.1 million before fees and $15.2 million after; on parlays alone the pre-fee loss was $200,000 and the post-fee loss $4.1 million. As reported by InGame, Citizens analysts Jordan Bender and Isabelle Slavin found Kalshi offered 3% lower implied vig than FanDuel and 4% lower than DraftKings on moneyline and totals, though parlay implied vig reached 23.8% versus 22.0% at the sportsbooks.

The Record Parlay Block Trade and Open Questions

The weekend also produced the largest known parlay “yes” stake in Kalshi history: two block trades totaling $3.7 million notional on a three-leg NFL parlay (Cowboys, Raiders and Eagles to win), with the taker committing exactly $1 million. Block trades are typically used by institutions to hedge risk rather than by retail bettors; the parlay lost when the Giants beat the Cowboys. Sportsbooks hold obvious motive to lay off parlay exposure, and Kalshi maintains a rebate program aimed at them.

The numbers confirm rising liquidity and tighter spreads on core markets, yet the outsized role of maker-heavy parlays limits how directly these figures translate to traditional operator economics. Sustained daily fees near $12 million would annualize above $1 billion in quarterly revenue, but only if the mix of long-odds activity persists without adverse selection or regulatory friction.

Reporting: InGame

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