Polymarket, Kalshi, Limitless, Predict.fun and OPINION differ in access, fees and the contracts they list. Start with the exact outcome rule and executable price: two similar questions can settle differently.
This comparison covers Polymarket International, Kalshi, Limitless, Predict.fun and OPINION. It examines what you trade, how costs are applied and which access or referral conditions need checking. “Best” here means fit for a particular eligible user and market, rather than one universally available winner.
Referral disclosure: W3Match may earn commissions or other rewards from links marked Referral. Location and offer eligibility still apply. A referral bonus isn't guaranteed income, and a points program isn't a cash rebate.
Documentation was reviewed on October 13, 2026. These products can fall under financial, gaming or other jurisdiction-specific rules. This is an international comparison, not a list of platforms approved for trading throughout Europe.
Start with the contract and the country
| Platform | What to compare | Access or program detail |
|---|---|---|
| Polymarket International | Onchain outcome markets, category-specific fees and resolution | Separate from Polymarket US; many jurisdictions restricted |
| Kalshi | Exchange-listed event contracts and market-specific fee terms | US CFTC oversight doesn't create universal foreign access; referral offers currently US-only |
| Limitless | Short-duration and other listed outcome markets | Check product terms, resolution and current fee model |
| Predict.fun | BNB Chain markets and order-book pricing | Website and Binance Wallet referral programs are distinct |
| OPINION | Economic and other outcome markets | Taker fee floor can dominate a small order |
The cheapest visible share isn't automatically the cheapest exposure. Compare the same outcome, settlement source, deadline and executable size before computing a price difference.
From a prediction-market order to resolution and redemption
The full lifecycle includes the question’s rules and the process that determines the outcome.
1. Polymarket: separate International and US
Polymarket International / REFERRALPolymarket InternationalCompare outcome markets through an onchain order-book route.Read the exact resolution rule and fee category. Restricted locations cannot open new positions.Pawnie’s referral link
Polymarket product facts
| Field | Detail |
|---|---|
| Execution | Signed orders on a central limit order book |
| Settlement | Current trading documentation describes settlement on Polygon using pUSD and outcome tokens |
| Price protection | The signed order specifies price and size before submission |
| Outcome process | Predefined market rules determine resolution; the linked help page describes an optimistic-oracle process |
| Final payout | Under a normal binary resolution, winning shares pay $1 and losing shares become worthless |
Current trading workflow, resolution help.
Older guides can mention different collateral names or settlement versions. For a current funding step, use the account’s current deposit instructions. For outcome research, quote the contract’s actual resolution source and deadline rather than paraphrasing only the headline.
Polymarket describes an international blockchain-based platform and a separate US-regulated exchange. The international site's market availability and referral program shouldn't be inferred from the US product's rules. Platform distinction.
Current fee documentation describes taker charges varying by market category and share price, with maker fees at zero and some categories fee-free. A blanket “Polymarket has no fees” description is stale. The published formula uses share count, a category coefficient and p × (1 − p). Trading fees.
The international geographic page contains a blocked-country list alongside close-only exceptions. Its Poland example permits viewing data and closing positions, not opening new ones. Check the exact current rule rather than treating an accessible website as permission to trade. Geographic restrictions.
Its reviewed referral program requires the referrer to have $10,000 lifetime trading volume before earning referral rewards and sets attribution conditions. That is not a promised signup bonus for the reader, and a link does not remove jurisdiction rules. Referral program.
2. Kalshi: the exchange and the offer differ
Kalshi / REFERRALKalshiCompare exchange-listed event contracts.Contract rules and market fees apply. The reviewed referral offer is for eligible US users only.Pawnie’s referral link
Kalshi product facts
| Field | Detail |
|---|---|
| Product reviewed | Exchange-listed event contracts, not every other Kalshi product |
| Account model | Account/security and funding workflows are handled through the exchange |
| Cost source | Use the event-contract fee schedule and contract-specific terms |
| Legal scope | US oversight does not establish every foreign reader’s trading eligibility |
| Referral scope | The reviewed program offer is limited to eligible US users |
Account, funding and trading resources, event fee schedule.
A research comparison can include Kalshi even when a particular reader cannot claim its referral offer. The useful details are the exact event rule, deadline, order-book spread and permitted account route. These answer different questions from the promotion page.
Kalshi is subject to US CFTC oversight. That gives the trading product a different operating framework from a permissionless wallet interface. Account eligibility, identity checks and current contract availability still need inspecting. Kalshi help and regulatory resources.
Trading fees depend on the schedule and market. A useful comparison checks what a fill costs at the intended share price and size, including any resting-order treatment. A generic “regulated” label does not tell you the executable spread. Current fee schedule.
The current referral FAQ says offers are available only to eligible US users. It also distinguishes cash or account credits, qualifying actions, offer limits and withdrawal restrictions. European readers shouldn't be promised the same reward because a US user shared a code. Referral FAQ.
Kalshi remains relevant to a market-structure comparison, with its US referral eligibility stated beside the link. Funding and trading access must be checked separately from earning the offer.
3. Limitless: read the exact time window
Limitless / REFERRALLimitlessTrade hourly and daily price-outcome markets on Base.The documented YES/NO pair is collateralised by 1 USDC; read the exact observation window.Pawnie’s referral link
Limitless product facts
| Field | Detail |
|---|---|
| Network | Base in the current product introduction |
| Market focus | Continuous hourly/daily crypto and stock-price outcome markets |
| Quote convention | Documentation describes shares priced from 0.01 to 0.99 USDC |
| Collateral unit | A YES/NO pair is described as fully collateralised by 1 USDC |
| Resolution payoff | Winning shares pay 1 USDC; losing shares have no value after resolution |
For a short-duration price market, the price feed and observation timestamp are part of the product. Compare those fields with a longer-horizon event contract before interpreting a lower share price as better value. The two contracts may be answering different questions.
Limitless's materials describe prediction-market products with a fee and resolution design of their own. Short-duration price markets need particular attention to the reference source, start/end times and the conditions that define a winning outcome. Limitless documentation.
Its published whitepaper distinguishes AMM and order-book fee approaches. A historical launch post shouldn't be treated as a universal current quote for every market type. Inspect the live order and applicable schedule. Fee model.
Limitless also has an affiliate application route for creators and community operators. Having that page available doesn't establish that an applicant was accepted or that every referred trader qualifies for the same benefit. Affiliate program.
For a trader, the distinction between an event market and a rapid price market matters more than a platform-wide fee headline. Compare the actual contract you expect to hold.
4. Predict.fun: the referral route matters
Predict.fun / REFERRALPredict.funPlace maker orders with no maker fee.The documented minimum order is 1 USDT; taker charges vary with share price.Pawnie’s referral link
Predict.fun product facts
| Field | Detail |
|---|---|
| Maker fee | 0 in the reviewed fee page |
| Minimum order | 1 USDT |
| Taker pricing | Variable with share price and applicable discount; not one flat percentage |
| Published example | The table’s 100 shares at 0.50 have 50 USDT trade value and 1 USDT undiscounted fee |
| Program route | Website and Binance Wallet referral attribution are separate |
Predict fee and minimum-order table.
The published midpoint example makes the denominator visible: 1 USDT on 50 USDT is 2% of trade value. Compare that cost with another venue using the same outcome, share price and size. Do not transfer a Binance Wallet rebate promise to a website link.
Predict describes prediction markets on BNB Chain. Its fee page lists no maker fee, variable taker fees tied to share price and a minimum order size. That is a different cost model from applying one flat percentage to every outcome purchase. Predict fees.
Its September 14, 2026 announcement describes a Binance Wallet referral program with distinct activation and reward conditions. Trades through the website use the website's separate program. An offer from one route shouldn't be pasted next to a link opening the other. Binance Wallet program.
Market resolution also needs a direct source and dispute process. Yield-related features, where offered, add dependencies rather than making an uncertain contract outcome safe.
Choose the website or Binance Wallet route deliberately; program attribution differs.
5. OPINION: the minimum fee changes small trades
OPINION product facts
| Field | Detail |
|---|---|
| Maker fee | 0 in the reviewed documentation |
| Minimum ticket | 5 dollars in the fee documentation |
| Taker curve | Probability-dependent; the floor still applies |
| Minimum fee | 0.25 dollars minimum taker fee; verify how partial fills are charged |
| Discount boundary | A fee discount does not remove the minimum charge |
For small orders, report the fee in dollars alongside the percentage. A minimum charge can dominate the headline curve. The documentation assesses fees per matched fill. Partial fills or several orders may therefore change the total minimum-charge effect; inspect the execution quote instead of assuming one submitted order always means exactly one floor.
OPINION's documentation describes maker-free trading and a probability-dependent taker fee, with a $5 minimum order and $0.25 fee floor. It explains that discounts don't remove the minimum. OPINION fees.
The arithmetic is worth noticing. A $0.25 fee on a $5 order equals 5% of that order's value, even if the headline curve is described as reaching one percent. Small trades need the fee floor in their comparison.
The program documentation describes referral codes and reader fee discounts, while the fee page states a referrer incentive linked to paid fees. The effective discount can still be limited by the floor. Referral program.
This is a useful candidate to inspect for its listed markets, with the minimum-cost effect kept visible rather than buried beneath a percentage promise.
A probability price isn't a free statistic
A YES share quoted near 0.60 can be interpreted in probability terms under a simple binary-market model, but your trade also pays a spread and applicable fees. A thin or incentive-distorted market can make the displayed number less informative than it looks.
Before using the price, read which source determines the outcome and how disputes work. “Will a company launch this year?” can depend on what counts as a launch and which time zone applies. A different definition creates a different asset.
Check the exit as well. Being correct eventually doesn't guarantee that you can sell at a favorable price before resolution. Capital can remain tied up while a dispute or verification process runs.
Compare cost on the same basis
Polymarket's crypto-category formula, for example, produces a $1.75 fee for 100 shares bought at $0.50 under the reviewed coefficient. The trade value is $50, so the fee is 3.5% of the money spent. A coefficient of 0.07 doesn't mean a universal 7% charge on every trade's dollar value.
OPINION's floor shows another effect: a small ticket can have a higher effective percentage than its curve headline suggests. The calculator uses each formula's own denominator and labels illustrative inputs rather than pretending all markets have the same schedule.
Maker status also depends on how an order executes. A limit order crossing the book can be a taker order. Posting a price doesn't guarantee you receive a fill or avoid all costs.
Choose an eligible market, then a platform
Start with legal and product access, the exact resolution rule and an executable quote. Then check trading costs and the applicable referral program. Comparing promotional credits first can lead you to a product you can't use or a contract you didn't intend to buy.
For perpetual price exposure, use the perp DEX shortlist. For EU spot accounts, use the MiCA platform comparison. Neither category gives automatic authorization to trade event contracts.
Questions this comparison answers
Is a 60-cent YES share exactly a 60% probability?
That is a useful binary-contract interpretation, not a guarantee. The executable bid/ask, fees, market depth and precise resolution rule determine what the quoted price means for an actual trade.
Why can the same question have different prices on two platforms?
Different deadlines, data sources, settlement rules, access restrictions and executable depth can create different contracts. A lower headline price is not enough to establish an arbitrage.
Research scope and dates
Product fact tables and additional operational details reviewed October 15, 2026. Earlier regulatory snapshots and saved referral observations retain the dates stated beside them. The comparison uses primary documentation, not a funded execution test; a missing verified value is left unassigned rather than inferred from another platform.
A 60-cent entry can need more than 60% confidence
In a fictional binary contract paying $1 for a winning share and $0 for a losing one, buying 100 YES shares at $0.60 costs $60. If the all-in entry charge is another $1.50, the total outlay is $61.50. Holding to an undisputed resolution would require a win probability above 61.5% for positive expected value under this simplified model.
That calculation ignores capital lock-up, payout timing, taxes and additional charges. The $1.50 is an assumed example, not any platform's fee quote. A displayed probability and a profitable entry are different quantities once costs enter the trade.