Evaluate a prediction-market contract as a financial position, not as a headline or a simple poll. Before placing an order, establish exactly what event will settle the contract, estimate the outcome independently, test whether the order book can handle your size, add every fee to the calculation, and confirm that the venue’s rules and your location allow the trade. If any of those answers is unclear, passing is a valid decision.
Start with the contract, not the market title
A short title can hide the details that determine whether you win. Open the complete contract specification and identify five items:
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- Event definition: the precise condition that makes the contract settle to “yes” or “no.” Look for thresholds, counting methods, geographic boundaries, and definitions of terms such as “official,” “recession,” “landfall,” or “elected.”
- Settlement source: the agency, exchange, data set, or other named source whose result controls settlement. A news story or social-media post may not be the source specified in the rules.
- Deadline: distinguish the time by which the event must occur from the later date when the venue publishes a determination. Check the time zone and whether the deadline is inclusive.
- Exceptional outcomes: read what happens if the source is delayed, revised, unavailable, contradictory, or silent. Also check treatment of ties, cancellations, partial completion, and events that occur outside the stated window.
- Settlement procedure: find the rule describing how and when the final result is declared, and whether a correction or appeal can change it.
Regulated exchanges establish and enforce their own contract rules. The Commodity Futures Trading Commission (CFTC) explains the role of exchange rules on its Understanding Prediction Markets and Event Contracts page. A venue’s rulebook is therefore part of the product you are buying. For example, a rulebook page can contain versioned contract language and procedures that are not visible in a market card; read the current version rather than relying on a screenshot or an old explanation.
Turn the wording into a settlement test
Write a one-sentence test in your own words: “This settles yes only if [defined event] is confirmed by [named source] by [deadline and time zone], under [exception rule].” Then try to find a plausible edge case that would make your sentence ambiguous. If you cannot resolve that case from the contract and rulebook, do not trade until the venue answers it in writing.
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Translate the price into a probability—carefully
For a binary contract that pays one unit if “yes” occurs and zero otherwise, a quoted price can be read as a rough market-implied probability. A price of 65 cents is commonly described as implying about a 65 percent chance. The CFTC uses 65 cents and 65 percent as an illustration in a public-comment document; it is an example of how to interpret a quote, not a measured statistic and not proof that the event has a 65 percent true probability. See the CFTC comment document.
The quote is a market price formed by orders, information, risk preferences, and trading costs. It is not an objective forecast. A 65-cent contract can still settle “no,” and a contract priced at 20 cents can settle “yes.” Treat the price as an input to analysis, not as evidence that the market is correct.
Make an independent estimate
- State your probability estimate before looking for a trade. Use a range if the evidence is uncertain (for example, 55–65 percent) and record the assumptions behind it.
- List the information that would move the estimate up or down. Give each item a source, a date, and an expected direction of impact.
- Compare your estimate with the executable price, not merely the last trade. A difference of a few cents may disappear once you pay the spread and fees.
- Recalculate if the contract wording, settlement source, deadline, or underlying facts change. Do not keep an old estimate because you already spent time developing it.
A simple expected-value check for a one-unit binary payoff is:
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expected value before costs = (your probability × 1) − price paid
For a “no” position, use the probability of “no” and the price of the “no” side. Then subtract all transaction costs, including commissions or exchange fees, spread paid at entry, and any cost of exiting early. This arithmetic does not guarantee a profit; it only makes your assumptions visible.
Check whether you can actually enter and exit
A displayed quote is not a promise that your order will fill there. Inspect the live order book immediately before trading:
- Bid: the highest displayed price someone is offering to pay.
- Offer (ask): the lowest displayed price at which someone is offering to sell.
- Spread: the gap between the bid and offer. Crossing it is an immediate trading cost.
- Depth: the quantity available at each price level. A quote for one small order may not support your full position.
- Recent trades: useful context, but a last-trade price can be stale or based on a size much smaller than yours.
Match the order type to the risk you accept
A marketable order prioritizes execution and can consume several price levels when depth is thin. A limit order caps the price you will pay (or sets the minimum you will accept) but may remain unfilled. Decide in advance whether non-execution is preferable to paying a worse price. If the order book is wide or shallow, reduce the order size, use a limit price, or pass.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsPlan the exit before opening the position
You may be able to trade out before settlement, but the available price can be unfavorable and an exit at your desired price is not guaranteed. The CFTC describes this feature as follows: “Rather than being locked in their position, customers can trade in and out of their position prior to settlement at the current market price to lock in gains or limit losses.” Read the explanation on the CFTC prediction-markets page alongside the caveat that a current market price may be below your entry price or unavailable for your size.
Before entering, write down:
- The price or condition at which you would reduce or close the position.
- What you will do if the market becomes illiquid.
- Whether you are willing to hold through settlement if an early exit is impossible.
- The maximum loss in currency terms, including fees.
Calculate total cost, not just the quoted price
Open the venue’s current fee schedule and identify every charge that applies to your account, contract, order type, and location. Include transaction fees, settlement or withdrawal charges if applicable, and the spread you expect to cross. Fees can change, so a schedule saved from a previous trade is not reliable.
There is no single fee table that applies to every prediction-market venue. Do not transfer a fee from one platform to another or assume that a zero-commission label means zero cost. Put the cost into the same probability comparison as the price:
net expected value = (your probability × payoff) − entry price − entry costs − expected exit costs
If your edge disappears after realistic costs, the trade is not attractive at that quote. You do not need to force a position simply because the event is interesting.
Verify rules, regulation, and access for your situation
Regulatory treatment, venue authorization, product availability, and litigation can change. A venue’s status in one country or state does not establish its status elsewhere, and access can differ by residence, account type, and contract. Check the current official pages for the specific venue and your location immediately before funding or trading.
Questions to answer from official material
- Which regulator, if any, supervises the venue or product, and under what authority?
- Is the particular event contract within the venue’s authorized product set?
- Are you eligible based on residence, age, identity verification, and account classification?
- What customer-fund, margin, collateral, and withdrawal arrangements apply?
- Where are the contract rules, fee schedule, privacy terms, and risk disclosures?
- What is the process for disputes, erroneous trades, data corrections, and rule changes?
The CFTC’s Economic Requirements materials and its prediction-market explainer provide regulatory context, but they do not replace the venue’s current terms or a jurisdiction-specific legal determination. Treat general educational material as a starting point and verify the contract you intend to trade.
Read the rulebook version and change history
Some venues publish numbered rulebooks. A rulebook page can identify an effective date, definitions, trading conduct rules, settlement mechanics, and correction procedures. For instance, the Kalshi rulebook page lists version 1.29 dated August 17, 2026 at the time of the cited material; use the current page, not that historical version, when checking a live contract. The page is available at Exchange Rulebook & Contract Rules.
Screen for information, conflict, and integrity risks
Do not trade on confidential nonpublic information or information obtained through a role that gives you access to the subject of the contract. Also avoid conduct that could manipulate the market, mislead other participants, or exploit a technical error.
The CFTC Enforcement Division has described cases involving misuse of nonpublic information and fraud, including a trader affiliated with the subject of a contract. Review the advisory at CFTC Enforcement Division Issues Prediction Markets Advisory. The practical test is straightforward: if your access, job, family relationship, or private communication gives you information ordinary traders cannot obtain, stop and seek legal guidance rather than trading.
Conflict checklist
- Are you employed by, advising, lobbying, auditing, or contracting with an entity named in the event?
- Do you have a confidentiality obligation, embargoed data, or privileged access?
- Could your public statement, operational action, or trading activity influence the event or its reported result?
- Does the venue prohibit particular participants, strategies, or coordinated activity?
When the answer is uncertain, disclose the issue to the venue through its official compliance channel and do not place the order while you wait.
Compare contracts or venues with the same decision framework
Use the following matrix for each candidate. It is designed to expose a reason to pass, not to produce a forced ranking.
| Decision area | What to verify | Evidence to record |
|---|---|---|
| Event and settlement | Definition, source, deadline, time zone, exceptions, and final determination process | Contract section and current rulebook version |
| Price and probability | Executable bid and offer, your independent probability, and assumptions that could change it | Time-stamped quote and written estimate |
| Execution quality | Spread, depth at your intended size, order types, and expected slippage | Order-book levels and a test order plan |
| Costs | Current fees, other transaction charges, and the cost of crossing the spread | Official fee schedule and net-value calculation |
| Exit and settlement | Early-trading availability, settlement timing, and what happens if the result is revised or disputed | Liquidity check and applicable rule sections |
| Access and oversight | Regulatory status, jurisdiction eligibility, account requirements, and customer protections | Current regulator and venue pages |
| Integrity | Insider-information restrictions, manipulation rules, conflicts, and reporting channels | Conduct rules and your conflict assessment |
This comparison does not establish which venue has better execution or lower fees. Those are live, contract-specific facts that must be checked from current official material.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A repeatable pre-trade workflow
- Capture the contract. Save the full text, settlement source, deadline, and rulebook version you reviewed. Record the date and time because wording and quotes can change.
- Write the settlement test. State the exact condition for “yes,” including edge cases and the authoritative source.
- Estimate independently. Produce a probability range, list the evidence, and identify what would change your mind.
- Observe the live book. Record bid, offer, spread, and available quantity at each relevant level. Compare them with your planned size.
- Price the trade after costs. Use the current fee schedule and a conservative estimate of slippage. Reject the trade if the remaining edge does not compensate you for uncertainty.
- Confirm eligibility and conduct. Check location, account rules, regulatory access, and any personal-information or conflict restriction.
- Choose an order and limit. Decide whether a limit order, smaller size, or no order best fits your loss limit and execution needs.
- Set an exit rule. Define when you will close, what you will do if liquidity disappears, and whether you accept holding through settlement.
- Monitor only the assumptions that matter. Follow the named settlement source and material evidence; do not trade repeatedly in response to noise.
- Recheck before sending. Confirm contract version, quote, fees, size, side (“yes” or “no”), and total maximum loss. Then submit—or pass.
Common failure modes and how to recover
You traded the headline instead of the contract
Symptom: You discover that the settlement source uses a different definition or deadline than the news story. Recovery: Stop adding to the position, reread the full rule, and recompute the probability for the actual event. If the mismatch is material, close at a price you can obtain or hold only if the revised risk fits your plan.
Your order filled at a worse average price
Symptom: Thin depth caused the order to consume multiple price levels. Recovery: Compare the filled average with your pre-trade limit and maximum loss. For future trades, reduce size, use a limit order, and inspect depth rather than the top quote alone.
You cannot exit when you expected
Symptom: There is no buyer at your desired price, or the spread has widened. Recovery: Treat the position as one you may have to hold through settlement. Do not assume that the last trade or a displayed indicative price is executable.
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A rule or result changes
Symptom: The venue publishes a correction, clarification, or revised source result. Recovery: Read the effective rule and correction procedure, save the notice, and contact the venue through its documented dispute channel if the application is unclear. Do not rely on informal commentary to determine your rights.
You identify a possible conflict after entering
Symptom: You realize that your role or information may be restricted. Recovery: Stop trading the contract, preserve relevant records, and ask the venue’s compliance team or qualified counsel how to proceed. Do not attempt to conceal or trade around the issue.
When passing is the best trade
Pass when the event definition has unresolved ambiguity, the settlement source is inaccessible or unreliable, your independent estimate is no better than the market after costs, the order book cannot support your size, or the venue’s rules and access are unclear. Passing also makes sense when you cannot monitor a deadline, accept the possibility of an unfavorable exit, or stay within the venue’s integrity requirements.
A prediction-market checklist cannot guarantee a profitable trade. Its purpose is narrower and more useful: to ensure that any position you take is based on a contract you understand, a price you can justify, execution you can afford, and rules you are prepared to follow.
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