How Prediction Market Pricing Works: Prices, Probability, and Order Books

A prediction market price is a number between 1¢ and 99¢ that displays three things at once: the market's probability estimate, the cost of a position, and the most you can lose per contract.

This guide takes each in turn: how the order book sets the price, what the spread and fees add, why it moves, and how much weight it deserves as a forecast.

New to prediction markets? Start with our guide to prediction markets, or our step-by-step trading guide for the mechanics.

What a Prediction Market Price Means

Every event contract in a prediction market represents a binary question. A YES contract settles at $1.00 if the event happens and $0 if it does not; a NO contract does the reverse. The two prices always total roughly $1.00, with the gap accounted for by the spread between buyers and sellers.

Let's say you buy one YES contract at 67¢. If the event happens, it settles at $1.00, a gross gain of 33¢ before fees. If not, it settles at $0 and you lose the full 67¢ plus entry fees. At 67¢, the market implies that the second outcome happens roughly 33 times in 100.

How to Convert a Price Into Implied Probability

The conversion runs both ways: if your own view is 75%, fair value by your estimate is 75¢.

Implied probability = contract price × 100

Gains are gross, and are calculated before fees are factored in. With prediction markets, there is no percentage-based house margin built into the contract price. Rather, your costs are the spread and the per-contract fee, both shown before you confirm an order.*

How the Order Book Sets Prediction Market Prices

Bids vs. Asks

There is no person or invisible hand that sets a prediction market price. A bid is a standing offer to buy, while an ask is a standing offer to sell. The book stacks every live bid against every live ask, with the best of each facing the other across a gap. When they meet, a trade executes and the quoted price updates continuously (which is why prices may move while you watch).

Market Orders vs. Limit Orders

• Market orders take the best available price immediately
• Limit orders post your price and wait, so you may get a better fill or none at all

If a contract shows a bid of 62¢ and an ask of 64¢, buying will currently cost 64¢, with that 2¢ gap representing the bid-ask spread.* In any prediction market, liquidity depth is another consideration that's just as important as the top of the book: a 1¢ spread with few contracts behind it is much less liquid than it looks, and will affect your trading experience.

Two details are specific to Fanatics Markets. 1) Some liquidity comes from an affiliated market maker, Morton St. Market Maker, LLC, which may quote both sides and against which your orders may match. And 2) combos are not priced off the order book. A combo price is a quote you are offered through a Request for Quote process, rather than a level resting in a book.

Slippage: Why Your Fill Price Can Differ From the Screen Price

This price discrepancy is one of the most common practical pricing questions, and it does not mean anything has gone wrong in your trade. A displayed price is simply a snapshot of a book that updates continuously. Other traders' orders keep arriving while yours is in flight, and in a fast market this delay might be long enough for the best available price to change.

Fanatics Markets discloses this in the fee schedule: order details including price may change between submission and execution, and the fee is recalculated on the actual execution price. Slippage also runs both ways, and an order that cannot fill at an acceptable price simply does not fill.

How Price Tolerance Works

Price tolerance puts you in control of the price you're willing to accept. You decide how much the market can move between placing your order and its execution.

On Fanatics Markets, price tolerance is set per trade in the order slip and defaults to zero. At zero, the order fills only at the displayed price or better. If it's wider, it can still fill when the market moves, at a price that may be worse than the one you saw.

The trade-off is symmetrical, since a tight tolerance protects your price and rejects more orders, while a wider tolerance completes more trades at "worse" prices. Neither reduces the risk that the contract may settle at $0, which is an inherent risk in any event contract.

In short, the price tolerance governs your entry price, rather than your trade outcome.

What Trading Costs: The Spread and Trading Fees

What the Spread Costs You

How wide the spread is tells you a good deal about how liquid a market is. A tight spread of one or two cents means there is real depth on both sides of the book, and you can enter and exit close to fair value. A wide spread of five to ten cents means liquidity is thin, your effective cost of trading is higher, and even a modest order can push the price against you as it works through the contracts available at each level.

Going back to that 62¢ / 64¢ market, you would buy at 64¢ but sell at 62¢, so entering and immediately exiting a position costs you 2¢ per contract before fees. That gap is a cost you absorb the moment you enter, whether or not the price later moves in your favor.*

Heavily traded markets tend to carry the tightest spreads, while niche markets and those resolving far in the future are usually thinner, so it is worth checking both sides of the book, and how many contracts sit behind the best price, before you enter a position.

What the Trading Fee Costs You

The total trading fee is charged on each contract you buy or sell, applies only to orders that actually match on the exchange, and is shown in the order window before you confirm. It does not stay constant across the price range. Rather, fees are generally highest for contracts trading near $0.50 and fall away toward $0.01 and $0.99, so the fee weighs most heavily where the outcome is least certain.

Rates may be updated from time to time within the stated range, and the current figures are regularly published on the Fanatics Markets fee schedule. Both costs should be taken into consideration alongside the contract price itself, because a contract that settles at $0 costs you what you paid for it plus the fees you paid to enter.

Why Prediction Market Prices Move

As new information arrives, the quickest traders act and take out the orders already resting on the book. Next, the quoted price jumps, slower participants reassess and add orders of their own, and the price settles at a new level.

Depending on the market, this movement can take seconds after a sports headline, or hours after a complex economic release.

In sports, a starting pitcher ruled out shortly before first pitch changes the expected shape of the game, and contracts on it reprice as traders reevaluate the market. In economy markets, an inflation reading away from consensus reprices the contracts tied to it almost immediately, and can pull related markets with it, such as those on upcoming Fed decisions.

Prices also move before anything happens, because a contract is priced on what traders expect rather than on what has already occurred. The first move after major news often overshoots before partially retracing, a pattern well documented across financial markets. For instance, a position that may look correct an hour after you entered it can still settle at $0.

How Prices Converge as a Market Nears Resolution

• Weeks out, a price reflects genuine uncertainty.
• Hours out, much of it has been resolved and prices sit closer to settlement value.

The drift toward $0 or $1.00 is what convergence means, and it is a tendency rather than a smooth glide. Late trading is also where prices move most violently, because the most decisive information arrives then.

For example, a YES contract at 95¢ can gain at most 5¢ before fees, since $1.00 is the ceiling. If the event does not happen, it settles at $0 and you lose the full 95¢ plus entry fees. The maximum loss is capped at what you paid, but 95¢ is a large amount to pay for a possible 5¢ gain, and for the roughly 5% of the time that the market implies it does not happen, you lose all of it.

The cheap end is no free option either: 5¢ implies roughly a 5% chance, so the most likely outcome is also $0.*

How Pricing Differs by Market Category

The price-equals-probability principle is the same in every category of prediction markets. What differs is how often new information arrives, how fast traders act on it, and how long positions stay open:

Sports contracts generally move fastest because the information is frequent, public, and directly tied to the outcome. Culture contracts generally move slowly because fewer participants watch continuously, which is why those books are often thinner and their spreads wider.

Browse live markets: Sports · Economy · Politics · Culture · Crypto

Frequently Asked Questions About Prediction Market Pricing

1) What does a prediction market price mean?

A price is the market's implied probability that an event occurs, listed in cents. A YES contract at 75¢ implies roughly a 75% chance of the event occurring. If the event happens, the contract settles at $1.00; if not, it settles at $0 and you lose what you paid plus fees.*

2) How do you convert a prediction market price to a probability?

Simply multiply the price by 100. A YES contract at 42¢ implies 42%; the matching NO contract at 58¢ implies 58%. YES and NO always total roughly $1.00, with the difference explained by the bid-ask spread. This also works in reverse: a 55% personal estimate corresponds to a fair value of 55¢.

3) What is the bid-ask spread in prediction markets?

The bid-ask spread is the gap between the highest price a buyer will pay and the lowest a seller will accept. A 1–2¢ spread indicates a fairly liquid market; 5–10+¢ indicates thin liquidity and higher cost. You cross the spread every time you trade for immediate execution, so treat it as a cost already incurred on entry.

4) How does an order book work in a prediction market?

An order book is a continuous double auction where buyers post bids and sellers post asks. When the highest bid meets the lowest ask, a trade executes and the quoted price updates. Depth is also an important factor, since a large order fills through multiple levels at worse prices.

5) Why did my order execute at a different price than the one displayed?

Displayed prices are a mere snapshot of a continuously updating order book, not a guaranteed fill. Between submission and execution the best available price can move, due to slippage. A price tolerance setting defines how much movement (slippage) you are willing to accept: tighter tolerance rejects more orders, while wider price tolerance completes more orders at less favorable prices.

6) Why do prediction market prices change?

Prices change when new information reaches traders and shifts their view of how likely an outcome is. When new orders hit the order book, the price settles at a new level. Prices also move on expectations, which is why a contract can reprice well ahead of the event it references.

7) What does it cost to trade an event contract on Fanatics Markets?

Beyond the contract price, you pay two things in every prediction market trade: the bid-ask spread, and a per-contract trading fee. On Fanatics Markets, the fee runs from $0.0034 to $0.0275 and is charged on every matched order, whether you are buying or selling. The exact amount appears in the order window before you confirm, and current rates are on the fee schedule.

8) Are prediction market prices accurate?

In aggregate, research finds them informative rather than strictly accurate or inaccurate. The technical term is calibration: whether outcomes priced at 70¢ actually happen about 70% of the time across a large sample of markets.

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*Any trades or visuals of the services shown are illustrative, not trade recommendations, and prices are subject to change. You may lose the entire amount you invest.

HYPOTHETICAL PERFORMANCE RESULTS HAVE MANY INHERENT LIMITATIONS, SOME OF WHICH ARE DESCRIBED BELOW. NO REPRESENTATION IS BEING MADE THAT ANY ACCOUNT WILL OR IS LIKELY TO ACHIEVE PROFITS OR LOSSES SIMILAR TO THOSE SHOWN. IN FACT, THERE ARE FREQUENTLY SHARP DIFFERENCES BETWEEN HYPOTHETICAL PERFORMANCE RESULTS AND THE ACTUAL RESULTS SUBSEQUENTLY ACHIEVED BY ANY PARTICULAR TRADING PROGRAM.

ONE OF THE LIMITATIONS OF HYPOTHETICAL PERFORMANCE RESULTS IS THAT THEY ARE GENERALLY PREPARED WITH THE BENEFIT OF HINDSIGHT. IN ADDITION, HYPOTHETICAL TRADING DOES NOT INVOLVE FINANCIAL RISK, AND NO HYPOTHETICAL TRADING RECORD CAN COMPLETELY ACCOUNT FOR THE IMPACT OF FINANCIAL RISK IN ACTUAL TRADING. FOR EXAMPLE, THE ABILITY TO WITHSTAND LOSSES OR TO ADHERE TO A PARTICULAR TRADING PROGRAM IN SPITE OF TRADING LOSSES ARE MATERIAL POINTS WHICH CAN ALSO ADVERSELY AFFECT ACTUAL TRADING RESULTS. THERE ARE NUMEROUS OTHER FACTORS RELATED TO THE MARKETS IN GENERAL OR TO THE IMPLEMENTATION OF ANY SPECIFIC TRADING PROGRAM WHICH CANNOT BE FULLY ACCOUNTED FOR IN THE PREPARATION OF HYPOTHETICAL PERFORMANCE RESULTS AND ALL OF WHICH CAN ADVERSELY AFFECT ACTUAL TRADING RESULTS.