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June 7-13, 2026 → The Defiant — Google Trends five-year high of 100 for “prediction market”
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August 9-15, 2026 → The Defiant — most recent complete week read 17, down 83% from peak
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July 19, 2026 → The Defiant — daily index peak of 100, Spain beat Argentina 1-0 in the World Cup final
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August 16, 2026 → The Defiant — daily index read 7
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June 11, 2026 → The Defiant — 2026 World Cup opened at Estadio Azteca
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August 17, 2026 → The Defiant — traders Goaty and ih8y posted their reads
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July 2026 → DefiLlama The Defiant — all-venue prediction-market volume hit a record $17.27 billion
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April 2026 → DefiLlama The Defiant — onchain prediction-market TVL peaked at $576.52 million
Search tracked the World Cup, then vanished
A trader who posts as Goaty called time on the prediction-market boom. “The global prediction market hype is over” Goaty said The search charts now confirm it, a verdict that landed the same day another trader, ih8y, shared mindshare numbers on August 17 The Defiant.
Google’s five-year high for the search term “prediction market” landed in the week of June 7-13, 2026 The Defiant, when worldwide interest hit an index score of 100. By the week of August 9-15, 2026 The Defiant it read 17 — 83% below that peak, essentially back to where it sat before the tournament.
The daily series shows what drove the collapse. It peaked at 100 on July 19, 2026 The Defiant, the day Spain beat Argentina 1-0 in the World Cup final, then fell to 7 on August 16, 2026 The Defiant. The 2026 World Cup opened June 11, 2026 The Defiant at Estadio Azteca, and interest rode the tournament almost the whole way down.
The trading floor tells another story
But the trading floor tells a different story than the search bar.
All-venue prediction-market volume reached a record $17.27 billion in July 2026 The Defiant, after $14.78 billion in June and $10.64 billion in May DefiLlama. So far in August the category has done $7.83 billion DefiLlama — a pace roughly 17% below July but still about a third above May.
Underneath the total, the two leaders are splitting. Kalshi set a record in July while Polymarket’s volume has roughly halved since June The Defiant, and Kalshi now takes about 77% of weekly volume to Polymarket’s 17% DefiLlama.
Where people talk, and where they trade
Yet on social mindshare the race looks far closer. A trader using the handle ih8y posted Moni analytics putting Polymarket at 21.57% of prediction-market mindshare against Kalshi’s 20.8% — a gap of less than a percentage point The Defiant.
The money parked onchain tells a third story. Category TVL peaked at $576.52 million in April 2026 The Defiant and has drained every month since, to about $404 million now DefiLlama. Research across 2.5 million wallets found 84% of Polymarket traders were losing money The Defiant.
The cooldown may be cyclical — search interest spiked around a single event and is now normalizing. But the split between where people talk and where they trade suggests the category’s next phase will be decided by a smaller, more serious crowd than the World Cup audience that briefly made prediction markets a household phrase, a surge that also reshaped internet traffic more broadly How the 2026 World Cup Reshaped Internet Traffic.
