Compare prediction market platforms one contract at a time. For the same event, check the full cost of entering a trade, the market’s liquidity, the exact settlement rules, and whether you can legally use that venue from your location. A platform-wide claim such as “lowest fees” or “most markets” is not meaningful unless the comparison uses matching contracts and trade assumptions on the same date.
What to compare before choosing a platform
Use the same event and the same hypothetical trade on each venue. A useful comparison separates what you pay to trade from what the contract promises if it settles in your favor.
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| Factor | What to inspect | How to compare fairly |
|---|---|---|
| Total trading cost | Transaction or trading fees, any other applicable charges, and the bid–ask spread. | Use the same contract, order size, price, order type, and assumptions about whether your order adds or takes liquidity. Record the date and time. |
| Market availability | The specific event, outcomes, and contract wording—not just the platform’s subject categories. | Compare contracts only when their outcome definitions, deadlines, and resolution sources match. |
| Liquidity | The spread, available quantity at quoted prices, and depth beyond the best bid and ask. | Take a time-stamped snapshot of the specific market. Liquidity can vary from one contract to another and over time. |
| Payout and settlement | What a winning position pays, who determines the result, when settlement occurs, and how delays, ambiguity, or voids are handled. | Read the rules for the individual contract; a platform’s general description may not cover its exceptions. |
| Eligibility and oversight | Which platform entity serves your location, its applicable rules, and any relevant custody or clearing arrangements. | Check the venue’s current terms and your local eligibility rather than assuming one brand operates under one set of rules everywhere. |
| Ability to exit | Whether you can trade out before settlement and whether the market has enough liquidity to do so at an acceptable price. | Check the market’s rules and current order book; an early exit is a trade at the available market price, not a guaranteed return. |
How to compare fees and the real cost of a trade
Separate fees from the spread
A posted fee is only one part of trading cost. The spread is the difference between the best price at which someone will buy and the best price at which someone will sell. If you buy at the ask and later sell at the bid, that gap can cost you even when the platform’s explicit fee is small. The price and quantity available also matter: a larger order may fill at several prices rather than at the best displayed quote.
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For a fair comparison, estimate the cost of the same trade on each venue using its current fee schedule and order book. Include any other charge that applies to that order or account. Do not compare one platform’s fee for a small order with another platform’s fee for a different size or order type.
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Do not assume one platform is cheapest
Kalshi’s Help Center said on March 17, 2026, that it earns revenue by charging a transaction fee based on a contract’s expected earnings and directed users to its fee schedule. The current detailed schedule figures were not available in the official material reviewed for this article, and there was no directly comparable current fee table for Polymarket. Check each venue’s official schedule before calculating a trade; the available information does not establish which platform is cheaper for a typical trade.
Likewise, a contract’s displayed price is a market price reflecting traders’ views, not a guaranteed or independently verified probability. It can move as orders arrive or information changes.
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How to check whether the markets are actually comparable
Match the contract, not just the topic
Two venues may list markets about the same event but ask different questions. Before comparing prices, check the exact outcome wording, the cutoff or deadline, the source used to determine the result, and the treatment of delayed, ambiguous, or cancelled events. If any of those differ, the contracts may not represent the same position.
Prediction markets can use binary yes-or-no contracts, multiple-choice outcomes, or range-based structures. A platform’s broad category list does not show whether it offers the particular contract you want, and complex contract formats may attract fewer participants and have lower liquidity.
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Look at the order book for the contract you care about
Compare the best bid and ask, the quantities available at those prices, and how much depth sits behind them. A narrow spread at a tiny quantity may not make a large trade inexpensive. Capture the figures with a timestamp because both prices and available liquidity can change quickly.
Market prices can help show what participants currently think, but they are not a promise about the outcome. A thin market may also make a displayed price less useful as a guide to what a larger order can execute at.
How payouts and settlement work
Read the contract’s resolution terms
The payout depends on the contract design and the final resolution, not simply on the headline question. A binary contract may have an all-or-nothing result, while a multiple-outcome or range-based contract may distribute value differently. Do not infer a universal payout from a platform’s generic explanation.
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Understand what happens before settlement
On CFTC-regulated markets, customers may be able to trade out of a position before settlement at the then-current market price, subject to market conditions. That price may be above or below what you paid, and there may not be enough liquidity to exit at the price you want. Selling before settlement is therefore different from receiving the contract’s final payout.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check location, platform entity, and risk
Access and rules can differ within a single brand. Polymarket’s own disclosures distinguish its U.S. and International platforms, which have separate terms and market-integrity rules. The disclosures say U.S. users are prohibited from using the International platform and describe the U.S. entity as a CFTC-designated contract market and clearing organization, fully launched since May 2026. These are the platform’s descriptions; verify current eligibility and terms for your location before opening or using an account.
Regulatory status does not remove trading risk. The CFTC advises customers to understand fees, risks, and rules and to trade only with risk capital. It also warns that users may have little or no protection when dealing with unregistered entities operating outside the United States.
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A practical comparison process
- Choose the event. Find the exact contract on each platform. If outcome wording, deadline, or resolution source differs, mark the contracts as non-equivalent rather than comparing their prices as if they were interchangeable.
- Check access. Confirm which entity operates the venue for your location and whether its current terms allow you to trade that contract.
- Read the rules. Record the winning condition, payout, resolution authority, settlement timing, and treatment of delays, ambiguity, or voids.
- Capture market conditions. At a recorded date and time, note the bid, ask, quantities, and visible depth for the contract.
- Calculate the same trade. Apply each venue’s current official fees to an identical order size, price, and order type, then account for the spread and any other applicable charge.
- Compare the outcome that matters to you. Consider whether you need the contract to be available, whether you may want to exit early, and whether the cost and settlement terms fit your needs. Recheck live details before trading because fees, listings, liquidity, and eligibility can change.
Bottom line
The most useful platform comparison is a dated, contract-level comparison—not a ranking based only on fee headlines or market counts. Match the contract terms, estimate fees and spread for the same trade, inspect liquidity, and verify location-specific access before treating two venues as comparable.
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