A 70-cent YES contract that pays $1 if its stated event occurs suggests a market-implied probability of about 70%—but it does not promise a 70% chance of profit. The contract’s exact wording determines what counts as YES; the quote you see may not be the price at which you can trade; and a winning payout is not the same as profit. Read the resolution terms first, then interpret the price and account for costs and trading conditions.
What does a 70-cent prediction market contract mean?
For a simple binary contract that pays $1 for YES and $0 for NO, a YES price of $0.70 is commonly read as roughly 70% market-implied probability. The Commodity Futures Trading Commission (CFTC) puts it this way: “A contract’s price reflects traders’ perceived probability of the event outcome.” That is a description of the market price, not a guarantee about what will happen.
Polymarket US uses the same 70-cent example, while Kalshi’s educational guide uses 65 cents to illustrate a roughly 65% implied likelihood. These are examples of how to read prices, not evidence that the markets’ forecasts are calibrated or accurate. A price can reflect participants’ expectations alongside trading activity, liquidity, and the particular quote being displayed.
The cents-to-percent shortcut applies most directly to a fixed-payout binary contract. For contracts with several outcomes or ranges, check the payout design before treating any price as a probability. Prices across possible outcomes represent market-perceived likelihoods, but the simple binary arithmetic may not apply.
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Check what the contract actually promises
“YES” means that the contract’s specific resolution condition is met—not necessarily that the event happened in the everyday sense implied by a short headline. The venue’s published terms control settlement. Before interpreting a quote or taking a position, open the market details and identify:
- The exact condition: What event, threshold, or result makes the answer YES?
- The time window: What deadline or interval applies, and how are events close to that boundary treated?
- The resolution evidence: Which data, record, or source is designated to establish the outcome?
- The decision process: Who determines settlement, and under which venue rulebook?
- Contingencies: What do the terms say about delays, cancellations, revisions, ambiguity, or other edge cases?
- Payoffs and costs: What does each outcome pay, and what fees or other costs may apply?
The CFTC says customers are entitled to timely, transparent information about trading rules and contract terms, including payout, prices, and how, when, and by whom settlement is determined. Its consumer guidance also recommends reviewing market-specific rules and understanding fees and other costs. For a particular market, those written terms matter more than an informal summary or a trader’s assumption about what would be fair.
Separate payout from profit
Suppose you buy one YES contract for $0.70. If it settles YES and pays $1, your gross gain is $0.30 before fees and taxes. If it settles NO and pays $0, you lose the $0.70 purchase price. The $1 figure is the winning payout, not the profit.
The CFTC illustrates a complementary binary contract with YES at $0.70 and NO at $0.30. Do not assume that displayed YES and NO quotes always add to exactly $1: a screen may show bids, asks, last trades, or other prices, and spreads, fees, and market conditions can produce differences.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesKnow which quote you are looking at
A displayed number may be a bid, an ask, the last traded price, or a midpoint. These are different kinds of information, and not all are prices at which you can immediately trade. The CFTC notes that order books commonly show real-time customer bids and asks. An order to buy or sell may execute against the available ask or bid rather than at the chart’s last price.
- Bid: A price someone is offering to pay to buy the contract.
- Ask: A price someone is offering to accept to sell it.
- Last trade: The price of a previous transaction; it may no longer be available.
- Midpoint: A point between bid and ask, which may not be executable.
The gap between the best available bid and ask is the spread. Thin liquidity can make a displayed quote less representative of a readily available trade and can make it harder to exit a position. The CFTC notes that complex contracts may attract fewer participants and comparatively lower liquidity. A participant may trade out before settlement at the current market price, if the market has sufficient availability; that price can differ from the original purchase price and the eventual settlement payout.
A price move records a change in traded market expectations, not proof that the event’s real-world likelihood changed by the same amount. New information, trading activity, liquidity, and costs can all contribute to a changed quote.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Compare contracts by their terms and trading conditions
When comparing two markets or venues, look beyond the headline and the apparent probability. Check the dimensions that determine what the contract means and what it may cost to trade:
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| What to compare | What to verify |
|---|---|
| Resolution wording and source | The precise event condition and the specified evidence used to resolve it. |
| Timing and decision process | The relevant deadline, expected settlement timing, who determines the result, and the governing rulebook. |
| Payout design | Whether the market is binary, multi-outcome, or range-based, and what each outcome pays. |
| Trading conditions | Current bid and ask, spread, available liquidity, and whether a displayed quote is executable. |
| Costs and applicable rules | Fees and other costs, venue rules, customer protections, and current eligibility for your jurisdiction. |
Rules, fees, eligibility, and platform features can change. Confirm current terms directly with the venue and consult official regulator information rather than assuming that one venue’s process or protections apply to another.
Understand the risk before trading
An implied probability is a shorthand for a market price, not an objective forecast or a promise of return. You can lose the amount paid if the contract resolves against your position, and costs can reduce returns. Before trading, read the contract rules, understand the fees and other costs, and consider the CFTC’s guidance to use only risk capital you can afford to lose. The CFTC’s consumer materials are general information, not individual legal or investment advice.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
