Prediction markets moved $63.5 billion in 2025, up from $15.8 billion the year before. That number is almost quaint compared to where the industry is headed — analysts project $200 billion to $325 billion in 2026 volume. But the mechanism behind that money, letting people bet real cash on real-world outcomes and calling it a market instead of a wager, is nearly 40 years old.
The evolution of prediction markets is a story about regulators chasing innovation, retail traders chasing edge, and a handful of academics who built something in a University of Iowa classroom that eventually became a tool ICE invested $2 billion into. Understanding that arc explains why Polymarket and Kalshi look the way they do today, why the CFTC keeps changing its mind, and why the next 12 months will look nothing like the last decade.
This guide walks through every major era: the academic origin story, the Intrade boom and collapse, the crypto reboot, and the regulatory breakthrough that turned prediction markets into a mainstream financial product. If you want the mechanics of how these markets actually price outcomes, see our companion piece on how prediction markets work.
The Iowa Electronic Markets and the Academic Origins (1988-2000)
The first modern prediction market launched in 1988 at the University of Iowa's business school. Economists built the Iowa Electronic Markets (IEM) to test a simple hypothesis: that a market made of real money traders would forecast presidential election outcomes more accurately than polls. It worked. Across multiple election cycles, IEM's vote-share contracts consistently beat national polling averages, and the CFTC granted it a no-action letter allowing small-stakes trading for academic research.
IEM never scaled beyond a few thousand dollars in contract value per election. Trades were capped at $500 per account, and the entire operation existed to generate research papers, not revenue. But it proved the core thesis that still drives every platform today: aggregated financial incentives produce better forecasts than expert opinion or survey data. That single finding is the intellectual foundation everything else in this article builds on.
Intrade and the First Retail Boom (2001-2013)
Intrade, founded in Ireland in 2001, took the Iowa concept and removed the guardrails. No $500 cap, no academic oversight, and contracts on everything from elections to Saddam Hussein's capture to Oscar winners. By the 2008 and 2012 US presidential elections, Intrade was moving tens of millions of dollars and getting cited on CNN and in the Wall Street Journal as a real-time probability tracker.
Intrade's downfall previewed every regulatory fight the industry still has today. The CFTC sued Intrade in 2012 for offering off-exchange commodity options to US residents without registration. Intrade blocked US customers in 2013, then collapsed entirely in early 2014 after auditors discovered a shortfall in customer funds — a solvency scandal, not a regulatory one. The lesson that survived: unregulated offshore prediction markets can build real liquidity, but they carry real counterparty risk. That tension between innovation speed and regulatory legitimacy still defines the legal status of prediction markets in the US in 2026.
The Crypto Reboot: Augur, PredictIt, and the DeFi Experiment (2014-2019)
Intrade's collapse left a vacuum, and two very different projects filled it. PredictIt launched in 2014 as a nonprofit-adjacent academic platform under a CFTC no-action letter, capping trades at $850 per contract per market and restricting it to political and current-events contracts. It became the go-to political forecasting tool for journalists and academics for the next decade, until the CFTC moved to revoke its no-action letter in 2022 — a fight that dragged into 2023 before PredictIt survived with a smaller scope.
Augur, launched in 2018 on Ethereum, took the opposite approach: fully decentralized, no company to sue, no KYC, resolution handled by token-holder consensus instead of a corporate oracle. It proved that prediction markets could run entirely on-chain, but Augur never solved the liquidity problem. Thin order books and slow, disputable resolution made it a proof of concept rather than a product traders actually used at scale. It matters historically because Polymarket's entire architecture — on-chain settlement, off-chain order matching, a separate oracle for resolution — is a direct response to what Augur got wrong.
Polymarket, Kalshi, and the Regulatory Breakthrough (2020-2024)
Polymarket launched in 2020 on Polygon, settling trades in USDC and using an optimistic oracle (UMA) for dispute resolution instead of pure token voting. It grew slowly through 2020 and 2021, then exploded during the 2024 US presidential election, when its election market became the most-watched forecast of the race. Monthly trading peaked at over $3 billion, and major media outlets began citing Polymarket odds as a real-time gauge of the campaign. It did all of this while officially closed to Americans: in January 2022 Polymarket had settled with the CFTC for $1.4 million over unregistered event contracts and agreed to block US users.
Kalshi took the slow road through the front door. In November 2020 the CFTC designated it as a contract market — the first federally regulated exchange built specifically for event contracts. Its early catalog was deliberately narrow: economic data, weather and a handful of current events. When it tried to list contracts on which party would control Congress, the CFTC disapproved them in September 2023 under its public-interest rule. Kalshi sued, and in September 2024 a federal court ruled in its favour. Election contracts went live that October, weeks before the vote — the first time Americans could legally trade on a US election at scale on a regulated exchange.
Those two paths, one offshore and crypto-native, one onshore and regulated, defined the industry's structure. Our Polymarket vs Kalshi comparison covers how they differ today.
Sports, Brokerages, and the Mainstream Era (2025-2026)
The 2024 election proved the demand. 2025 proved the business. In January 2025 Kalshi began listing sports event contracts, and within a year sports had become the dominant category, at more than 80% of all prediction market volume. In May 2025 the CFTC dropped its appeal in the Kalshi case, effectively settling election contracts at the federal level. Industry volume went from $15.8 billion in 2024 to $63.5 billion in 2025.
Capital followed. Polymarket acquired QCEX, a CFTC-licensed exchange, for $112 million to rebuild a legal route to US users, and Intercontinental Exchange — the owner of the New York Stock Exchange — committed up to $2 billion. Kalshi raised money at an $11 billion valuation in December 2025. Distribution followed the capital: Robinhood, which added event contracts in late 2024, put them in front of millions of brokerage customers; DraftKings Predictions launched in November 2025; FanDuel and Crypto.com's OG followed in early 2026; and Gibraltar licensed PredictStreet as Europe's first regulated prediction market.
The backlash arrived on the same schedule. Nevada, Massachusetts, Maryland and Ohio moved against sports event contracts; Arizona filed criminal charges against Kalshi in March 2026; and that same month Senators Adam Schiff and John Curtis introduced the Prediction Markets Are Gambling Act, which would treat event contracts as gambling rather than derivatives. Our explainer on CFTC prediction market regulation walks through each step of that fight.
What 38 Years of Prediction Markets Teach
Four lessons repeat across every era.
The core thesis holds. The Iowa economists were right: markets with money at stake forecast well. Today's leading platforms post Brier scores around 0.09, and our analysis of how accurate prediction markets are explains what that means in practice.
Liquidity decides who survives. Augur had the purer design and lost; Polymarket had the deeper books and won. Every platform launched since 2020 has been judged on whether people actually trade on it.
Counterparty risk is real. Intrade did not die because regulators shut it down — it died because customer money was missing. That is the strongest argument for regulated exchanges with segregated customer funds.
Regulation always arrives. Every platform that grew large enough ended up negotiating with the CFTC, whether by settling, suing or buying a license.
What Comes Next
The next phase will be decided in courtrooms and in Congress rather than in product launches. If federal preemption holds, prediction markets become a national financial product competing directly with sportsbooks. If the states win, or the Schiff-Curtis bill passes, sports contracts fall under state gaming law and the map fragments. Either way, the infrastructure is no longer experimental: institutional money, brokerage distribution and automated trading — covered in our piece on AI trading bots in prediction markets — are already here. Analysts project $200 billion to $325 billion in volume for 2026, more than three times the 2025 total.
Frequently Asked Questions
What was the first prediction market?
The Iowa Electronic Markets, launched in 1988 at the University of Iowa, is the first modern prediction market. It ran small real-money markets on elections under a CFTC no-action letter, with accounts capped at $500.
Why did Intrade shut down?
Intrade blocked US customers in 2013 after the CFTC sued it in 2012, and it collapsed in early 2014 after auditors found a shortfall in customer funds.
When did Kalshi start offering election contracts?
In October 2024, after a federal court ruled in Kalshi's favour in September 2024. The CFTC dropped its appeal in May 2025.
How big is the prediction market industry?
Prediction markets traded $63.5 billion in 2025, up from $15.8 billion in 2024, and analysts project $200 billion to $325 billion for 2026.
Are prediction markets legal in the US?
Federally regulated exchanges like Kalshi operate in most states, but several states are contesting sports event contracts and Congress is debating the Schiff-Curtis bill. See our guide to whether prediction markets are legal in the US.
