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Polymarket vs Kalshi vs GADUIN
Polymarket, Kalshi and GADUIN all list event contracts that pay $1.00 per share on the outcome that happens, but they differ in focus, fees and access. Polymarket and Kalshi cover politics, sport, economics and culture with published taker fees; GADUIN lists transport only and charges no trading fee.
| Topic | Polymarket | Kalshi | GADUIN |
|---|---|---|---|
| Markets listed | PolymarketPolitics, sport, crypto, finance, economics, culture, weather, tech and geopoliticsSource | KalshiElections, politics, sport, culture, crypto, commodities, climate, economics, finance, and tech and scienceSource | GADUINTransport only: individual flights, trains, ship voyages, daily airport arrivals and weekly chokepoint transitsSource |
| Outcome style | PolymarketYes/No: each market has two outcome tokensSource | KalshiYes/No contractsSource | GADUINYes/No, plus three-outcome On time / Delayed / Cancelled marketsSource |
| How trades are priced | PolymarketTraders post orders and are matched with each other (makers and takers)Source | KalshiTraders post orders and are matched with each other (makers and takers)Source | GADUINA fixed pricing formula that moves with every tradeSource |
| Trading fees | PolymarketTakers pay shares × rate × p × (1 − p); the rate runs from 0.04 to 0.07 by category, geopolitics markets are fee-free and makers pay nothingSource | KalshiMost markets: takers pay 0.07 × contracts × p × (1 − p), rounded up; some series also charge resting (maker) orders; no settlement feeSource | GADUINNo trading fee and no settlement feeSource |
| Balance currency | PolymarketpUSD, a USDC-backed token on PolygonSource | KalshiUS-dollar cash balanceSource | GADUINUSDT balanceSource |
| Account funding | PolymarketCrypto transfer to your deposit address, from a choice of tokens and networks; no Polymarket deposit or withdrawal feeSource | KalshiDebit card, bank transfer (ACH), PayPal, Venmo, Cash App, crypto and wire; outside the US: debit card, crypto and wireSource | GADUINUSDT (ERC-20) on Ethereum; no GADUIN deposit feeSource |
| Regulatory status, as stated by the operator | PolymarketPolymarket US (QCX LLC) is a CFTC-regulated designated contract market; the international platform restricts access by country for regulatory and sanctions reasonsSource | KalshiRegulated by the CFTC as a designated contract market (DCM)Source | GADUINOperated by Gaduin Inc., Panama; not registered with or licensed by any securities or derivatives regulatorSource |
| Availability | PolymarketThe international platform blocks 39 countries, including the US, UK, France, Germany and Australia, plus some regions; Singapore, Poland, Thailand and Taiwan are close-onlySource | KalshiThe US and many other countries, subject to the Kalshi Member AgreementSource | GADUINNot available to US persons or to residents of restricted jurisdictionsSource |
Which one fits what you want to trade?
If you want politics, sport, economics or culture, Polymarket and Kalshi list far more of it. If you want to trade whether a specific flight lands on time, whether a train runs late or how many ships cross Hormuz this week, that is exactly what GADUIN lists, and nothing else. GADUIN is not available to US persons.
Fees on a 50¢ trade, worked
Take 100 shares at 50¢, $50.00 of positions, bought as a taker, using each operator's published formula:
| Market | Fee |
|---|---|
| Polymarket, politics market (rate 0.04) | $1.00 |
| Polymarket, sports market (rate 0.05) | $1.25 |
| Kalshi, standard market | $1.75 |
| GADUIN, any market | $0.00 |
Orders that wait to be matched pay no fee on Polymarket and on most Kalshi markets, and Polymarket's geopolitics markets are fee-free.
How each settles
All three pay $1.00 per share on the outcome that happens and $0 on the rest. Polymarket and Kalshi resolve each market under its own published rules. GADUIN fixes every market's terms (the exact service, the reference time and the delay threshold) when it opens and settles from the official operational record. See how GADUIN settles.
Availability by country
Each operator decides where it serves. Polymarket publishes a list of blocked and close-only countries; Kalshi sets eligibility in its Member Agreement; GADUIN is not available to US persons or to residents of restricted jurisdictions. Check the operator's current terms and your local laws before opening an account.
Polymarket and Kalshi are trademarks of their respective owners, and GADUIN is not affiliated with either. Each description summarises the operator's own published pages on the date above.
Trade the transport question
Every GADUIN market shows its price as a chance and what a share pays out, with no trading fee on top.