Kalshi vs Polymarket: which prediction market fits you?
For a US trader who wants dollar-denominated event exposure — economic data especially — Kalshi is the straightforward venue: a CFTC-designated contract market since 2020, with a written settlement rule per market and segregated customer funds. Polymarket is now two products: a separate CFTC-regulated US exchange launched in late 2025 on an acquired license, with a narrower, sports-led list, and the original crypto-native international platform, which has the widest menu and the deepest headline liquidity but settles by decentralized oracle and is geoblocked for US users. Disclosure: we integrate with Kalshi and with neither Polymarket product.
Quantreno Research · Updated July 26, 2026
Kalshi and Polymarket are the two prediction markets most traders end up choosing between, and the split inside the second name is what dates most comparisons: Polymarket US and the crypto-native international platform are separate products with separate regulators, market lists, and resolution mechanics, and only one of them is open to US traders. Disclosure up front: Quantreno integrates with Kalshi (our users trade it through their own accounts); we don't integrate with either Polymarket product. We've tried to keep the comparison honest anyway — Polymarket is genuinely better on some axes, and we say so.
The comparison at a glance (as of mid-2026)
| Kalshi | Polymarket US | Polymarket Intl | |
|---|---|---|---|
| Regulation | CFTC-designated contract market (DCM) since 2020; US-regulated end to end | A separate CFTC-designated exchange (QCX, acquired 2025; launched Dec 2025) — full KYC | Offshore since a 2022 CFTC settlement; geoblocked for US users |
| Currency & custody | US dollars in a regulated exchange account; segregated customer funds | US dollars through regulated intermediaries; fully collateralized contracts | USDC stablecoin on-chain — self-sovereign wallets, smart-contract custody |
| Resolution | Written rulebook per market; a named settlement source; exchange settles | Exchange-rule settlement under CFTC oversight | Decentralized oracle (UMA): a bonded answer anyone can dispute — fast and usually right, occasionally contentious |
| Market breadth | Hundreds of live events — strongest in econ data, Fed, politics, weather | Narrower, sports-led list so far | The widest menu and fastest to list the viral question; deep liquidity on headline geopolitics and elections |
| Costs | Trading fee scaling with price, charged once per order (published schedule) | Own fee schedule — check current terms | No per-trade exchange fee historically; costs live in the spread and on-chain frictions |
| Recourse | US legal recourse; a regulator with jurisdiction | US legal recourse; a regulator with jurisdiction | Your recourse is the protocol |
Where each one is genuinely stronger
- Polymarket International, for breadth and speed. It lists the question everyone is arguing about, fast, and its headline markets often carry enormous liquidity. If your interest is trading global news flow the moment it breaks, it earns its reputation — but as a US resident you can't lawfully trade it; the US product carries a much narrower, sports-led list so far.
- Kalshi, for the boring things that matter with real money. Dollars in, dollars out; a regulator with jurisdiction; a written settlement rule you can read before you trade; no oracle-dispute tail risk. Its economic-data markets (CPI, Fed decisions, jobs) are also simply the better-structured product — full threshold ladders that support relative-value trading, not just one headline question.
The decision, by trader
If you're US-based and want event exposure inside a normal, taxable, dollar-denominated account — or you specifically trade economic data — Kalshi is the straightforward choice today; Polymarket US is the regulated alternative, with a narrower list. If you're outside the US, comfortable on crypto rails, want the widest menu of questions, and accept oracle resolution as the trade-off, Polymarket International is a real venue, not a toy. Plenty of serious traders watch both books: two liquid venues pricing the same event are a free sanity check on your own probability — and when they disagree materially, that disagreement is itself information (our guide to Kalshi arbitrage and its limits covers why acting on it is harder than it looks).
One thing neither venue gives you
Discipline. Both platforms make it equally easy to buy a contract on a hunch, size it by feel, and hold it with no exit plan. Whichever venue you pick, the work that separates trading from gambling — researching the catalyst, writing down the thesis, sizing to your edge, knowing what would make you wrong — is on you. Quantreno puts that whole loop on top of a Kalshi account you control: researched recommendations with stated reasoning, Kelly-based sizing, and your confirm on every order.
Frequently asked questions
- Can US traders use Polymarket?
- They can use Polymarket US, a separate CFTC-designated exchange launched in December 2025 on the acquired QCX license, funded in dollars through regulated intermediaries with full KYC — its market list is narrower and sports-led so far. The original international platform has been offshore since a 2022 CFTC settlement and is geoblocked for US users; that is the venue with the widest menu and the deepest headline liquidity. Any comparison treating Polymarket as one product is out of date.
- Which is cheaper, Kalshi or Polymarket?
- The costs are shaped differently rather than one being uniformly lower. Kalshi charges a trading fee that scales with contract price under a schedule it publishes; Polymarket US runs its own published schedule; the international platform has historically charged no per-trade exchange fee, with costs living in the spread and in on-chain frictions instead. Since a fee that scales with price is largest near 50¢ and small at the extremes, which venue is cheaper depends on the market and the size you trade — check the current schedules rather than a general claim.
- How do Kalshi and Polymarket resolve their markets?
- Kalshi settles each market from a written rulebook naming the settlement source in advance, with the exchange settling under CFTC oversight, and Polymarket US settles by exchange rule under the same regulator. The international platform uses a decentralized oracle — UMA — where resolutions are proposed with a bond and can be disputed and voted on. That process is fast and usually right, but it is occasionally contentious, and it is a genuinely different risk from a rulebook you can read before you trade.
- Which one has more markets?
- The international Polymarket platform lists the widest menu and is fastest to put up the question everyone is arguing about, with enormous liquidity on headline geopolitics and elections. Kalshi runs hundreds of live events, strongest in economic data, Fed decisions, politics, and weather, and its economic markets carry full threshold ladders rather than a single headline question — which is what makes relative-value trading between related contracts possible. Polymarket US is the narrowest of the three so far.
More on prediction markets
Examples on this page are simplified and assume the stated execution prices, fees, and settlement rules. Displayed market prices may not be executable at the size you want; fees, spreads, partial fills, and rule interpretation can eliminate an apparent edge. Market prices are not guaranteed probabilities.