Prediction markets volume jumps 75% to $45B

TLDR

Prediction markets handled about $45 billion in trades in June, up roughly 75% month on month, with sports and macro bets driving a major liquidity step-up.

1. Combined volume on Kalshi and Polymarket jumped to around $44.8 billion in June, from $25.66 billion in May, largely powered by FIFA World Cup contracts.
2. This surge shows event markets becoming a serious venue for capital and data, with crypto-native platforms like Polymarket and Solanas World tying the trend directly into DeFi.
3. Sustainability depends on how legal scrutiny and new products (onchain markets, ETFs, perps) evolve, so watching regulation and non-sports volumes is key.

Deep Dive

1. What Drove The 75% Jump

According to data summarized by The Block, Kalshi, Polymarket, and Polymarket US recorded about $44.8 billion in June volume, up 75% from $25.66 billion in May.

Kalshi grew fastest, climbing 87.4% to $31.5 billion, while Polymarkets main platform reached $10.26 billion and its U.S. arm $3.04 billion. The single biggest driver was the 2026 FIFA World Cup, where Kalshis winner market alone attracted over $832 million and per-match markets on Polymarket drew $500,000 to $2 million each.

Beyond sports, traders also concentrated in macro and rate-hike markets, with Fed-related contracts seeing millions in volume as participants priced odds on future policy moves.

2. Why It Matters For Crypto And DeFi

Polymarket is a crypto-native venue, settling markets onchain and now expanding across Polygon and Solana, while Solana-based protocol World just launched inside Phantom wallet with Chainlink-powered oracles. That ties prediction volumes directly into DeFi liquidity, stablecoins and DEX flows.

Sector open interest hit a record $1.48 billion in June, and major exchanges like LBank and Robinhood are adding event-driven prediction products, suggesting prediction markets could rival or complement spot crypto trading revenue. For crypto users, these platforms are both:

1. new ways to express views on macro, politics and sports using stablecoins, and
2. a rich real-time signal source for probabilities that can inform broader positioning.

3. Sustainability, Risks, And What To Watch

Regulatory pressure is rising. Multiple U.S. states are pursuing legal action over sports-related contracts, while federal regulators debate how far event markets can go. The SEC has opened a comment window on novel ETFs, including prediction-market funds, which will shape institutional access.

At the same time, analysis of Polymarket order books shows many individual markets remain thin, with most contracts under $10,000 in volume and bots dominating shallow markets, which can increase volatility and execution risk for smaller traders.

Key things to watch next: whether non-sports markets (elections, rates, macro data) keep scaling, whether onchain platforms like World publish credible volume and liquidity figures, and how upcoming rule changes from CFTC/SEC affect which contracts remain tradable.

Conclusion

Prediction markets jumping about 75% to roughly $45 billion in monthly volume marks a clear acceleration in event-based trading, with sports acting as the catalyst and macro odds providing depth.

For crypto, the important shift is that a growing slice of this activity now settles onchain, feeding DeFi rails and creating a new, probabilistic data layer that traders and builders can plug into. How regulators, liquidity and non-sports markets evolve will determine whether this is a one-off World Cup spike or the start of a durable new pillar in the crypto market structure.