The 2026 World Cup is projected to draw more than $2.5 billion in trading volume across US prediction markets, with Kalshi taking in an estimated $1.47 billion of it, according to DeFi Rate projections.
As a global event that has historically drawn limited US interest, it arrives at the exact moment these markets have the scale and widespread US access to absorb it and a number of firsts that make this entirely possible.
The 2026 World Cup runs 104 matches across the group stage and knockout rounds — more than double the 2022 tournament’s 64 and far larger than a March Madness bracket or the NBA playoff run, which is why volume is projected to run high.
Kalshi volume scenario explorer
The forecast hinges on one question: how heavily will individual World Cup matches trade? Drag the slider to see the projected total move.
Basis: Kalshi trade-tape (notional), same basis as the reported "$1.8B March Madness" figure. First World Cup with broad legal US access — the $1.9B mark is a first-access benchmark, not a hard cap. Through May 29, 2026.
Interest in fixtures will determine how high this gets
How big this market will be, depends on a lot of variables. We modeled three scenarios below, and landed in the most likely scenario of $1.47B.
The conservative case (~$0.85 billion) assumes World Cup matches trade thinly, with limited US interest in fixtures between other countries. This is unlikely, but could happen if the matches fall short or interest dwindles with the month long tournament.
The base case (~$1.47 billion) assumes matches trade at US-domestic playoff levels, where March Madness games averaged roughly $13 million each, landing the tournament just below March Madness overall.
The explosion case (~$1.93 billion) reflects a surge in first-time participation, the kind of jump that followed broad access to the Super Bowl—an upper benchmark rather than a ceiling.
Winner market clearing $2M per day
With less than two weeks before kickoff, the winner contract is now running on a trajectory of nearly $2 million a day — roughly two and a half times the pace March Madness’s champion market ran before at the same timeline, and 2.1X of NBA Championship Winner market.
The World Cup Winner market comes in at $203–336 million, with a base case near $253 million.
Current trajectory of the World Cup Winner market compared to marquee markets
Aligned by days until each tournament starts. At the same point in the run-up, the World Cup winner market is well ahead of where March Madness was. Drag to set how hard it accelerates — from NBA-like to March-Madness-like.
Cumulative trade-tape volume, aligned to each tournament’s start (kickoff / Round of 64 / playoff tip-off). At 13 days before its start, the World Cup winner sits at $48M vs ~$5.6M for March Madness at the same point. Vertical line = tournament start. Dashed line = projection to the July 19 final. Through May 29, 2026.
The NBA champion market is still trading; the 2026 Finals run through June 19, so its total will rise above the $229M shown. Markets also opened well before this window — the World Cup winner on May 15, 2025, the NBA champion on July 12, 2025 — with near-flat early volume.
The numbers driving the different layers
The 104 matches ($1.19B base): This is the engine of the forecast — roughly 80% of the total. Each match was assigned to an interest tier (marquee, premium, standard, long-tail) using current trading volume to rank the matchups, then priced against what comparable completed games actually finished at: March Madness single games (which averaged about $13 million, topping out above $52 million for the final) and NBA playoff series. We also cross referenced against Champions League interest.
| Tier | Matches | Conservative $/match | Base $/match | High $/match |
|---|---|---|---|---|
| Marquee (host openers, late KO, marquee group) | 10 | $22,214,778 | $28,968,538 | $34,786,139 |
| Premium (strong matchups, early KO) | 24 | $11,286,492 | $20,598,768 | $24,437,489 |
| Standard (mid-interest group) | 42 | $3,058,318 | $9,146,183 | $13,970,587 |
| Long-tail (low-interest group) | 28 | $470,655 | $773,473 | $1,602,844 |
| MATCH LAYER TOTAL | 104 | $634,651,284 | $1,189,852,742 | $1,566,005,412 |
The winner contract (~$253M base): Projected from its own live trajectory. As of late May, the winner contract reached $48 million and was roughly two and a half times the pace the March Madness champion market ran at the same point before its own tournament, 13 days out.
| Scenario | Multiple (field-set→end) | WC Champion finish | Not |
|---|---|---|---|
| Low (NBA-like) | 2.9x | $202,784,724 | NBA-like gentle accrual off a large base |
| Base | 3.5x | $244,740,185 | Center estimate — primary published number |
| High (toward MM) | 4.5x | $342,205,952 | WC 38-day tournament sustains multiplier longer than NBA |
Applying the way completed champion contracts grow from the start of their event through to settlement produces a $203–336 million range. It is unlikely, though not impossible to reach PGA-level numbers.
Smaller layers. Advancement markets (will a team reach the round of 16, quarterfinal, etc.), anchored to NBA’s equivalent advancement markets, add roughly $9 million. The Golden Boot — the World Cup’s individual-award market, anchored to NBA’s MVP markets — projects to about $12 million, already outpacing its NBA equivalent.
A bundle of novelty and prop markets (squad announcements, halftime show, group props) adds a few million more.
| Scenario | During-event multiple | Settlement | Logic |
|---|---|---|---|
| Low (knockout collapses, MM-like) | 3.0x | $4,741,320 | Knockout tiers behave like MM |
| Base (mixed group+knockout) | 5.0x | $8,841,058 | Group advancement stays live (NBA-like); knockouts collapse |
| High (NBA-like throughout) | 7.0x | $13,691,881 | All advancement tiers trade through like NBA conference markets |
How we got here
The forecast is built bottom-up: every category of World Cup market is projected separately, then summed. Each layer is anchored to a completed, US-domestic event of the same structural type — March Madness and the NBA playoffs — as those are the closest comparables for how Americans trade a major tournament on a US prediction market. Soccer events were not used as anchors, but as a basis for interest on trading fixtures and activity on game day.
This is a US-hosted summer tentpole and the relevant question is how it will trade, not how European club soccer does.
The forecast rests on three completed Kalshi events, all measured on the same trade-tape basis:
- March Madness 2026: ~$1.6 billion total; 109 individual games averaging ~$13 million each; champion contract $169 million.
- NBA 2026 playoffs: champion contract ~$229 million; per-series markets averaging ~$19 million.
- 2026 Champions League: roughly 91 percent of each match’s volume traded on game day, versus ~31 percent for March Madness games and ~23 percent for NBA series.
These set the per-event “levels” that the World Cup markets are anchored to.
Across 109 March Madness games, a game’s pre-event volume ranking corresponded to its final volume ranking with a correlation of 0.65 — a moderate, useful signal that lets DeFi Rate tier World Cup matches by expected size, though it doesn’t pin down any single match’s final total.
Importantly, the model uses current World Cup volume primarily to rank matches into tiers, not to directly extrapolate final volume.
The difference between Kalshi and the final number is layered in based on Polymarket US numbers now and a hedge on DraftKings, Fanduel and other prediction markets. These are unknown.
Caveats that could shift in either direction
The match layer is the swing factor, and it rests on one unmeasurable assumption. This is the first big year of prediction markets and the first World Cup.
The question becomes does the tournament attract US-domestic-tournament-level volume — or fall short because most matches lack a US rooting interest? Neither of these questions can be answered in advance.
But it does account for almost the entire gap between the conservative and high edge cases.
- If group-stage matches between non-US teams trade thin, the total lands near the bottom of the range; if the US-hosted novelty drives broad engagement, it approaches the top.
- Through our analysis, we found 90%+ of volume concentrates violently on game day for European soccer matches traded on a US exchange. This means the bulk of the forecasted total has not happened yet.
- The current ~$72.7 million in tracked World Cup volume is a seed, not a trajectory. Early tournament results will be the first real read on whether the base case holds.
- The $203–336 million projection also assumes the contract keeps building through the group stage and knockouts the way completed champion markets did. This is a very likely scenario, as the World Cup has a more diffuse favorite (48 teams) and resolves more gradually than a single-elimination bracket, which could flatten the curve.
This is the first World Cup with US prediction-market access — and there is no precedent for what that does to volume.
It will arrive at the same first-open inflection the Super Bowl just passed through and each major event since has drawn substantially more volume and interest. This kind of surge is the strongest argument for the high end of our range — and a reason the true ceiling may sit above it and should be read as a benchmark rather than an upper bound or ceiling.
Methodology:
We reviewed approximately $2.44 billion in trade-tape volume across roughly 7,550 market rows was reviewed, drawing on about 9.8 million individual raw trade records paged from the API (March Madness 6.98M, NBA 1.73M, Champions League 1.07M; World Cup volume is reported at the daily series level, without a per-trade count).
