Billion-dollar World Cup Kalshi market ends with Spanish-speaking winner
By Etienne Mercuriali, Head of Research at BMLL
BMLL Level 2 data shows that $1.16 billion of outright World Cup contract notional traded on Kalshi through 15 July 2026. Bid–ask spreads among the leading countries had already narrowed to 0.10 percentage points before the tournament began, while France attracted the most “yes” premium before its elimination.
We explore trading conditions of Kalshi outright worldcup winner with BMLL Level 2 prediction market datasets.
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Spain and Argentina will meet in the World Cup final on 19 July, guaranteeing a Spanish-speaking champion and leaving Kalshi’s outright market with one final binary outcome. Spain entered the final as the market favourite, with an implied probability of 57.65%, against 42.45% for defending champion Argentina.
BMLL’s animation follows the market’s day-by-day repricing from 22 April, combining implied winning probabilities, contract volume, open interest and quoted bid–ask spreads. It also distinguishes between two measures that are often conflated when prediction-market activity is reported.
Kalshi’s traded notional represents the number of contracts exchanged, each carrying a $1 face value. Across 48 country markets, cumulative notional reached $1.16 billion by 15 July. Daily trading peaked at $53.4 million on 1 July, while the two semi-final days generated $22.9 million and $26.6 million respectively.
“Yes” premium measures the amount paid to acquire the affirmative side of each contract. It totalled $70.5 million across the sample. France attracted the most, at $17.7 million, followed by Argentina at $16.1 million and Spain at $10.5 million.
These figures measure trading activity rather than bettor losses, because contracts can change hands repeatedly before settlement.
Open interest provides a clearer indication of the exposure still outstanding when a country is eliminated. France had 39.3 million open contracts when Spain beat it 2–0 in the semi-final. That meant $39.3 million of face value was resolved in favour of “no” holders. England had 26 million contracts outstanding when Argentina’s late comeback produced a 2–1 victory the following day.
Open interest nevertheless describes the settlement pool rather than net profit and loss. The return earned by individual traders depends on the prices at which their positions were opened, closed or held to settlement.
Liquidity had developed well before the opening match. Among the eight leading countries, the median quoted spread rarely exceeded 1 percentage point even before the world cup started with markets getting marginally wider as more teams got eliminated.
Results then drove sharp repricing. Spain rose from 20.75% before its semi-final to 58.05% after eliminating France. Argentina increased from 19.75% to 42.45% after defeating England.
The final will conclude both the tournament and a three-month exercise in continuous price discovery across Kalshi’s World Cup markets.
BMLL’s prediction-market datasets were used for this research.
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