Prediction Markets Started in a Bar in 1988, Now You Can Bet on Wildfires
In 1988, three University of Iowa economists – Robert Forsythe, George Neumann and Forrest Nelson – were at a bar called the Airliner, annoyed that pollsters had completely missed Jesse Jackson’s upset win in the Michigan Democratic caucus. Their question was simple: could a market do better than a poll?
They built what they called the Iowa Political Stock Market, a few hundred university staff trading contracts on the 1988 Bush-Dukakis race, capped at $500 a person. It correctly forecast Bush’s vote share within a fraction of a percentage point. Between 1988 and 2004, what became the Iowa Electronic Markets beat traditional polling 74% of the time.
That’s the actual origin of the thing now moving billions of dollars a month: not a Silicon Valley pitch deck, but three academics testing whether the “wisdom of crowds” got sharper when real money was on the line.
From an academic experiment to a $40 billion industry
The idea sat mostly dormant for two decades – a few political-science curiosities, an early 2000s platform called Intrade that eventually collapsed under regulatory pressure. Then crypto infrastructure gave it a second life. Polymarket and Kalshi turned “trade a contract on whether X happens” into a mainstream consumer product, and the numbers exploded: combined volume passed $40 billion in 2025, and more than $5.6 billion was wagered on this year’s World Cup final alone, through prediction markets, not sportsbooks.
That scale is exactly why Netflix’s rapid-turnaround documentary series Instadocs made its second-ever episode about this specific topic, The Prediction Games, released July 26, 2026, just a week after that World Cup final. It’s a genuinely well-sourced piece, with interviews from both Polymarket’s Shayne Coplan and Kalshi’s Tarek Mansour, and it landed controversially: Kalshi sent Netflix a cease-and-desist over the trailer before the documentary had even aired, calling it “defamatory” – which, if nothing else, tells you how high the stakes around these platforms have become.
The uncomfortable question the documentary actually asks
The film’s real thesis isn’t “gambling is exploding”, it’s the question posed by journalist James Surowiecki in the documentary: has the existence of these markets started changing the reality they’re supposed to be predicting?
He lays out three specific risk categories:
- Insider trading: trading on non-public information to front-run a market’s outcome
- Gaming the system: directly tampering with whatever data source settles the contract
- Altering reality itself: where the existence of the market itself changes what people actually do
That third one is the one that warrants immediate scrutiny. If enough money is riding on a “yes/no” outcome, you don’t need to hack anything, you just need to make the outcome happen. The documentary points to something as trivial-sounding as hackers manipulating Spotify streams to move a financial outcome. Scale that logic up and the implications get genuinely dark fast: a large enough weather-outcome contract creates a real financial incentive for someone, somewhere, to interfere with the thing being predicted, whether that’s a controlled burn that gets deliberately mishandled, or something far worse.
OddsMint take: this is precisely why “how do you regulate this” doesn’t have a clean answer yet. Traditional sports betting has one advantage prediction markets don’t: the outcome (who wins a match) is extremely hard for any single bettor to influence, and leagues have decades of integrity infrastructure built around the few who try. Prediction markets can be built on literally anything measurable – election results, weather, box office numbers, celebrity gossip – and most of those outcomes have no equivalent integrity infrastructure at all. Nobody’s watching for match-fixing on “will it rain in Phoenix on Tuesday.”
How to Actually Trade a Prediction Market (Not the Basics)
If you’ve only ever placed fixed-odds bets, the mental model needs to shift before the mechanics will make sense, this isn’t “pick a side, take the price.” It’s closer to trading a financial instrument that happens to settle on a real-world outcome.
1. The contract price is the probability, not the odds
A yes/no contract trades somewhere between 0 and 100 (or £0.00–£1.00, depending on the platform’s convention). If “Manchester City win the Premier League” trades at 62, the market is pricing a 62% implied probability – not 62p returning some multiple. Buy at 62 and hold to settlement: if it resolves YES, you’re paid 100; if NO, you get 0. Your profit is the gap between what you paid and 100, not a bookmaker’s payout multiplier. This is the single biggest adjustment for anyone coming from fixed-odds betting – you’re pricing probability directly, not backing into it through decimal odds.
2. You can exit before settlement – and that’s where the actual skill lives
Unlike a traditional bet, you’re not locked in until the final whistle. If you buy YES at 40 and news moves the market to 70 before the event resolves, you can sell your position and take the 30-point gain immediately, without needing the outcome to actually happen yet. This turns event-trading into something closer to short-term position management than a single win/lose wager, you’re managing exposure across the life of the contract, not just picking a winner and waiting.
3. Spread and liquidity matter more than they do in fixed-odds betting
Every contract has a bid (what buyers will pay) and an ask (what sellers want) – the gap between them is the spread, and it’s your real transaction cost, distinct from the platform’s commission. Thin markets (a niche event, a contract with few active traders) can have wide spreads that quietly eat into any edge you think you have. Before committing size to a position, check the order book depth, not just the last traded price, a contract that “last traded at 55” might have almost no volume actually available at that level.
4. Settlement source is the whole game
Every contract specifies exactly what data source resolves it, an official result feed, a named index, a specific reporting body. Read this before trading, not after. This is precisely the “gaming the system” risk category we covered above: a contract with a vague or manipulable settlement source is a structurally weaker bet than one tied to something like an official sporting result or a government statistical release, regardless of how the price looks.
5. Position sizing works differently because you can average in and out
Because you’re not locked into a single stake at a single price, disciplined traders build positions incrementally, entering partial size early, adding as conviction firms up, trimming if the price moves against the initial thesis. Treating a prediction market position like a single fixed-odds stake (all in, at one moment, held to the end) throws away the actual structural advantage this format offers over traditional betting.
Where to actually do this – prediction markets UK
Given everything above about UK regulatory positioning, there are currently two ways to access this in a genuinely regulated UK market: Matchbook Predictions, launched January 2026 as one of the first dedicated, UKGC-licensed yes/no contract products in the UK, and EasyBet Predictions, a joint venture between easyGroup and Matchbook that runs on that same underlying exchange infrastructure. Same markets, same mechanics, different brand and interface, pick whichever fits your existing account or preference.
Either way, you’re getting a genuinely different proposition from using Polymarket or Kalshi through a workaround with no UK consumer protection behind it which means ring-fenced funds, a formal complaints process, GamStop coverage, the entire protective infrastructure that’s simply absent if you’re trading through a crypto wallet on an offshore platform.
▶️ Explore prediction markets at Matchbook → | ▶️ Explore prediction markets at EasyBet →
18+. Bet responsibly. OddsMint may receive a commission if you register via links on this page.
1. What is a prediction market and how does it work?
A prediction market is a peer-to-peer trading platform where users buy and sell contracts based on the outcomes of future real-world events. Instead of traditional fixed bookmaker odds, these markets display outcomes as percentage-based "Yes/No" probabilities (from 0% to 100%). As collective information and public opinion shift, contract prices fluctuate in real time, converting crowd knowledge into an accurate forecasting tool.
2. How do prediction markets differ from traditional sports betting?
Unlike standard sportsbooks where you bet directly against the house, prediction markets function like a financial exchange.
Peer-to-Peer: You are always trading against other real users who hold the opposing view.
Trading Flexibility: You do not have to lock in a bet until the final whistle. You can buy a "Yes" contract early and sell it later for a quick profit if the probability rises before the event even ends.
Better Value: Because there is no bookmaker margin or "juice" baked into the lines, users generally benefit from significantly better odds and market-driven pricing.
3. Are prediction markets legal and regulated in the UK?
Yes, but they are uniquely categorised compared to other regions. While countries like the US regulate them as financial derivatives, the UK Gambling Commission (UKGC) treats prediction markets as "Betting Intermediaries". This means standalone, purpose-built US platforms (like Polymarket or Kalshi) are often geoblocked in Europe. However, British users can legally trade prediction markets via platform operators holding a valid UKGC betting exchange licence.
4. Where can I trade prediction markets legally in the UK?
The infrastructure driving UK prediction markets is powered heavily by established exchange technology. Two of the premier, licensed platforms available for British traders include:
Matchbook Prediction Markets: Historically a major sports betting exchange, Matchbook launched a dedicated US-style prediction market platform featuring clean percentage-probability interfaces rather than fractional odds. They are heavily focused on sports event contracts, including comprehensive coverage of global football tournaments.
easyBet Predictions: Backed by the famous "easy" brand group (the masterminds behind easyJet), easyBet offers a white-label prediction product running directly on Matchbook's secure exchange infrastructure. It provides a user-friendly, consumer-focused environment to trade "Yes/No" outcomes on trending daily topics in sports, culture, and politics.
