Same headline, different market. Here's why these two major prediction platforms sometimes disagree — and what that means before you place a trade.
Platforms
2
Categories
6
Winner
Depends
Read Time
12 min
The regulated U.S. exchange
The broader global venue
Five places where Kalshi and Polymarket take meaningfully different approaches.
Rule-based resolution inside a regulated exchange structure.
Resolution depends on the specific Polymarket venue and its published rules.
U.S.-regulated event contracts across headline-driven categories.
U.S. regulated venue plus a separate international product with broader coverage.
Activity is highly event-driven.
Activity is also event-driven and split across U.S. and international venues.
USD-native onboarding with a more traditional exchange feel.
Different onboarding paths depending on whether you use the U.S. venue or the international product.
Published formula-based fee: up to 1.75¢/contract at 50¢ odds, less for longshots/favorites. Entry only — exiting is free. Politics/policy markets are free. In plain English: the closer to a coin flip, the more you pay, but it maxes out at under 2 cents.
Fee structure updated March 30, 2026. Geopolitics/world events: $0. Sports: up to ~0.75% at 50¢; Crypto: up to ~1.80% at 50¢; Politics/Finance/Tech: up to 1.00%. On Polymarket US (regulated venue): probability-based taker fee peaking at 0.75% peak for sports. Limit order makers get rebates, never pay fees.
The fee structures in plain English, with concrete examples.
Formula: 0.07 × P × (1 − P) per contract
Kalshi's fee scales with uncertainty. At 50/50 odds, you pay the max — 1.75¢ per contract. At 80¢, it's about 1.12¢. At 10¢, it's about 0.63¢. At 95¢, it's about 0.33¢.
Dollar example: Buy 100 contracts at 50¢ = $1.75 total in fees. Entry only — selling or exiting is free. Politics and policy markets: zero fees.
Geopolitics/world events: $0. Sports: up to 0.75% at 50¢. Crypto: up to 1.80% at 50¢. Politics/Finance/Tech: up to 1.00%.
As of March 30, 2026, geopolitics and world events remain free. Sports can run up to 0.75% at 50¢ at 50/50 odds, and crypto can run up to 1.80% at 50¢.
Polymarket US venue (CFTC-regulated): Flat 0.75% peak taker fee — 30 cents per $100 traded. Place a limit order instead and you get 20 cents back per $100.
How each platform settles markets depends on the category. Compare settlement sources, timing, and gap risk.
This is not theoretical. Each case below shows a real market where Kalshi and Polymarket could reasonably end up with different outcomes.
Kalshi resolves markets under its own published specifications and exchange procedures.
Polymarket outcomes depend on the specific market's published resolution method.
Lesson: Do not assume two markets on the same headline will resolve identically across platforms.
Neither platform is better across the board. The right choice depends on what you value most.
A side-by-side look at the features that matter most.
| Feature | Kalshi | Polymarket |
|---|---|---|
| Regulatory Status | CFTC DCM + DCO | CFTC DCM (Polymarket US) |
| Resolution Method | Exchange rules and published specifications | Venue-specific published procedures |
| Crypto Wallet Required | No | Depends on venue and funding path |
| Mobile App | App support available | App / web support depends on venue |
| US Access | Federally regulated, with some state disputes | Yes (via QCX LLC) |
| Minimum Trade | $1 | $1 |
| Deposit Methods | ACH, wire, debit card, crypto options documented by Kalshi | Varies by venue and current product flow |
| Market Categories | Broad regulated event categories | Broader internationally; narrower on the U.S. venue |
| Best For | Traditional finance users | Deep liquidity seekers; fiat and crypto users alike |
| Settlement Disputes | Some high-profile disputes have drawn scrutiny | Check venue-specific history and rules |
| API Access | REST API (free) | Gamma API (free) |
| Trading Fees | Formula-based: ≤1.75¢/contract (formula-based) (max at 50/50 odds). Free to exit. Politics/policy free. | Updated Mar 30 2026. Geopolitics $0. Sports up to 0.75% at 50¢; Crypto up to 1.80% at 50¢; Politics/Finance/Tech up to 1.00%. Polymarket US: 0.75% peak sports peak. |
| Founded | 2018 | 2020 |
| Headquarters | New York, NY | New York, NY |
Compare real-time Kalshi and Polymarket prices side by side. See where the platforms diverge before you assume a price gap means easy money.
See live cross-platform marketsVolume is event-driven and changes constantly. Check live data if you need current numbers. In practice, strength varies by category, contract, and moment.
Because the contracts and resolution methods can differ. Kalshi resolves under its exchange rules and published specifications. Polymarket depends on the venue and that market's published resolution process. If the wording is ambiguous, the outcomes can diverge.
Both have U.S.-regulated paths, but availability can depend on the specific product and current legal posture. Check the live onboarding terms before assuming access.
Neither is FDIC-insured. Kalshi has the longer-established U.S. regulated exchange footprint; Polymarket also has a U.S. regulated venue through QCX LLC d/b/a Polymarket US. Read the current transfer, custody, and rule documents before funding either one.
No. Prices can diverge because the venues have different trader bases, liquidity, and sometimes different contract wording.
Many active traders do. Using both gives you broader market coverage, better price comparison, and a fallback if one platform lacks the market you want. The tradeoff is extra complexity: more accounts, more funding paths, and two different rulebooks.
See where exchanges, wrappers, routers, perps rails, and intelligence layers differ before comparing brands.
Perpetuals Launch MapBoth platforms announced crypto perpetual futures on Apr 21, 2026 — this page compares their existing event-contract products.
Cross-Platform MarketsLive prices across venues.
Kalshi Legal WarThe full controversy timeline and legal disputes.
Settlement GuideHow prediction market contracts resolve.
Arbitrage TrackerReal-time cross-platform price gaps.
Sources: CFTC regulatory filings, Kalshi and Polymarket public documentation, CFTC records, Reuters reporting on Polymarket's U.S. return, and other public platform materials. Last updated April 2026. PredictionMarkets.us is not affiliated with either Kalshi or Polymarket.
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