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What Is a Prediction Market? Complete UK Beginner's Guide

What is a prediction market and how do they work? Complete UK beginner's guide to trading real-world events on platforms like PolyGram and Polymarket.

Priya Anand
Sports Editor — Odds & Form · · 3 min read
✓ Fact-checked · 📅 Updated 9 June 2026 · 3 min read
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What Is a Prediction Market?

Prediction markets are venues where traders exchange contracts tied to the results of forthcoming occurrences. The cost of any given contract mirrors what the broader market believes is the likelihood of that event taking place. PolyGram offers UK-based participants entry into prediction markets spanning international developments.

How Do Prediction Markets Work?

Each market contract poses a straightforward question: will Event X occur before Date Y? Consider this illustration: "Will the Conservative Party secure victory in the next UK general election?" Two contract types are presented:

  • YES: Should the Conservative Party prevail, this contract settles at $1.00
  • NO: Should the Conservative Party fail to prevail, this contract settles at $1.00

When the current YES quote sits at $0.65, traders collectively assess a 65% chance of Conservative victory. You may purchase YES if you believe the odds are in their favour, or NO if you reckon otherwise. Correct predictions yield gains; incorrect ones result in losses on your investment.

Prediction Markets vs Traditional Betting

  • No overround: Conventional bookmakers embed a profit margin — prediction markets eliminate this. YES and NO prices combine to roughly $1.00
  • You can sell before resolution: Unwind your position at any point prior to the final outcome materialising
  • Transparent: Market prices and order book information remain fully accessible to all participants
  • Crowd wisdom: Pricing incorporates insights from numerous traders simultaneously — typically surpassing traditional polling in accuracy

Types of Prediction Markets

Political Markets

Electoral contests, public sentiment measures, legislative developments, ministerial transitions. These command the greatest participation and deepest liquidity across venues such as Polymarket.

Sports Markets

Game results, championship victors, individual athlete performances, divisional standings.

Crypto Markets

Digital asset valuations, blockchain infrastructure changes, investment product approvals, governmental regulatory shifts.

World Event Markets

Macroeconomic data releases, environmental catastrophes, technological breakthroughs, cultural accolades.

Prediction markets occupy uncertain legal territory within the United Kingdom. They lack explicit authorisation from the Gambling Commission yet face no formal prohibition either. Operators such as PolyGram function via distributed ledger settlement mechanisms, distinguishing them from conventional gaming frameworks.

How Accurate Are Prediction Markets?

Empirical evidence repeatedly demonstrates that prediction markets surpass specialist analysts and conventional survey data in forecasting precision. Polymarket successfully anticipated outcomes across the 2024 American presidential race, numerous continental European electoral contests, and significant blockchain-related developments well in advance of their occurrence.

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Priya Anand
Sports Editor — Odds & Form

Priya benchmarks sports prediction-market lines against traditional sportsbooks. Specialism: Premier League, NBA, and the major European cup competitions.