Polymarket vs Kalshi: How the Two Prediction Markets Differ
Guide · 4 min read · published 2026-07-25 · updated 2026-07-25
Polymarket and Kalshi are the two names that come up whenever prediction markets are discussed. They look similar - buy a contract, get $1 if you are right - but almost everything underneath is different.
Regulation and access
Kalshi is a CFTC-regulated designated contract market. It operates inside the US regulatory perimeter, onboards users with standard KYC, and settles in dollars held with a clearing organisation.
Polymarket is crypto-native. You trade from a self-custodied wallet against an on-chain order book, with collateral in pUSD. There is no account balance held by a broker - the position is a token in your wallet. Availability depends on where you are; check the platform's own terms rather than a blog post, including this one.
Market selection
Kalshi's catalogue leans toward economic and structured events: inflation prints, Fed decisions, weather, elections, company metrics. Every contract goes through a regulatory approval process, which keeps the list tighter and slower to expand.
Polymarket lists faster and wider. Alongside elections and Fed decisions you get AI model releases, award shows, geopolitical flashpoints and short-dated crypto contracts that settle within the hour. A news story on Monday can be a market on Monday.
Liquidity
Compare per market, not per platform. Polymarket's headline events - a US presidential race, a major conflict question - carry depth measured in millions and spreads of a cent or less. Its long tail is thin, and a single trader can move a small market several points.
Kalshi concentrates volume in fewer contracts, so its economic markets are often competitive with Polymarket's equivalents even though the totals differ. The practical test is the same on both: look at the order book before you size a position.
Fees
Kalshi charges a trading fee on a published schedule. Polymarket charges takers in crypto and sports categories and, at the time of writing, nothing in politics and world events - see the fee breakdown. On both platforms the spread usually costs more than the fee.
Settlement
Kalshi settles to your account balance in dollars. Polymarket settles on-chain: winning shares redeem for $1.00 of pUSD, which you can hold, redeploy or bridge out. That difference matters most if you care about custody - on Polymarket nobody can freeze a position that already sits in your wallet, and equally nobody can recover it for you.
Interface and tooling
Kalshi feels like a brokerage: an account, a balance, a familiar order ticket. Polymarket feels like a DeFi application: a wallet connection, on-chain positions, and an ecosystem of third-party analytics built on public data.
That last difference is underrated. Because every Polymarket position is a token on a public ledger, anyone can build on top of it - which is why wallet-level leaderboards, whale tracking and position history exist here and largely do not on the regulated side. You can look up any wallet's full trading record; you cannot look up another Kalshi user's account.
Resolution and disputes
Kalshi resolves contracts itself, under regulatory supervision, against the sources named in the contract specification. Complaints have a formal channel.
Polymarket settles through an oracle with an economic dispute process: outcomes can be challenged, and the challenge is resolved by a mechanism rather than by customer support. In practice both work almost always, and both occasionally produce a result some traders consider wrong - usually because the written rule and the intuitive reading of the question diverged. On either platform, reading the resolution text before trading is the actual protection.
Which one fits
- You want US regulatory protection and dollar settlement - Kalshi is built for that.
- You want breadth, speed and self-custody - Polymarket lists more, lists faster, and never holds your funds.
- You want the widest range of questions - Polymarket, by a wide margin, particularly outside economics.
- You want public, auditable trading data - only Polymarket offers it, because the positions are on-chain.
- You care about a specific question - check both. Prices on the same event do drift apart, and that gap is itself a trade for anyone with accounts on both. See cross-venue arbitrage.
What both get right
Whatever the differences, the core idea is the same and it is a good one: a market price is a forecast with money behind it, updated continuously, and testable after the fact. Both platforms produce numbers that have generally held up better than punditry - which is why newsrooms increasingly quote them.
Tracking the Polymarket side
Polynter covers the Polymarket side: live odds on every market, the trader leaderboard, whale positions, near-certain markets and yield pages. It is independent of both platforms and holds no funds. If you are new to the mechanics, start with what Polymarket is; for costs, see the fee guide.