Prediction Markets vs Sports Betting — What's the Difference?
Understand the key differences between prediction markets and sports betting — structure, regulation, odds formats, and which is better for different goals.
Prediction markets and sports betting both involve staking money on uncertain future outcomes. But they are structurally very different — and understanding that difference helps you choose the right tool for your goals.
The Core Difference: Variable vs Fixed Odds
The most important structural difference is how prices are set:
- Sports betting (bookmakers): A bookmaker sets odds. If you bet on a team at 2.0 (evens), you get exactly $2.00 back per $1.00 staked, regardless of what happens later. The odds are fixed at the time you place your bet.
- Prediction markets: Prices are set by supply and demand from all traders. A contract might start at 50¢ (50%) and move to 75¢ (75%) as new information arrives. You can buy or sell at any time before resolution.
This makes prediction markets more like stock markets than traditional bookmakers. Prices continuously update, and your profit or loss depends on the entry price — not a fixed return.
Resolution: Binary Contracts vs Bets
In sports betting, you win or lose based on the outcome. In prediction markets, each contract is worth exactly $1.00 at resolution if correct, or $0.00 if wrong. You can also sell your position before resolution — locking in profits if the market has moved in your favour, or cutting losses if it hasn't.
This ability to exit mid-market is a major advantage of prediction markets over fixed-odds betting. If you bet on a team to win a championship and they get knocked out early, you lose your stake. On a prediction market, you can sell your position as soon as the odds shift against you.
Market Coverage: Much Broader in Prediction Markets
Sports betting is limited to — you guessed it — sports. Prediction markets cover:
- Politics (elections, legislation, government decisions)
- Economics (interest rates, inflation, GDP data)
- Crypto (Bitcoin price milestones, protocol events)
- Sports (yes, sports too)
- Science and technology (AI breakthroughs, space launches)
- Entertainment and culture
If you have an edge in political analysis, macroeconomics, or a specific domain, prediction markets let you monetise that edge in ways sports betting cannot.
Fees
Traditional bookmakers build a "vig" (overround) into their odds — all outcomes sum to more than 100%, guaranteeing the house a margin. This is typically 5–10%.
Prediction markets like Polymarket charge 0% trading fees. Kalshi charges 7% on winnings only (not on the stake). Betfair and Smarkets charge 2–5% commission on net winnings. On balance, prediction market fees are often lower than bookmaker margins for the same events.
Regulation
The regulatory frameworks are completely different:
- Sports betting: Regulated as gambling in most jurisdictions (UK Gambling Commission, state gaming boards in the US, etc.).
- Prediction markets: In the US, regulated by the CFTC as commodity contracts (not gambling). In the UK, betting exchanges like Betfair are regulated as gambling. Offshore crypto markets like Polymarket operate outside traditional regulatory frameworks.
This matters for taxes: in the UK, betting exchange winnings are typically tax-free. In the US, CFTC-regulated prediction markets may qualify for favourable Section 1256 tax treatment. See our Regulation & Tax Guide for full details.
Which Platforms Bridge Both Worlds?
Some platforms blur the line between prediction markets and sports betting:
- Betfair — The world's largest betting exchange operates like a prediction market (user-to-user, variable odds, tradeable positions) but is licensed as a betting platform. Massive liquidity on sports events.
- Smarkets — Similar to Betfair, a UK betting exchange with low 2% commission and prediction market-like structure.
- Polymarket — Covers sports but is primarily a prediction market, not a sports betting platform.
Which Should You Use?
The right choice depends on your goals:
- Want to bet on sports with familiar odds formats? → Traditional bookmaker or Betfair/Smarkets
- Want to trade on political/economic events with the ability to exit early? → Prediction market (Polymarket, Kalshi)
- Want to practise forecasting risk-free? → Play-money prediction markets (Manifold, Metaculus)
- US resident wanting a regulated experience? → Kalshi or Robinhood Prediction Markets
- UK resident wanting tax-free winnings on sports and politics? → Betfair or Smarkets
Many serious forecasters use both: prediction markets for non-sports events, and betting exchanges for sports. The two complement each other well.