The daily trading volume across prediction markets reached an all-time high of over $700 million on January 12, 2026, with the platform Kalshi capturing a dominant 66.4% market share. This translated to a record-breaking single-day volume of $466 million for Kalshi, driven largely by sports betting contracts on events like the NFL, NBA, and NHL.
Kalshi's market leadership is further solidified by its Open Interest of $314.08 million, representing 41.1% of locked-in value across 10,000 active contracts, according to Dune Analytics. The platform processed 2.10 million trades with a notional value of $383 million. Competitors Polymarket and Opinion each held a 14.3% share of the total daily volume, equating to approximately $100 million each.
This surge in activity coincides with heightened regulatory scrutiny on the prediction market sector. Reports of the $701 million daily record have surfaced amid what is described as a "regulatory crackdown," raising significant questions about compliance and market transparency. The lack of verified official confirmation for the total volume figure underscores the tense environment.
Kalshi's growth has been explosive. The platform ended 2025 with a total notional volume of $23.8 billion, a year-over-year increase of more than 1,100%, and processed 97 million transactions. A key driver recently has been the launch of its "Combos" feature, a parlay-style contract product that processed over $100 million in volume in its first week, according to co-founder and CEO Tarek Mansour.
