CryptoSlate
South Korean police opened the country's first illegal gambling probe into domestic Polymarket users on Jun. 5, targeting residents who placed bets on the Jun. 3 local election outcomes. The Gangwon Provincial Police Agency is leading the investigation at the request of the National Police Agency, tracing cryptocurrency transaction records to identify users nationwide. Those identified face potential fines of up to 10 million won ($6,500) under Article 246 of the Criminal Act. Polymarket's resolved 2026 Seoul mayoral election market alone showed $52.2 million in volume, putting activity well into the tens of billions of won across Korean election markets.
The probe is the latest data point in a broader pattern: six of the top 20 markets on Chainalysis' 2025 Global Crypto Adoption Index have now moved against prediction platforms through gambling law, derivatives restrictions, ISP blocks, user enforcement, or some combination. South Korea ranks 15th on that list, joining India (#1), Brazil (#5), Indonesia (#7), and Thailand (#17).
Why it matters
Crypto adoption and legal permission for crypto-native financial products are diverging, and prediction markets are caught in the gap. Combined monthly trading volume on Kalshi and Polymarket climbed from under $5 billion in September 2025 to over $10 billion in May 2026 — within striking distance of the $14 billion monthly average run by legal US sportsbooks. Sports, politics, and crypto drove 91% of Kalshi's global volume and 90% of Polymarket's since July 2024, and those are precisely the product categories regulators target first.
South Korea's move also signals a shift in enforcement logic: from platform blocking to user liability. Authorities are tracing on-chain transaction records to summon individuals, the same playbook India has run with MeitY blocking orders and VPN-provider warnings, and Thailand has run through its cybercrime classification of Polymarket as illegal online gambling.
Market impact
The squeeze has already cost the industry concrete product surface. Brazil's National Monetary Council Resolution No. 5,298 blocked 27 platforms including Polymarket, Kalshi, PredictIt, and Robinhood's forecasting feature, and prohibited derivatives tied to sports, politics, elections, cultural, and social outcomes — only contracts tied to economic benchmarks survived. Kalshi's XP International distribution partnership in Brazil was undercut a month later.
Frequently asked questions
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What did South Korea's police do against Polymarket users on Jun. 5?
The Gangwon Provincial Police Agency opened the country's first illegal gambling probe into domestic Polymarket users who bet on the Jun. 3 local election outcomes, tracing crypto transaction records to identify individuals nationwide. Those caught face fines up to 10 million won (~$6,500) under Article 246 of the…
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How many top crypto adoption markets have moved against prediction platforms?
Six of the top 20 markets on Chainalysis' 2025 Global Crypto Adoption Index have taken action against prediction platforms: India (#1), the US (#2), Brazil (#5), Indonesia (#7), South Korea (#15), and Thailand (#17) — through gambling laws, derivatives restrictions, ISP blocks, or user enforcement.
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Why are regulators targeting prediction markets specifically?
Sports, politics, and crypto drove 91% of Kalshi's global volume and 90% of Polymarket's since July 2024. Those are the product categories regulators treat as gambling or restricted derivatives, and platforms cannot strip them out without becoming structurally different businesses.
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How big are Kalshi and Polymarket's trading volumes?
Combined monthly trading volume on Kalshi and Polymarket climbed from under $5 billion in September 2025 to over $10 billion in May 2026, compared with about $14 billion in average monthly wagers at legal US sportsbooks throughout 2025.
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What is the bull case for prediction markets under regulation?
In the bull case, regulators in major financial centers accept event contracts as legitimate derivatives when used for economic, financial, or hedging purposes, and require platforms to strip out sports, politics, and elections. Kalshi's CFTC-regulated model would serve as the template, with platforms bifurcating into…
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