Prediction Markets Hit $155B Volume, Solving 500-Year Liquidity Crisis

Woofun AI reports that prediction markets have evolved from niche historical experiments into a global information pricing infrastructure, with total trading volume surpassing $155 billion by mid-2026. This transformation marks the resolution of structural hurdles that persisted since the earliest recorded bets on the next pope in Rome in 1503. By 1916, Americans wagered approximately $211 million on U.S. presidential elections within New York's gambling markets, with election-related bet volumes occasionally exceeding stock trades on the Wall Street OTC Exchange.

Since the Renaissance, participants have attempted to assign prices to uncertain outcomes, yet a mature, viable market remained elusive until the emergence of Kalshi and Polymarket. These platforms enabled users to trade shares in future event outcomes, with transaction prices ranging from 0 to 1 dollar to reflect real-time probability assessments. Unlike traditional sports betting, positions can be opened or closed at any time as probabilities shift, allowing for markets on Federal Reserve interest rate decisions, Taylor Swift's Grammy wins, or the temperature in Paris on February 18th.

The academic foundations of modern prediction markets were laid in 1988, when Robin Hanson published early theories on information markets and conceptual futures. That same year, George Neumann, Forrest Nelson, and Robert Forsythe established the Iowa Electronic Markets (IEM) at the University of Iowa. Over five election cycles, IEM's predictions were accurate in 74% of cases, outperforming traditional polls and validating Friedrich Hayek's 1945 assertion that markets are the most efficient mechanism for aggregating collective wisdom.

Despite this early validation, the 2000s and 2010s witnessed numerous failures due to regulatory and operational constraints. In July 2003, the Policy Analysis Market, launched by DARPA and designed by Robin Hanson, was shut down after one day following accusations that it functioned as a betting market for assassination attempts. Congress also blocked the Hollywood Stock Exchange from becoming a real film futures exchange. Intrade operated in Dublin for over a decade before the CFTC sued it in 2012 for offering unregistered options to U.S. users, leading to its collapse in March 2013.

The crypto industry was initially viewed as a solution to these regulatory constraints, with the Ethereum Mainnet providing programmable, censorship-resistant infrastructure.

However, structural flaws emerged. Augur, launched in 2018, suffered from high Ethereum gas fees, resulting in a peak of only 265 users, which dropped to 37 within a month. Nick Whitaker and J. Zachary Mazlish analyzed these failures in their 2024 article "Works in Progress", identifying a lack of core participants: Savers, who seek long-term returns; Gamblers, who pursue excitement; and Professional Traders, who arbitrage mispriced opportunities. Prediction markets are zero-sum games, becoming negative-sum after fees, which deters Savers. Long settlement periods and niche topics fail to attract Gamblers, leaving Professional Traders without sufficient liquidity. This dynamic embodies the no-trading theorem, where rational actors refuse to act as counterparts without external subsidies, preventing the 'anything can be predicted' model from scaling.

Despite these structural challenges, prediction markets achieved a breakthrough during the 2024 U.S. presidential election, with probability estimates cited by The New York Times, CNBC, and Bloomberg terminals. Total funding for the sector exceeded $5 billion, with financing accelerating over the past 18 months. Polymarket and Kalshi now account for over 90% of industry trading volume, with monthly totals exceeding $58 billion. Polymarket was founded in 2020 by Shayne Coplan, a New York University alumnus who participated in Ethereum's ICO in 2014 and contacted Robin Hanson in 2019.

Launching from his Lower East Side apartment during the pandemic, Coplan leveraged Polygon, an Ethereum layer 2 network, to keep gas fees low. Settlements used PUSD, a stablecoin ensuring 1:1 payouts, while a hybrid order book combined off-chain matching speed with on-chain settlement reliability. This infrastructure allowed Polymarket to avoid the pitfalls of earlier crypto projects, achieving $26 million in monthly trading volume during the 2020 U.S. presidential election.

Polymarket's 'launch first, regulate later' strategy initially provided flexibility but led to regulatory conflicts. In January 2022, the CFTC fined Polymarket $1.4 million and ordered it to block U.S. users. The platform implemented geographic restrictions and hired a former CFTC chairman as an advisor, surviving the crypto winter with $73 million in trading volume in 2023. The 2024 U.S. presidential election became a highlight, with Polymarket generating $3.6 billion in election-related trading volume despite barring U.S. users. Its predictions of Trump's victory proved more accurate than polls.

A week after the election, the FBI raided Coplan's apartment to investigate potential circumvention of the 2022 ban. In July 2025, the DOJ and CFTC concluded their investigation without filing charges. Subsequently, Polymarket acquired QCEX, a CFTC-licensed exchange, for $112 million. In October 2025, Intercontinental Exchange, parent of the New York Stock Exchange, agreed to invest up to $2 billion in Polymarket at an $8 billion pre-investment valuation, becoming its global data distributor. Polymarket re-entered the U.S. market in December 2025. By July 2026, it had completed 707.7 million transactions with total trading volume exceeding $111.9 billion.

Kalshi adopted a compliance-first strategy from its inception in 2018, founded by MIT graduates Tarek Mansour and Luana Lopes Lara. Lara, a former professional ballet dancer who appeared in 'Swan Lake', transitioned to finance, while Mansour focused on regulatory approval. After nearly two years, the CFTC approved Kalshi as a designated contract market in November 2020, making it the first U.S. exchange to receive federal approval for event contract derivatives. This license provided a legal basis that superseded state gambling laws, allowing Kalshi to launch in July 2021.

However, strict KYC requirements and slow event listing processes hindered growth. The CFTC rejected Kalshi's application to launch a market for the 2024 U.S. presidential election, preventing participation in the industry's largest catalyst. Kalshi sued and won in September 2024, when a federal judge ruled that election contracts were not illegal gambling. Trading reopened only 32 days before the election, resulting in $500 million in volume compared to Polymarket's $3.6 billion.

Post-election, Kalshi's compliance credentials facilitated partnerships with Robinhood and integration into Bloomberg terminals. Between 2025 and 2026, Kalshi expanded into sports, leveraging marketing campaigns such as the 'Nicks sweep in four games' slogan during the NBA Finals and World Cup ads featuring Timothée Chalamet, Lionel Messi, and Luka Dončić. During the World Cup, 3 million users generated $27 billion in trading volume. By July 2026, Kalshi had completed 982.6 million transactions with total trading volume reaching $155.7 billion, surpassing Polymarket to become the industry leader. The platform's success demonstrated that regulatory compliance could unlock institutional adoption and mainstream marketing opportunities, transforming prediction markets from niche crypto experiments into mainstream financial products.

Widespread adoption followed, with exchanges and brokers launching prediction market services. Coinbase and Interactive Brokers adopted an aggregation model, integrating liquidity from multiple platforms, while CME Group built its own product from scratch. Robinhood followed a systematic path, routing orders to Kalshi before launching Rothera, a CFTC-regulated exchange, in June 2026. This strategy yielded $156 million in revenue in the second quarter of 2026, a 10-fold year-over-year increase, exceeding its $100 million revenue from crypto trading. The integration of prediction markets into traditional financial infrastructure signaled a shift from speculative betting to institutionalized information pricing, with major players recognizing the value of real-time probability data for hedging and investment decisions.

Woofun AI data shows that while Kalshi and Polymarket solved execution-level issues, deeper structural challenges identified by Whitaker and Mazlish remain partially unresolved. Gamblers are attracted to sports and crypto topics, with combination betting rising from 3% of Kalshi's volume in 2025 to 38% by July 2026. The sports market reached $120 billion in volume, and crypto predictions hit $22 billion. Political topics expanded beyond elections, with military and geopolitical conflicts generating $2.76 billion in volume. Professional traders entered the market, with Susquehanna becoming a market maker on Kalshi in 2024 and forming a joint venture with Robinhood. Jump Trading invested in both platforms, and Citadel is evaluating entry.

However, Savers remain absent, as prediction markets are zero-sum games, forfeiting potential returns from government bonds or other assets.

The next era for prediction markets will see them evolve from niche platforms into global information pricing infrastructure. New markets will give rise to mechanisms like Customized Hedging, allowing companies to manage risks associated with specific events. While the 'anything can be predicted' goal remains distant, the substantial progress in sports, crypto, and political categories demonstrates the viability of prediction markets as a core financial tool. The integration of regulatory compliance, crypto infrastructure, and institutional adoption has transformed a 500-year-old niche into a multi-billion-dollar industry, setting the stage for further innovation in information pricing and risk management.