A prediction market is a market in which participants trade contracts whose payouts depend on specified future outcomes. Prices can provide an evolving, market-implied forecast of those outcomes. Binary yes/no contracts are common, but other structures can cover multiple choices or outcome ranges. Blockchain is not a defining requirement; platforms can use conventional or blockchain-based infrastructure.
How Trading and Settlement Work
A prediction market starts with a precisely defined question, a trading period and settlement rules. The rules specify the payout, the deadline for evaluating the event, the evidence source and who determines the result. Participants then buy or sell positions as their expectations change. Once the outcome is verified under those rules, the contract settles and the appropriate payout is made. If trading is available and sufficient liquidity exists, a position may be sold before settlement rather than held to expiry.
Trading can use an order book, where compatible buy and sell orders execute against each other. In a continuous double auction, participants can submit orders throughout the trading session. Alternatively, an automated market maker (AMM) offers algorithmically priced trades against available liquidity; it does not necessarily match a buyer with another seller. These are alternative mechanisms, not guarantees of liquidity or active trading.
How Prices Become Forecasts
For a hypothetical contract that pays $1 if its condition is met and zero otherwise, a price of $0.70 suggests roughly a 70% market-implied probability. A buyer holding that contract to settlement gains $0.30 if the condition is met or loses the $0.70 purchase price if it is not, before fees. This simple probability reading depends on the payout structure; not every contract price can be read directly as a percentage.
A prediction market price can aggregate dispersed information because participants have an incentive to act on disagreements. Someone who considers the price too low can buy, while someone who considers it too high can sell where permitted. Those trades can move prices as information and demand change. The resulting forecast reflects participating traders and the capital they commit, not an equally weighted survey of everyone’s beliefs.
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Get startedWhat the Contracts Forecast
A prediction market forecasts the outcome written into its contract, not every aspect of the underlying event. Applications include elections, economic releases, sports and defined financial or crypto events. An election contract about whether a candidate wins estimates the likelihood of victory, not that candidate’s vote share. An economic contract may ask whether an indicator exceeds a specified threshold, rather than predict its exact value. A contract tied to an asset-price event does not confer ownership of that asset. Participants may speculate or offset a related exposure, while observers may use prices as one input to a broader forecast.
Limitations and Interpretation
A prediction market price is an uncertain estimate, not an objective probability or a guaranteed outcome. Thin liquidity can leave prices stale or make them sensitive to small trades, while fees and bid–ask spreads complicate interpretation. Participant biases and attempts at manipulation can also weaken the signal. No market should be assumed consistently more accurate than polls or experts without examining the question, benchmark and forecasting horizon.
Settlement introduces a separate risk: ambiguous wording, disputed evidence or unclear treatment of delays can make the payout differ from what a participant expected. Clear timing, resolution sources and cancellation rules therefore matter as much as the headline question. Access and permitted contracts depend on jurisdiction and platform; regulatory oversight does not eliminate losses or misconduct. A purchased contract can expire worthless.
