The International 2026 has barely started, and prediction-market trading on it already runs into the millions of dollars. Dota 2 bettors never needed much encouragement when it comes to Valve’s annual world championship, which packs a short tournament, huge swings in team form, and enough individual statistics to support markets on everything from outright winners to map kills. This year’s edition is underway in Shanghai, and the money arrived well before the arena stage.
The tournament runs from Aug. 13 to 23, starting with 16 teams in a Swiss-format group stage through Aug. 16. Eight of them advance to the main event at the SPD Bank Oriental Sports Center from Aug. 20 to 23, where the format switches to a double-elimination bracket and ends with a best-of-five Grand Final. Valve organizes TI together with PGL and Perfect World, and the latter matters quite a lot for the event’s return to China. Shanghai previously hosted The International in 2019.
The audience explains why bookmakers and prediction markets care so much. The International 2025 averaged 582,229 concurrent viewers, generated 63.2 million hours watched, and peaked at 1.785 million during Team Falcons’ five-game Grand Final win over Xtreme Gaming, while TI10 still holds the series record at 2.74 million peak viewers. The 2026 tournament had already hit 804,803 concurrent viewers during its opening stages as of Aug. 14, averaging roughly 495,000 across its first 25 hours. Once the Shanghai arena opens, those numbers should climb considerably.
Polymarket’s outright market on the TI 2026 winner has passed $1.07 million in trading volume. TEAM VISION, the name PARIVISION is using at the tournament, leads with a 35% implied probability, with Team Spirit second at 20% and BoomBoys, better known as BetBoom Team, at 14%. Team Falcons sits at 12%, Team Liquid at 9%, and Team Yandex has dropped sharply to just 6%. These are live prediction-market probabilities rather than fixed bookmaker odds, so they can move significantly as matches are played.
The naming situation deserves a word, since it’s mildly absurd for an article about betting. TEAM VISION is PARIVISION, and BoomBoys is BetBoom Team; both are competing under altered names at TI because of restrictions on branding. PARIVISION won the Dota 2 tournament at the 2026 Esports World Cup in July, beating BetBoom in the final, which goes a long way toward explaining why the same two rosters sit near the top of the TI market even with their usual betting-company-backed identities missing from Valve’s broadcast.
Traditional sportsbooks had roughly the same group at the front before play began. Cloudbet odds collected on Aug. 12 priced PARIVISION at 3.12 in decimal odds, ahead of Team Yandex at 4.69, Team Liquid at 5.35, and BetBoom at 5.66, while defending champion Team Falcons sat considerably further back at 11.2. Those numbers are already going stale as matches are played, though that’s rather the point of betting on a tournament where one bad day can end a team’s run.
Kalshi’s outright market is much smaller, with only around $5,000 in volume at the time of writing and TEAM VISION at roughly 40% against BoomBoys at 32%. The gap with Polymarket matters when reading those probabilities, because a market with a few thousand dollars traded moves much more violently than one with seven figures of turnover. Kalshi is seeing far heavier activity on individual TI matches, however, with the OG versus Team Resilience market alone recording more than $164,000 in volume.
Polymarket’s bettors show the same preference for match-by-match action over waiting ten days for an outright winner. Its page covering Team Liquid versus Team Spirit on Aug. 14 displayed around $3 million in combined volume across the associated markets, and those contracts went well beyond picking the series winner, covering individual games, kill totals, handicaps, first blood, and other in-game outcomes. The headline outright market, in other words, is only a fraction of the money moving around TI.
There’s no reliable public figure for the total wagered on The International across regulated sportsbooks worldwide. Operators like bet365 and the esports-focused bookmakers generally don’t publish real-time handle for individual tournaments, so stacking Polymarket and Kalshi numbers on top of an invented global total would mostly produce a very precise-looking piece of nonsense.
What can be measured publicly is already substantial: more than $1 million on one Polymarket futures market, millions more on individual matches, and six-figure trading on some Kalshi fixtures before the playoffs have even begun.
The market will get considerably easier to read after Aug. 16, once the Swiss stage and elimination matches cut the 16-team field to eight. TEAM VISION has emerged as the biggest favorite for now, but there’s little agreement behind it, and that’s fairly normal for this event. Dota 2’s biggest tournament has spent 15 years finding elaborate ways to make sensible predictions look foolish by the following afternoon.