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A prediction-market trade is worth considering only after you can answer five questions: What exactly will be settled, what probability does the price imply, can you enter and exit at a reasonable price, what will the complete transaction cost be, and are the venue’s rules and access acceptable for you? Work through those questions in that order, using the contract’s full text and current official venue and regulator information. The right conclusion is sometimes to pass.
Start with the contract, not the market title
A short market title is a label, not the legal definition of what you are buying. A binary event contract generally pays according to whether a specified outcome occurs, but the exact event, evidence and settlement procedure control the result. Read the complete contract specification, the venue’s rulebook and any linked market-specific rules before looking at the price.
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Identify the event precisely
- Outcome: Write the event in one unambiguous sentence. Define the threshold, comparison, location, person, organization or measurement involved.
- Deadline: Record the cutoff date and exact time zone. Ask whether the event must occur by that time, be announced by that time, or be measured over a period ending then.
- Resolution source: Note the named government agency, exchange, data provider, election authority, sports body or other source that determines the result. A source that publishes a revised figure may be treated differently from one that issues a final determination.
- Evidence hierarchy: Check which publication controls if two sources disagree, a source is delayed, or a web page is corrected.
- Exceptional cases: Look for rules covering cancellations, postponements, ties, missing data, natural disasters, legal changes, recounts, revised statistics and events that occur outside the stated window.
Regulated exchanges establish and enforce contract rules. The U.S. Commodity Futures Trading Commission (CFTC) explains the role of exchange rules in its Understanding Prediction Markets and Event Contracts page. A venue’s current rulebook should be your controlling reference, not a screenshot, social-media post or third-party summary.
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| Question | What to record | Why it can change the trade |
|---|---|---|
| What is being measured? | Exact variable, threshold and unit | A small wording difference can turn a “yes” into a “no.” |
| Who or what decides? | Official resolution source and backup procedure | Your preferred data source may not control settlement. |
| When is it decided? | Deadline, time zone and publication timing | An event after the cutoff may not count, even if it is widely expected. |
| What happens in an edge case? | Cancellation, tie, postponement, revision and missing-data treatment | Rare outcomes often determine whether a contract settles or is voided. |
| Can the result be corrected? | Correction window, dispute route and finality rule | A settlement can be reviewed under the venue’s process rather than your own judgment. |
For an example of how a venue presents its governing material, consult the current Exchange Rulebook & Contract Rules. The page listed version 1.29 dated August 17, 2026 at the time of the source review; versions and terms can change, so verify the live page before trading.
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Translate the price into a probability—carefully
For a binary contract that pays $1 if “yes” occurs and nothing otherwise, a quoted price can be read as a rough market-implied probability. A price of $0.65 is commonly interpreted as about 65%, before fees and other frictions. A CFTC public-comment document uses 65 cents as an illustrative example of that interpretation; it is not a measured statistic and does not prove that the true probability is 65%. See the document at the CFTC comments system.
Make an independent estimate
Do not treat the displayed probability as an objective forecast. Form your own estimate from information you can explain, then list the facts that would make you raise or lower it. Your estimate should answer:
- What is the base rate for comparable events?
- Which current evidence moves the estimate away from that base rate?
- How reliable and timely is each information source?
- What uncertainty remains because the contract definition or evidence is incomplete?
- What new fact would change your estimate, and by how much?
For a $1 “yes” contract, an illustrative pre-fee calculation is:
expected value = (your probability × $1.00) − contract price
If your estimate is 72% and the offer is $0.65, the difference is $0.07 per contract before fees, slippage and the possibility that your estimate is wrong. That is not a guaranteed profit or a recommendation. A small apparent edge may disappear once costs and uncertainty are included.
Account for the side you actually trade
Use the price available for your intended order, not an abstract midpoint. If you buy “yes,” the relevant figure is the current offer; if you sell or buy the complementary side, use the applicable bid or offer for that side. A midpoint can make a market look attractive even when the executable price is not.
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For a contract with a $1 payout, the approximate break-even probability is the all-in amount you must pay, expressed as a fraction of the payout. Fees, spread and expected slippage raise that break-even level. If you cannot state your break-even probability after those costs, you have not finished the valuation.
Check whether the order can actually fill
A displayed last trade is historical information, not a promise that a new order will execute there. Before entering, inspect the current bid, offer, spread and order-book depth at the size you intend to trade.
Measure the execution conditions
- Bid: The price currently offered by buyers. It matters if you need to sell or exit.
- Offer: The price currently requested by sellers. It matters if you need to buy.
- Spread: The gap between bid and offer. Crossing it is an immediate trading cost.
- Depth: The quantity available at each price level. A small top-of-book quantity may not support your intended position.
- Market impact: The price movement caused by consuming several levels of the book with a larger order.
- Time sensitivity: News can change both the probability and the available liquidity while your order is waiting.
Ask the venue whether orders are executed by price and time priority, whether partial fills are possible, and how an unfilled order can be canceled. Use a limit order when controlling the worst acceptable price matters more than immediate execution; recognize that a limit order may never fill. A marketable order may fill quickly but at several prices.
Plan the exit before entry
The CFTC says that, rather than being locked in, customers can trade in and out before settlement at the then-current market price to lock in gains or limit losses. That statement describes the ability to seek an exit, not a favorable or immediate fill. The market may be thin, the spread may widen, or the price may move against you.
Write down an exit plan with a trigger, maximum acceptable loss and minimum acceptable price. Include what you will do if the event becomes more certain but the order book disappears, or if the settlement source is delayed. If you would be unable to tolerate holding through settlement, liquidity is a central part of your decision rather than an afterthought.
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Calculate the complete cost
Check the venue’s current fee schedule immediately before placing an order. Include every applicable transaction charge, settlement charge, withdrawal or funding cost, and any difference between the quoted and executable price. The available material does not establish a current, directly comparable fee table across venues, so do not assume that one platform’s pricing applies to another.
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Use an all-in expected-value test
For a $1 “yes” contract, a practical test is:
net expected value = (your probability × $1.00) − purchase price − expected fees − expected slippage
Suppose your probability estimate is 58%, the executable offer is $0.52, and you expect $0.02 per contract in combined fees and slippage. The apparent $0.06 edge before costs becomes $0.04 after those assumptions. If the estimate itself could reasonably be several percentage points lower, the edge may not justify the risk and effort. This is a decision aid, not a forecast guarantee.
Separate entry and exit costs
If your plan is to close before settlement, estimate costs twice: once to enter and again to exit. The exit price is unknown, so model a range rather than a single optimistic figure. Include the spread you may have to cross and the possibility that only part of the position can be sold at your target price.
Verify rules, regulatory status and access
Prediction-market access depends on the specific venue, contract, account type and jurisdiction. Confirm all four before depositing money. A regulatory status or permission in one location does not establish availability or identical protections elsewhere.
Questions to answer from current official pages
- Which regulator, if any, oversees the venue and the specific contracts?
- Is your country, state or territory eligible for an account and for this contract?
- What identity, age, funding and tax-related requirements apply?
- Where are customer funds held, and what happens if the venue is unable to operate?
- What rulebook governs the contract, and when can the venue amend it?
- How are settlement disputes, corrections and erroneous trades handled?
- What surveillance, position limits or trading restrictions apply?
The CFTC’s Economic Requirements materials provide regulatory context for listed contracts and exchange requirements. They do not replace the venue’s current customer agreement or tell you whether you personally may trade. Recheck regulator and venue pages on the day you trade because interpretations, litigation and access rules can evolve.
Screen for information, conflict and integrity risks
Do not trade when your information comes from a confidential or nonpublic source, or when your role gives you access to information about the subject of the contract. Also examine whether your own position, employment, clients or relationships could create a conflict that affects your judgment or violates venue rules.
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The CFTC Enforcement Division’s prediction-markets advisory describes enforcement concerns involving misuse of nonpublic information and fraud, including a trader affiliated with the subject of a contract. The advisory is a warning about market-integrity obligations, not a substitute for the specific rules that apply to your account.
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- Could a reasonable person view your information as confidential, restricted or obtained through a special role?
- Are you planning to influence the event, release information, or coordinate trades rather than express a genuine view?
- Does the venue prohibit trading by employees, contractors, officials, participants or people with a related interest?
- Can you preserve records showing how you formed your view without exposing protected information?
If any answer is uncertain, stop and obtain clarification from the venue or an appropriately qualified adviser. Passing is preferable to risking an account violation or market-manipulation allegation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Compare venues and contracts on the same axes
When more than one venue offers a similar event, compare the actual contract and execution conditions rather than the brand or headline price. The following framework keeps unlike features separate.
| Axis | Evidence to collect | Decision question |
|---|---|---|
| Definition and settlement | Full wording, source, deadline, edge-case rules | Can I explain exactly what produces a payout? |
| Regulatory status and access | Current regulator information, eligibility and account restrictions | Am I permitted to trade this contract from my location? |
| Rulebook and remedies | Amendment, dispute, correction and settlement procedures | Do I accept how disagreements and errors are resolved? |
| Liquidity | Bid, offer, spread and depth for my intended size | Can I enter and exit without unacceptable price movement? |
| Costs | Current fee schedule plus funding, settlement and slippage assumptions | Does the edge survive all-in costs? |
| Integrity controls | Restrictions, surveillance, position limits and conflict rules | Can I trade without violating a restriction or creating a conflict? |
There is no verified head-to-head measurement of execution quality or comparable fee schedule in the available material. Obtain those figures directly from each venue instead of filling the gaps with assumptions.
Use a repeatable pre-trade worksheet
- Copy the contract definition. Save the full text, settlement source, deadline and version or update date.
- List edge cases. Note cancellation, postponement, revision, tie, missing-data and correction provisions.
- Write an independent probability. Record your base rate, evidence, uncertainty range and the facts that would change your estimate.
- Capture executable prices. Record bid, offer, spread, visible depth and the size you intend to trade.
- Estimate total costs. Use the current fee schedule and a conservative slippage assumption for both entry and planned exit.
- Compute break-even. Compare your probability range—not just your midpoint—with the all-in break-even probability.
- Verify eligibility and rules. Check jurisdiction, account requirements, rulebook, disputes, corrections and position limits.
- Complete the integrity check. Confirm that your information is permissible and that no personal or professional conflict is involved.
- Set an order and exit plan. Choose order type, maximum price, position size, cancellation time and loss limit.
- Choose explicitly. Trade only if the contract is understood, the expected edge survives costs, execution is realistic and the rules are acceptable. Otherwise record “pass” and the reason.
Common failure modes and fixes
Trading the headline instead of the definition
Symptom: You discover after entry that the contract uses a different threshold, source or time zone than the headline suggested.
Fix: Require a completed settlement checklist before submitting an order.
Using the last trade as your entry price
Symptom: Your order fills only at a worse price or remains unfilled.
Fix: Inspect the live bid, offer and depth; decide in advance whether you will use a limit order or accept the cost of crossing the spread.
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Ignoring the exit
Symptom: You are directionally correct but cannot close near the price you expected.
Fix: Check depth for your full position and model a range of exit prices before entering.
Calling a gross edge a profit
Symptom: Fees and slippage consume most of the difference between your estimate and the quote.
Fix: Recalculate with all-in entry and exit costs and a deliberately conservative probability range.
Assuming one venue’s rules apply everywhere
Symptom: Your location is restricted, a contract is unavailable, or a dispute follows a procedure you did not expect.
Fix: Read the current rules for the exact venue and contract and verify eligibility immediately before trading.
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Symptom: Your view depends on a confidential workplace, client or official source.
Fix: Do not trade until you have established that the information and your role are permitted; when uncertain, pass.
When passing is the best decision
Pass when the event definition has unresolved ambiguity, the settlement source is unclear, your probability estimate is no better than the market’s after costs, the order book cannot support your size, or the venue’s rules and jurisdictional access are unacceptable. Also pass when you cannot explain how you would exit or when your information may be restricted. A checklist is a discipline for declining bad trades as much as for finding attractive ones.
Prediction markets can provide a way to express a view on a defined event, but no checklist guarantees a profitable outcome. Prices can be wrong, your estimate can be wrong, the event can resolve unexpectedly, and execution can differ from what was displayed. Treat the decision as a risk-managed assessment of a specific contract under current rules—not as a promise that an implied probability will come true.
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