Kalshi vs Polymarket: Which Should You Use?

Choose Kalshi if you want a CFTC-regulated exchange, USD bank funding, and straightforward US access. Choose Polymarket if you want the broadest global event coverage and deep headline-market liquidity, and you are comfortable operating on crypto rails — and can legally access it where you live. Kalshi is the default venue for most US-based traders today, while Polymarket's 2025 acquisition of a CFTC-licensed exchange means its US story is actively changing. Serious event traders end up watching both, because the venues frequently disagree — and that divergence is information.

How do Kalshi and Polymarket compare at a glance?

	Kalshi	Polymarket
Regulation	CFTC-regulated designated contract market (DCM)	Crypto-native; restricted US users after a 2022 CFTC settlement; acquired CFTC-licensed QCEX in 2025
Funding	US dollars via bank transfer and other fiat rails	USDC stablecoin on crypto rails (Polygon)
US access	Yes, though some state regulators have challenged its sports contracts	Historically restricted; a regulated US path has been emerging — check current terms
Coverage	Economics, politics, weather, sports, culture	Politics, geopolitics, crypto, sports, culture — broad and global
Fees	Explicit per-contract trading fees	Historically little to no explicit trading fees; costs live in spreads and on/off-ramps
Liquidity	Deep in recurring economic markets and flagship political contracts	Historically deepest on major political and global headline markets
Settlement	Exchange rulebook with defined sources, under federal oversight	UMA optimistic oracle with a challenge-and-dispute process
Best for	US traders who want bank rails and a regulated venue	Global traders who want breadth and crypto-native access

Both platforms trade binary event contracts priced between zero and one dollar, where price reads as an implied probability. If that framing is new to you, start with our prediction markets guide — the rest of this comparison assumes it.

How are Kalshi and Polymarket regulated?

Regulation is the deepest structural difference between the two venues, and it drives almost everything else: funding, access, coverage, and how disputes get resolved.

Kalshi: a CFTC designated contract market

Kalshi operates as a designated contract market regulated by the US Commodity Futures Trading Commission — the same federal agency that oversees futures exchanges. That means a formal rulebook, federally supervised operations, and contracts that exist inside the US regulatory perimeter. It also means Kalshi's coverage has expanded through regulatory and legal channels rather than around them: the exchange began listing US election markets after a 2024 federal court ruling went its way, and its later push into sports event contracts drew challenges from several state gaming regulators, a fight that was still working through the courts. The practical takeaway for a trader: Kalshi's menu is shaped by what a regulated exchange can list, and it grows in step with legal outcomes.

Polymarket: crypto-native, with a US path in progress

Polymarket grew up outside that perimeter. It is a crypto-native platform where positions are collateralized in USDC and recorded on-chain, and it built the deepest event markets in the world on global politics and news while formally restricting US users — a restriction that dates to a 2022 settlement with the CFTC. In 2025, Polymarket acquired QCEX, a CFTC-licensed exchange and clearinghouse, a move widely read as the foundation for regulated US re-entry, and it later drew significant investment from established financial players. How fully that translates into open, regulated US trading is a moving target; treat any claim about Polymarket's current US status as something to verify against the platform's own terms, not something to assume from an article — including this one.

How do deposits and withdrawals work on each platform?

Kalshi runs on fiat rails. You fund an account in US dollars from a bank, trade in dollars, and withdraw dollars. For anyone who already has a US bank account, this is the lowest-friction path in the category — no wallets, no bridging, no stablecoin conversion.

Polymarket runs on crypto rails. Collateral is USDC on Polygon, so funding means either depositing crypto you already hold or converting fiat through an on-ramp. If you're crypto-native, this is a feature: near-instant transfers, self-custody options, and no bank in the loop. If you're not, it's a real onboarding hurdle and a real cost — on-ramps, off-ramps, and stablecoin conversion all add friction that never shows up in the quoted price. Our crypto prediction markets page covers what that stack looks like in practice.

The rails also shape who trades where. Bank funding selects for US retail and institutions that need regulatory cover; USDC funding selects for a global, crypto-fluent user base. That difference in crowd composition is one reason the same event can price differently on each venue.

What markets can you trade on each platform?

Kalshi's historical strength is the scheduled-catalyst calendar: inflation prints, Fed decisions, jobless claims, weather outcomes, awards shows — recurring, data-settled events with clean resolution sources. Election markets joined the menu after the 2024 court ruling, and sports followed. The coverage skews US-centric, structured, and repeatable.

Polymarket's strength is breadth and speed. It lists global politics, geopolitics, crypto milestones, sports, and pop culture, and it is typically fast to spin up markets on breaking news. When a story breaks anywhere in the world, there is often a Polymarket contract on it within hours. The long tail is genuinely long — which is powerful for coverage and dangerous for liquidity, as we'll get to.

For a trader, the venues are complements more than substitutes: Kalshi for the macro calendar, Polymarket for the global news cycle. You can browse live coverage across both on the event dashboard, and our news desk tracks the catalysts that move them.

What do fees and spreads look like?

Kalshi charges explicit per-contract trading fees. The fee scales with contract price and is largest for contracts trading near the middle of the range, smaller near the extremes — so the cost of trading a coin-flip market is meaningfully higher than the cost of trading a near-certainty. The upside is transparency: the fee schedule is published, and you can compute your cost before you trade.

Polymarket has historically charged little to nothing in explicit trading fees on most markets. That does not make it free. Costs show up in the bid-ask spread, in funding friction on and off crypto rails, and occasionally in thin books where your own order moves the price. On both venues, the honest cost of a trade is fees plus spread plus slippage — and on both venues, spread and slippage vary enormously between a flagship market and a long-tail one. If you want the mechanics of how those prices translate to probabilities and expected value, see how prediction market odds work.

Can US traders use Kalshi and Polymarket?

Kalshi: yes. It is a US-regulated exchange built for US access, though the availability of specific contract types — sports in particular — has been contested by some state regulators, so the menu can vary with ongoing litigation.

Polymarket: historically no, formally. The 2022 CFTC settlement required it to restrict US persons, and for years US-based trading happened only outside the platform's terms of service, which is not a position we'd suggest building a strategy on. The QCEX acquisition in 2025 created a licensed vehicle for regulated US access, and the platform's US posture has been shifting since. As of this writing, the only reliable answer is: check Polymarket's current terms and your own jurisdiction. Regulatory status is platform risk, and platform risk belongs in your sizing.

Which platform has better liquidity?

Neither, categorically — they're deep in different places.

Polymarket's flagship markets, especially around major elections and global headline events, have historically been the deepest event markets anywhere: tight spreads, real size, continuous global flow. Its long tail is the opposite — plenty of markets where the book is thin, the spread is wide, and a modest order moves the price.

Kalshi's depth concentrates in its recurring economic markets and its highest-profile political and sports contracts, with a US-hours rhythm to the flow. Its long tail thins out too.

The practical rule: judge liquidity market by market, not platform by platform. Check the book before you size, and treat a wide spread as part of your cost. Liquidity also matters for accuracy — thin markets are noisier signals, a dynamic we unpack in are prediction markets accurate? When the same event trades on both venues, comparing the two books side by side on the event dashboard tells you where the real price discovery is happening.

How do settlement and disputes work?

This is the difference traders most often ignore until it costs them.

Kalshi: rulebook settlement under federal oversight

Every Kalshi contract specifies its settlement source and procedure in exchange rules filed under CFTC oversight. When the event resolves, the exchange settles per the rulebook, and disagreements run through a formal exchange process inside a federal regulatory framework. It's centralized, which is exactly the point: accountability has an address.

Polymarket: UMA's optimistic oracle

Polymarket resolves markets through UMA's optimistic oracle. In outline: a proposed outcome is posted with a bond, a challenge window follows, and if the proposal is disputed, the dispute escalates to a vote of UMA tokenholders. Most markets resolve without incident, but the mechanism has produced contested and controversial resolutions on ambiguously worded markets — and in a tokenholder vote, the deciding parties may hold positions. The lesson is the same on both platforms but sharper on Polymarket: read the resolution criteria before you trade, because you are trading the wording, not the headline.

So which prediction market should you use?

Kalshi is best for US-based traders who want bank funding and a federally regulated venue; traders focused on the macro calendar — CPI, Fed, economic data — where Kalshi's recurring markets are strongest; and anyone for whom regulatory clarity is a hard requirement rather than a preference.

Polymarket is best for globally focused traders who want the widest event coverage and fast listings on breaking news; crypto-native users for whom USDC rails are a convenience rather than a barrier; and anyone hunting size in flagship political and geopolitical markets — subject, always, to legal access in their jurisdiction.

The strongest answer for an active event trader is both, watched together. The venues have different crowds, different rails, and different rulebooks, which means they disagree — and cross-platform divergence on the same event is one of the most direct edge signals this asset class offers. For a wider tour of the venue landscape beyond these two, see our guide to the best prediction market platforms.

Nothing here is financial advice. Prediction market trading carries loss risk, liquidity risk, platform risk, and regulatory uncertainty; W.E.T. content is informational only.

Where to go next: open the event dashboard to compare live Kalshi and Polymarket odds side by side and watch for divergence on the events you care about, and join the W.E.T. community to compare notes with traders who are already working both books.