- ▸ Kalshi crossed $100 billion in lifetime notional volume and recorded its first-ever billion-dollar single days on Saturday and Sunday, driven by World Cup group-stage trading and NBA/NHL finals.
- ▸ Kalshi posted $6.38B in weekly notional for the week of June 8, up 43% week over week and the largest single week on record, while Polymarket Global rose 22% to $2.33B.
- ▸ Kalshi’s lifetime total of $102.30B now leads Polymarket’s $93.28B, with the gap widening as World Cup volume accelerates through the group stage.
Kalshi crossed $100 billion in lifetime notional volume last week, and followed it up with its first-ever billion-dollar trading days on Saturday and Sunday. Kalshi’s notional volume total for the week of June 8 came in at $6.38 billion, up 43% from $4.46B the prior week, marking yet another weekly volume record by a wide margin. To put the week into perspective, Kalshi posted $6.6 billion for the entire month of December.
Polymarket Global posted $2.33 billion notional volume the week of June 8, up 22% week over week for its strongest week in recent data. Combined, the two platforms accounted for nearly $8.7B in notional volume, roughly what Kalshi alone was doing on a monthly basis just three months ago.
Kalshi’s lifetime notional volume now stands at $102.30B, ahead of Polymarket’s $93.28B, according to Dune Analytics. The gap reflects how sharply the two platforms’ growth trajectories have diverged since April, when Kalshi first pulled ahead on monthly volume and transactions. Both platforms are on an upward trend in terms of weekly volume with World Cup trading in full swing.
Kalshi vs. Polymarket Last 8 Weeks (Thru June 14)
World Cup group stage hits both platforms
The World Cup group stage, which opened June 11, is the primary driver of this week’s surge on both platforms. On Kalshi, Sports volume jumped 52% to $3.38B and Exotics, the platform’s parlay-style combo contracts, crossed $2 billion in a single week for the first time, reaching $2.06B (+56% WoW). Together, Sports and Exotics accounted for 85% of Kalshi’s weekly notional, consistent with the concentration trend that’s defined the platform’s volume mix year-to-date. Kalshi election markets, which had surged to $115.8M the prior week on California primary and LA mayoral activity, fell back to $38.6M as those contracts resolved.
Polymarket’s Sports category nearly doubled, rising 80% to $1.61B as World Cup winner and group-stage markets dominated the platform’s top contracts. That surge offset a sharp pullback in Crypto, which dropped 60% to $280M after the prior week’s $664M spike. Bitcoin price stabilization appears to have pulled activity out of that category. Politics held at $247M, with Trump-tagged markets doubling to $111M.
First billion-dollar days
The weekend numbers are impressive. On Saturday, June 13, Kalshi hit $1.224B in daily notional for its first-ever billion-dollar day. Sunday, June 14 came in at $1.236B, topping it. Polymarket ran $374M and $479M on the same two days, respectively. The table below shows daily notional for both platforms across the six most recent weekend days tracked:
| Date | Kalshi | Polymarket | Key events |
|---|---|---|---|
| May 30Sat | $800.6M | $277.5M | NHLStanley Cup Final Game 4 Hurricanes 5, Golden Knights 3 |
| May 31Sun | $589.5M | $282.1M | — |
| Jun 6Sat | $658.8M | $243.6M | World CupTournament opens Mexico 2–0 South Africa · South Korea 2–1 Czechia |
| Jun 7Sun | $611.1M | $252.0M | World CupDay 2 Canada 1–1 Bosnia · USMNT 4–1 Paraguay |
| Jun 13Satrecord | $1.22B | $374.1M | NBAFinals Game 5 — Knicks win championship World CupBrazil 1–1 Morocco · Qatar 1–1 Switzerland · Scotland 1–0 Haiti |
| Jun 14Sunrecord | $1.24B | $479.0M | UFCFreedom 250 at White House — Topuria vs. Gaethje NHLStanley Cup Final Game 6 — Hurricanes win Cup World CupGermany 7–1 Curaçao · Netherlands 2–2 Japan · Australia 2–0 Türkiye · Ivory Coast 1–0 Ecuador |
Notional volume via Dune Analytics. Kalshi and Polymarket Global only. Weekend days shown.
Compared to the previous weekend, Kalshi’s daily volumes nearly doubled. The driving force is no secret as the weekend was packed with sports action. On Saturday, the Knicks closed out the Spurs in Game 5 to win New York’s first NBA title since 1973, while three World Cup group-stage matches ran concurrently.
Sunday’s sports slate was even more packed. The Hurricanes won the Stanley Cup in Game 6 in Las Vegas, five World Cup matches were played across the globe, and UFC Freedom 250, the first UFC event held on the South Lawn of the White House, headlined by Ilia Topuria vs. Justin Gaethje for the undisputed lightweight title, drew what Dana White projected would be Super Bowl-level viewership. It was the most concentrated single-day sports calendar of 2026, and the prediction market volume reflected it.
Kalshi crossed its major $100 billion milestone on Friday, Dustin Gouker noted in his Event Horizon newsletter, before the weekend surge pushed the lifetime total further.
What to watch
The World Cup knockout rounds begin June 29. If group-stage weekend volume is sustaining billion-dollar daily totals on Kalshi, the single-elimination format, where each match is terminal, could push per-match contract activity higher still. The Fed’s June 16–17 meeting adds a near-term macro catalyst, with both Kalshi and Polymarket pricing a 99% probability of no rate change. Both platforms could easily sustain their current peak volumes through the 2026 FIFA World Cup finals.
