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Contract Price

The contract price is the current market price of a single prediction market share, expressed as a value between $0.00 and $1.00, which simultaneously represents the cost to enter the position and the crowd's probability estimate for that outcome.

Updated June 25, 2026Market Fundamentals
TL;DR
The contract price is what you pay per share right now -- and it doubles as the market's live probability estimate.

Key Points

✓Contract prices range from $0.01 to $0.99 in active markets, bounded by the $0 loss floor and $1 payout ceiling.
✓On a binary market, the YES contract price plus the NO contract price equals approximately $1.00.
✓Price updates continuously as buy and sell orders flow through the matching engine.
✓A higher contract price means the market considers the event more likely to occur.
✓Traders profit or lose on the difference between the price they paid and the $1.00 (win) or $0.00 (loss) settlement value.

What the Contract Price Represents

Every Event Contract trades at a price set by live supply and demand in the Order Book. This price encodes two pieces of information at once: the cost to acquire one share and the Implied Probability of the event. Because a winning share always settles at $1.00, a contract bought at $0.65 earns $0.35 profit per share if correct and loses $0.65 per share if wrong. The Price as Probability relationship emerges naturally from this fixed-payout structure -- rational traders will not pay more than their true probability belief, and competitive arbitrage pushes prices toward consensus. The Last Price is the most recent executed trade, while the Midpoint Price of the Bid-Ask Spread is often used as the reference for current fair value.

Factors That Move the Contract Price

Contract prices shift whenever the balance of buying and selling pressure changes. News events, polling data, official announcements, or insider trading can all move prices rapidly. Large orders create Slippage by consuming multiple price levels in the Order Book, particularly when Liquidity is thin. Trading Volume and Open Interest indicate how actively a market is traded and how much capital is committed. On decentralized platforms like Polymarket, an Automated Market Maker provides baseline prices even when order-book depth is shallow. Traders performing Line Shopping compare contract prices across platforms to find the most favorable entry. Mark-to-Market accounting reflects the current contract price as the unrealized profit or loss on an open Position.

Related Terms

Implied Probability
Implied probability is the likelihood of an event occurring as expressed by the current market price of a prediction market contract. On binary markets, a contract priced at 65 cents implies a 65% chance the event resolves YES.
Price as Probability
Price as probability is the core interpretive principle of prediction markets: because a winning contract always pays exactly $1.00, the current market price of a contract (expressed in dollars) equals the crowd's collective probability estimate for that outcome occurring.
Bid-Ask Spread
The bid-ask spread is the gap between the highest price a buyer is willing to pay (the bid) and the lowest price a seller is willing to accept (the ask) for an event contract. This gap represents an implicit transaction cost every trader pays when entering or exiting a position.
Last Price
The last price is the price at which the most recent trade was executed for a given event contract. It serves as a simple, backward-looking reference point for where the market has been, though it may not reflect the current best available price.
Order Book
An order book is the real-time electronic ledger that lists all outstanding buy (bid) and sell (ask) orders for an event contract, organized by price level. It is the central mechanism through which prediction market exchanges match buyers and sellers.

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