Prediction markets have evolved from a quiet academic experiment at a public university in 1988 into a multi-billion-dollar industry that now sits at the intersection of finance, media, and politics. The road from the Iowa Electronic Markets to Kalshi’s CFTC-regulated event contracts is a story about forecasting accuracy, regulatory tug-of-war, and the stubborn insight that collective betting beats expert opinion more often than almost anyone expected.
This is the full history of prediction markets, how they got here, who built them, and why 2024 and 2025 finally pushed them into the mainstream.
1988: The Iowa Electronic Markets Begin
The modern prediction market was born at the University of Iowa in 1988, when economists and political scientists launched the Iowa Electronic Markets (IEM) as a teaching tool and research project. The CFTC granted the IEM a no-action letter, allowing small-stakes real-money trading on political outcomes, most famously the US presidential election. Position sizes were capped at $500, and the market was never allowed to turn a profit.
The results were striking. In election after election, the IEM’s final-day prices beat the leading opinion polls at predicting vote shares. By the late 1990s academic papers were piling up documenting the pattern: a few hundred traders putting their own money on the line produced forecasts that were harder to beat than Gallup or the networks.
2003 to 2012: Intrade and the First Mainstream Moment
If Iowa was the laboratory, Intrade was the stadium. Launched in Dublin in 2003, Intrade let traders anywhere in the world buy and sell binary contracts on everything from presidential elections to Supreme Court rulings to the recovery of Osama bin Laden. During the 2008 and 2012 US elections, Intrade’s odds became a daily feature on cable news. Nate Silver cited them. Economists wrote papers about them. For a brief moment, prediction markets looked ready for primetime.
Then came the enforcement wave. In November 2012 the CFTC sued Intrade for offering off-exchange commodity options to US customers. Within weeks the platform was shuttered. US traders lost access, account balances were frozen, and the first great experiment in retail prediction markets ended on a sour note. The regulatory question Intrade punted on — are event contracts gambling, securities, or something else entirely — would hang over the industry for the next decade.
2014 to 2020: Augur, PredictIt, and the Crypto Pivot
With Intrade gone, two very different projects stepped into the vacuum. PredictIt, operated by Victoria University of Wellington under a CFTC no-action letter, opened in 2014 as a research platform with $850 position caps and limited markets. It survived precisely because it looked more like Iowa than Intrade: small, academic, limited.
On the other end of the spectrum, Augur launched on Ethereum in 2018 as a fully decentralized prediction market. Traders could create any market they wanted. No KYC, no caps, no central operator to subpoena. The vision was prediction markets as a public utility, settled by token-weighted oracle voting. In practice Augur struggled with liquidity, assassination-market controversies, and the usability problems endemic to early DeFi. It proved the technology worked. It did not prove people would use it at scale.
| Platform | Launch | Model | Status |
|---|---|---|---|
| Iowa Electronic Markets | 1988 | Academic, CFTC no-action | Active |
| Intrade | 2003 | Offshore, binary | Shut down 2013 |
| PredictIt | 2014 | Academic, CFTC no-action | Winding down |
| Augur | 2018 | Decentralized, Ethereum | Low volume |
| Polymarket | 2020 | Decentralized, USDC on Polygon | Dominant offshore |
| Kalshi | 2021 | CFTC-regulated DCM | Dominant US |
2020 to 2022: Polymarket Takes Over the Internet
Polymarket launched in 2020 and quickly became the de facto global prediction market. By running on Polygon with USDC settlement, it combined crypto’s borderless nature with a user experience that actually felt like a trading app. Volume on the 2020 US election was substantial. Volume on the 2024 election was staggering: over $3.6 billion in trading activity, with the Trump-Harris market alone drawing more capital than most US political campaigns raised in individual states.
Polymarket’s rise was not without regulatory pain. In January 2022 the CFTC fined Polymarket $1.4 million for operating an unregistered swap execution facility, and the company geofenced US retail users. For four years Polymarket was the market everyone watched and most Americans could not legally use.
2021 to 2024: Kalshi Builds the Regulated US Alternative
While Polymarket was building offshore, Kalshi was building the opposite path. Founded by Tarek Mansour and Luana Lopes Lara, Kalshi received CFTC approval as a Designated Contract Market in 2020 and opened to US retail traders in 2021. Its contracts covered weather, economic data releases, tech milestones, and eventually sports and elections.
The election question was the fight. The CFTC blocked Kalshi’s political event contracts in 2023, Kalshi sued, and in October 2024 a federal court ruled in Kalshi’s favor. Days before the 2024 US presidential election, Kalshi launched regulated, legal political contracts for US retail traders for the first time in modern history. The dam broke. By 2026, Kalshi was processing hundreds of millions in weekly volume across politics, sports, crypto, and macro, with the full backing of the CFTC and partnerships extending to Robinhood and major fintech distribution.
2025 and 2026: The Mainstream Era
What changed in the past two years was not the technology or the math behind prediction markets. Both have been settled science for decades. What changed was institutional and cultural acceptance. ESPN prints Kalshi odds on NFL broadcasts. Bloomberg terminals ingest Polymarket data. The Federal Reserve publishes research citing event contract prices as a leading indicator for monetary policy expectations. The 2026 midterms are being tracked on prediction markets by every major news outlet, often ahead of polling.
The regulatory landscape has calmed, if not fully resolved. Kalshi operates under full CFTC oversight. Polymarket has returned to the US market following a 2025 settlement that allowed geofenced, verified US participation on a parallel compliant platform. PredictIt is in its managed wind-down. The decentralized experiments continue in the background, but the center of gravity has shifted decisively to regulated, high-liquidity venues.
Why This History Matters for Traders
The arc from Iowa to Kalshi tells you three things that still matter today. First, prediction markets have outperformed polls and expert panels across almost every major event they have been tested on for 35 years running. The accuracy edge is not a crypto-era story. It is a 1988 story. Second, regulation has been the industry’s bottleneck, not demand or technology. Every time a jurisdiction has opened a legal path, volume has followed within quarters, not years. Third, liquidity concentrates. Of the dozens of prediction market platforms launched since 2003, two now dominate: Kalshi in the US and Polymarket globally. If you are getting into the space, those are the two venues where price discovery actually happens.
For a side-by-side comparison of today’s top platforms, see our best prediction markets ranking. To start trading on the two names that defined this era, visit Kalshi for US-regulated contracts or Polymarket for the deepest global liquidity.