Quick answer
A prediction market is a platform where users buy YES or NO shares representing the probability of a future event. YES shares settle at $1 if the event occurs; NO shares settle at $1 if it doesn't. The share price (between $0 and $1) reflects the market's collective probability estimate. Decentralised prediction markets like Polymarket run on blockchains, require no identity verification, and settle automatically via oracle networks.
What Are Prediction Markets?
Prediction markets are platforms where participants buy and sell outcome shares — binary contracts that pay $1 if a specific event occurs and $0 if it does not. The current price of a share reflects the market's collective probability estimate for that event.
For example, if a Polymarket question asks 'Will the Bank of England cut rates by September 2026?' and YES shares trade at $0.72, the market implies a 72% probability of a cut. As new data arrives — inflation figures, central bank minutes — traders buy or sell shares, continuously updating the consensus probability in real time.
Prediction markets are considered more accurate than polls because they aggregate the private information of thousands of participants who have real financial stakes. Academic research consistently shows liquid prediction markets outperform expert forecasters for many event types.
How Decentralised Prediction Markets Work
- 01
Market creation
Anyone can create a market by specifying an event question, a resolution date, and a resolution source — the oracle or authoritative entity that will confirm the outcome.
- 02
Share trading
Participants buy YES or NO shares using stablecoins (typically USDC). YES + NO share prices always sum to approximately $1, reflecting complementary probabilities.
- 03
Liquidity provision
Liquidity providers deposit stablecoins into the market's AMM, earning trading fees from share transactions. Without liquidity, spreads are wide and the market is difficult to trade.
- 04
Event resolution
When the event concludes, an oracle (UMA's optimistic oracle on Polymarket; Chainlink on others) reports the outcome. Smart contracts automatically settle all positions.
- 05
Payout
Winning share holders receive $1 per share. Losing share holders receive $0. Liquidity providers withdraw their remaining capital plus earned fees.
Leading Decentralised Prediction Market Platforms
| Platform | Blockchain | Key Markets | Notable |
|---|---|---|---|
| Polymarket | Polygon | Politics, crypto, economics, sports | Largest by volume; $600M+ on 2024 US election |
| Gnosis / Omen | Gnosis Chain | Finance, world events, crypto | Oldest decentralised prediction market; founded 2015 |
| Augur | Ethereum | Any topic (permissionless creation) | Fully decentralised; REP token holders resolve disputes |
| Manifold | Hybrid on-chain | Community-created topics | Social prediction market; used for informal forecasting |
| Drift Protocol | Solana | Crypto price events, DeFi outcomes | Primarily a perps DEX with integrated prediction markets |
Polymarket: The Dominant Platform
Polymarket became the highest-profile prediction market during the 2024 US presidential election, processing over $600M in volume on the single question of who would win the presidency. Its implied probabilities tracked closely with final results and were widely cited by mainstream journalists as more accurate than polling aggregators.
Polymarket runs on Polygon and uses USDC for all transactions. Users connect a Web3 wallet, deposit USDC, and trade any active market with no identity verification required. US users face trading restrictions due to CFTC regulatory constraints.
Market resolution uses UMA Protocol's optimistic oracle. Anyone can propose a resolution answer; if unchallenged for 48 hours it becomes final. If challenged, UMA token holders vote to determine the correct outcome — creating a decentralised dispute resolution layer.
Legal Status of Prediction Markets in the UK
The legal classification of prediction markets in the UK is unsettled. Under the Gambling Act 2005, event-based contracts may require a UK Gambling Commission licence. Under the Financial Services and Markets Act 2000, they might be classified as contracts for differences (CFDs), requiring FCA authorisation.
As of 2026, no UK regulator has issued comprehensive guidance specifically on decentralised prediction markets. Platforms are accessible to UK users but hold no UK licences. Most casual participation falls outside current enforcement priorities, but the area is evolving.
Prediction markets in the UK operate in a legal grey area — they may be classified as gambling or regulated financial instruments depending on interpretation. Check current FCA guidance before significant participation.
Frequently asked questions
Are prediction markets accurate?
Liquid prediction markets consistently outperform polls and expert forecasters for many event types. Polymarket's 2024 US election odds were closer to the final outcome than all major polling aggregators. Markets work best when there are many informed participants with financial stakes and good information about the event.
How do prediction markets make money?
Platforms earn trading fees (typically 0.1–2% per trade) and market creation fees. Liquidity providers earn a share of trading fees in exchange for providing capital to the AMM. Some platforms also take a share of resolved market winnings.
What happens if a result is disputed?
Polymarket uses UMA's optimistic oracle — anyone can challenge a resolution within 48 hours, triggering a vote by UMA token holders. Augur uses REP holders to dispute incorrect resolutions. These decentralised dispute processes can take days to weeks but are less corruptible than centralised adjudication.
Can I create my own prediction market?
Yes. On Augur and Manifold, anyone can create a market on any topic. Polymarket reviews markets before going live. The key when creating a market is specifying a clear, unambiguous resolution source — ambiguous markets lead to disputes and undermine trading confidence.