Trading volume across eight of the largest prediction-market platforms reached $3.12 billion on the first Sunday of this season’s NFL action, following $3.17 billion on Saturday. Kalshi led the weekend with $4.89 billion in volume, including more than $590 million on individual Week 1 NFL contracts. That figure ranked as the second-highest all-time volume for a Kalshi event, behind only the 2026 World Cup winner, while Sunday’s activity set a platform record of $2.433 billion. Polymarket recorded $404 million on Sunday, below its $532 million average day during the World Cup. Strong market activity coincided with a high-scoring NFL slate: 14 players scored multiple rushing or receiving touchdowns, 10 teams reached at least 30 points, and nine of 13 Sunday games exceeded their total-points lines. After Monday night’s game, the NFL tied the post-merger Week 1 scoring record of 791 combined points set in 2012, with 16 games averaging 49.44 points.