Prediction Markets Go Mainstream as Polymarket Monthly Volume Tops $25 Billion

Kalshi and Polymarket allow traders to buy contracts tied to outcomes in politics, sports and other real-world events, with prices serving as market-implied probabilities. Their growing scale underscores prediction markets’ shift from niche wagering products toward a broader financial and consumer category, drawing closer scrutiny of liquidity, market structure and regulation as more users and capital enter the sector.

Combined trading volume at Kalshi and Polymarket exceeded $50.6 billion in July 2026, setting a monthly record as World Cup-related contracts helped drive activity. Polymarket’s US market posted a 54% increase from June, while volume on its main platform fell 26% over the same period. The divergence suggests that fresh demand was concentrated in the regulated US offering and major sports events rather than spread evenly across Polymarket’s operations.

Polymarket allows traders to use crypto assets to wager on outcomes ranging from elections to economic events, with contract prices often treated as real-time measures of collective expectations. The decentralized prediction market relies heavily on transparent blockchain records and wallet activity to establish credibility, making signs of trading on nonpublic information or coordinated bets a significant test of market integrity and a potential focus for regulators.

A Bloomberg Businessweek analysis flagged about $200 million of Polymarket trading during the first half as potentially linked to insider activity. The top 1% of profitable accounts captured more than half of all gains, while over 50% of winning wallets were created within 24 hours before placing their bets. Some traders also appeared to split positions across multiple related wallets before withdrawing proceeds through Coinbase, intensifying scrutiny of the platform’s fairness.

Prediction markets allow users to trade contracts tied to the outcomes of sporting, political and other events, with prices reflecting the market-implied probability of each result. Betting demand generated by the 2026 FIFA World Cup rapidly expanded Kalshi and Polymarket, bringing greater scrutiny to their liquidity, compliance and regulatory disputes across U.S. states.

Kalshi and Polymarket recorded a combined $44.8 billion in trading volume in June 2026, up 75% from May. Kalshi's monthly volume surged 87.4% to a platform record. Polymarket also returned to growth, supported by World Cup enthusiasm and U.S. market demand, though both companies continued to face regulatory challenges from several U.S. state governments.

Polymarket is a prediction-market platform where users trade on the outcomes of political, economic and public events. It has expanded its regulated U.S. operations in recent years. The revenue surge could help support its pursuit of a $15 billion valuation and intensify its competition with regulated rival Kalshi.

By the sixth week after the launch of its U.S. exchange, Polymarket’s projected annualized revenue had exceeded $1 billion, indicating that the new market quickly boosted trading and fee income. Although reports did not disclose the exact launch date or weekly revenue, the milestone has become an important indicator of prediction markets’ accelerating move into the mainstream.

Polymarket and Kalshi are prediction-market platforms that let users trade contracts based on the outcomes of political, economic and other events. Their cumulative trading volume has surpassed $150 billion, underscoring the sector's emergence as a major fintech segment. Kalshi has taken the lead in the U.S. market with authorization from the Commodity Futures Trading Commission.

Polymarket and Kalshi recorded a combined $21.9 billion in monthly trading volume in April 2026, an all-time high. However, Polymarket's monthly volume fell for the first time since August 2025, allowing Kalshi to overtake it in scale. Polymarket has also partnered with Chainalysis to strengthen compliance as it continues seeking to reopen trading to U.S. users.

Prediction markets such as Polymarket and Kalshi allow users to trade contracts tied to the outcomes of elections, wars and policy decisions, with prices reflecting the crowd's assessment of an event's probability. The integration of blockchain technology, cryptocurrencies and stablecoins has improved cross-border trading and settlement efficiency, making prediction markets an increasingly important fintech use case.

Geopolitical betting and media attention drove prediction market volume higher in March this year. Preliminary estimates put volume at about $23.7 billion, while subsequent monthly data revised the figure up to $25.7 billion, with both readings marking all-time highs. Transaction counts surged more than 2,800% from March last year, showing that activity has expanded beyond one-off major events into more sustained trading on political and international issues.

Polymarket is a prediction market where participants use crypto assets to bet on the outcomes of political, economic and other events. As the platform’s influence and trading volume have grown, scrutiny has intensified over whether users generally make money. Bloomberg examined wallet data and found returns were highly concentrated, suggesting a small group of whales may dominate liquidity and the distribution of profits.

Bloomberg’s analysis of active Polymarket wallets since the beginning of 2025 found that more than 100,000 wallets had each lost at least $1,000. Just 5% of wallets generated 75% of trading volume, while fewer than 1% captured about half of all profits. Most gains flowed to a small number of the highest-volume accounts. The number of wallets does not necessarily equal the number of actual users.

Polymarket is an onchain prediction market built on Polygon where users trade on the outcomes of political, economic, technology and other events. The platform generates revenue from trading fees. Its revenue surge suggests prediction markets may become a sustainable crypto finance business rather than relying solely on election-driven interest, though regulatory pressure in the United States, Europe and Argentina remains a major risk.

On March 30, 2026, Polymarket expanded taker fees beyond crypto and sports to markets covering finance, politics, economics, culture, weather and technology. DeFiLlama data showed daily fees rising from about $363,000 to more than $1 million on both April 1 and April 2, putting the early annualized estimate at about $338 million. Fees totaled $7.1 million in the first week of the second quarter, accounting for 96.8% of all onchain prediction-market fees.

Prediction markets allow participants to wager on the outcomes of political, economic and public events, with prices reflecting the crowd’s assessment of their probabilities. As crypto assets and on-chain settlement expand, these platforms are emerging as a new gauge of market expectations. Polymarket’s lead also underscores the impact of liquidity and pricing power becoming concentrated on a small number of platforms.

An OKX Ventures report said global prediction market open interest topped $1 billion for the first time in February 2026, while total trading volume reached $18.7 billion. Polymarket remained firmly in the lead with a 55% market share. However, capital was heavily concentrated in popular events, while retail sentiment created a clear pricing premium, showing that market efficiency and depth remain uneven despite rapid growth.

Polymarket is a prediction-market platform where users trade probabilities based on event outcomes, and it has gradually expanded its range of crypto-asset contracts in recent years. These products do not involve buying or selling Bitcoin directly. Instead, users bet on whether its price will rise or fall over a brief period. The rapid influx of money into ultra-short-duration markets shows speculative activity spreading from traditional cryptocurrency exchanges to prediction markets.

As of July 20, 2026, daily trading volume in Polymarket's 5-minute and 15-minute Bitcoin price bets had surged to $60 million, making them among the platform's most active markets. Volume remained below that of major cryptocurrency exchanges, but the rapid buildup in turnover for short-duration contracts underscored strong market interest.