If you have spent any time following US sports or political betting over the past year or two, you will have come across the term “prediction markets.” They have been generating huge amounts of money across the Atlantic, with billions of dollars changing hands on everything from election outcomes to World Cup winners. But what exactly are they, and should UK bettors be paying attention?
The short answer is yes. Prediction markets work differently to traditional bookmakers, and understanding how they operate could change the way you think about odds and value.
What Are Prediction Markets?
A prediction market is a platform where people trade contracts based on the outcome of real-world events. Instead of placing a bet with a bookmaker who sets the odds, you buy and sell shares (often called contracts) that pay out if a specific outcome happens.
Think of it like a cross between a betting exchange and a stock market. Each contract trades between 0 and 100 cents. If you buy a “yes” contract at 30 cents and the outcome happens, it settles at $1.00 and you pocket 70 cents profit. If it does not happen, you lose your 30 cents.
The price of a contract reflects the crowd’s estimate of probability. A contract trading at 63 cents means the market collectively believes there is a 63% chance of that event occurring. This is where things get interesting for anyone used to reading traditional fractional or decimal odds.
How Do They Differ From a Traditional Bookie?
With a standard bookmaker, the company sets the odds and builds in a margin. You are betting against the house, and the house always has an edge baked into the pricing. That margin is how they make their money, and it is why odds comparisons between bookies are so important.
Prediction markets flip this. You are trading against other users, not against the platform. The platform takes a small commission on winning trades (often around 1-2%), but there is no built-in overround in the same way there is with a bookmaker. This means the pricing tends to be sharper, which is why serious bettors and professional traders have been drawn to them.
There is another key difference too. With a traditional bet, your money is locked in until the event finishes. On a prediction market, you can sell your position at any point before settlement. If you bought a contract at 15 cents and it rises to 40 cents because sentiment has shifted, you can sell for a profit without waiting for the result. It works much like the cash out feature that most bookmakers offer, except the pricing is driven by other traders rather than the bookmaker’s algorithm.
What Can You Trade On?
The range of markets is broader than you might expect. Sports are a big chunk of the action. The 2026 World Cup winner market has already attracted millions of dollars in volume, with Spain, England and Argentina sitting at the top. Premier League and Champions League markets are active too.
Politics is another major category. The 2028 US Presidential Election has generated significant trading activity, and individual policy decisions like Federal Reserve interest rate calls are among the most heavily traded contracts on any platform.
Then there are the more unusual markets. People trade on crypto prices, whether specific tweets will be posted, cultural events and even some truly left-field propositions. If there is a measurable outcome, someone has probably created a market for it.
According to the DeFi Rate prediction markets tracker, which monitors live volume across the main platforms, weekly trading volume recently hit $4.4 billion. That is not a niche corner of the betting world any more.
Which Platforms Are People Using?
The two biggest names are Kalshi and Polymarket. Kalshi is regulated by the US Commodity Futures Trading Commission (CFTC), which gives it a more traditional regulatory framework. Polymarket operates as a decentralised platform built on blockchain technology.
Both platforms list many of the same events, which creates price differences between them. Sharp traders watch for these gaps and trade on both platforms to lock in profit, much like arbitrage strategies work in traditional sports betting.
Newer entrants like DraftKings Predictions and Robinhood have also moved into the space, bringing prediction markets closer to the mainstream sports betting audience.
Are Prediction Markets Available in the UK?
This is the tricky part. The major prediction market platforms are primarily aimed at US users. Polymarket is accessible from the UK, but it operates in a regulatory grey area since it is not licensed by the UK Gambling Commission. Kalshi is US-only for the time being.
UK punters who want a similar experience are better served by betting exchanges, which work on a broadly similar principle of peer-to-peer trading. Betfair, for example, lets you back and lay outcomes against other users. The mechanics differ (exchanges use traditional odds rather than contract pricing), but the core idea of trading against other users rather than against the house is the same.
The CFTC’s guidance on event contracts provides a useful overview of how prediction markets are regulated in the US.
What Can UK Bettors Learn From This?
Even if you never trade on a prediction market yourself, the real-time probability data they generate is a useful tool for gauging market sentiment on sporting events.
If a prediction market prices England at 13% to win the World Cup while your bookmaker has them at 8/1 (which implies roughly 11%), that gap tells you something. Either the prediction market crowd is too bullish on England, or your bookie is offering decent value. Either way, it gives you another data point.
Prediction markets also react faster to breaking news than traditional bookmakers. If a key player picks up an injury in training, the contract price on that team often shifts within minutes. Bookmakers might take longer to move their odds, which occasionally creates short windows of value.
A Different Way to Think About Odds
Prediction markets are not about to replace your local Ladbrokes or your Betfair account. But they represent a shift in how people engage with event-based trading, and the volume of money involved suggests they are here to stay.
Whether you use them to inform your traditional bets or eventually trade on the platforms directly, keeping an eye on this space is worth your time.