Polymarket vs Kalshi: Which Prediction Market Should You Use?
Both platforms are now CFTC-regulated and operating in the U.S., but they offer very different experiences in 2026. A side-by-side look at access, market breadth, and which trader each one is built for.
Short answer: Both are now CFTC-regulated and legal for U.S. residents. Kalshi is operationally open today, with the broader market menu, sports, elections, economics, weather, and more. Polymarket US, the regulated American app launched after Polymarket’s 2025 acquisition of the QCEX exchange, is in invite-only beta with a sports-first market menu and a long waitlist. For most U.S. traders in 2026 the practical answer is Kalshi; for sports traders willing to wait for an invite, Polymarket US offers a sportsbook-style presentation that may feel more familiar. Polymarket’s original international platform still exists but remains geo-blocked to U.S. residents.
At a glance
| Polymarket US | Kalshi | |
| Regulation | CFTC-regulated DCM (QCX LLC d/b/a Polymarket US, via 2025 QCEX acquisition). | CFTC-regulated DCM. Operating since 2021. |
| U.S. access | Invite-only beta. Waitlist of over one million users as of mid-2026. | Open in most states (subject to state-level challenges; voluntarily limited in Nevada). KYC required. |
| Currency | USD. Funding via traditional rails. | USD. ACH, debit card, wire. |
| Markets | Sports first (NBA, MLB, NHL, EPL daily; NFL/college futures). Politics, crypto, and current events expected to follow. | Sports, elections, economics, weather, climate, entertainment, awards. |
| Resolution | Standard CFTC DCM framework with pre-specified rules per contract. | Designated panel resolves against named official sources (NOAA, BLS, AP, etc.). |
| Interface | Native iOS and Android apps with Face ID, push notifications, Spotlight search. Contracts default to American odds. | Web + native iOS and Android apps with Face ID, push notifications, lock-screen alerts. Contracts presented in cents (price-of-yes). |
| State-level legal exposure | The regulated U.S. product has not been the direct target of state actions. Polymarket's international platform was hit by a Nevada TRO in January 2026 (against operator Blockratize). | Multiple state actions in March 2026: Arizona criminal charges, Nevada TRO and preliminary injunction, Washington civil suit, and other state-level proceedings. Federal CFTC approval intact. |
| International access | Original Polymarket platform still operates offshore on Polygon (with USDC / pmUSD) for non-U.S. users. | U.S.-only product. |
Where Polymarket US wins
Sportsbook-style presentation.
Polymarket US defaults to American odds (–110, +150, etc.) with one-tap switches to percent and price views. For traders coming from DraftKings, FanDuel, or a traditional sportsbook, the on-ramp is immediate. Kalshi presents the same contracts in cents (the price of a yes share), which is the more transparent representation for event-contract math but a higher-friction translation for sportsbook natives.
Brand recognition and liquidity pedigree.
Polymarket carries the brand equity from the 2024 election cycle, when its international platform handled the largest event-contract volumes in the industry’s history. The U.S. product inherits that recognition, and the market-making infrastructure that supports tighter spreads once invite volume scales.
Read more: How Polymarket works →
Where Kalshi wins
Operational availability today.
Kalshi is open in most states. You can sign up, fund an account, and trade in a single session without joining a waitlist (see the section below on state-level challenges; Kalshi has voluntarily limited some Nevada offerings in response to a court order). As of mid-2026 the Polymarket US waitlist exceeds one million users, and the company has not announced a timeline for full public launch. If you want to participate in the current cycle of prediction markets, federal elections, the in-progress sports calendar, macro releases, Kalshi is the broader full-access option.
Market breadth.
Kalshi’s menu spans sports, elections (federal and state), economic-data releases, weather, climate, entertainment, and awards. Polymarket US launched with sports only and is rolling out new categories incrementally; politics and crypto are expected but not yet available on the regulated U.S. product. For traders who want to express views across categories, Kalshi has the deeper bench today.
Resolution rigor.
Kalshi names the official source for each contract’s resolution in the rulebook before trading opens. A weather contract resolves on NOAA’s published data; an economic-data contract resolves on the BLS release; an election contract resolves on certified state results. Disputes are rare because the source is locked in upfront, a workflow that translates well across very different categories.
What about state-level legal challenges?
Federal approval is settled, the CFTC dropped its election-markets appeal in May 2025, and both Kalshi and Polymarket US operate as licensed Designated Contract Markets. The active tension is at the state level, where multiple state regulators have argued that prediction-market sports and election contracts amount to gambling requiring state licensure.
States that have taken enforcement action against prediction-market sports or event contracts, including cease-and-desist orders, civil suits, and (in Arizona) criminal charges, include Arizona, Connecticut, Illinois, Maryland, Massachusetts, Michigan, Montana, Nevada, New Jersey, New York, Ohio, Tennessee, and Washington. Kalshi has been the primary target; Polymarket has been named alongside Kalshi in the Tennessee cease-and-desist and the Nevada matters. The platforms are contesting these actions on federal-preemption grounds and have voluntarily limited some state-specific offerings (Kalshi in Nevada, both platforms in Tennessee at various points) while litigation proceeds. The picture changes week to week as injunctions are granted, stayed, or appealed, check each platform’s current geographic availability before signing up.
Which one to choose
The decision in 2026 is mostly about access, breadth, and which trading style you prefer:
- Want to trade today, across categories: Kalshi. Open access, full menu, federal approval intact.
- Sports-first, sportsbook UX, willing to wait: Polymarket US. American-odds presentation, an exclusive partnership with MLB, and a sports-focused market menu once you’re off the waitlist.
- Outside the U.S.: The original Polymarket international platform is still the largest event-contract venue by volume, settling in USDC on Polygon.
- Want both: Many active U.S. traders use Kalshi today and have joined the Polymarket US waitlist for sports markets, picking the venue per contract once invites land.
How Over / Under fits in
Over / Under aggregates live contracts from Kalshi and Polymarket into a single feed with AI-generated analysis on each. Instead of jumping between two exchanges to compare prices on the same underlying event, you can see both sides on one screen with an honest read on whether the line is sharp or mispriced.
Browse contracts →How our analysis works →
Frequently asked
Is Polymarket legal in the United States?
Yes, the regulated U.S. version is. Polymarket acquired QCEX, an already-licensed CFTC Designated Contract Market and clearinghouse, in 2025, and the regulated U.S. product now operates as QCX LLC d/b/a Polymarket US. As of mid-2026 the app is in invite-only beta with a multi-million-user waitlist. The original international Polymarket platform continues to operate offshore on Polygon and remains geo-blocked from U.S. residents.
Is Kalshi regulated?
Yes. Kalshi is a CFTC-regulated Designated Contract Market, the first event-contract exchange of its kind to operate legally in the United States. Federal approval covers sports, elections, economics, weather, and other categories; several states have challenged the sports contracts at the state level, but the federal license is intact.
How are contracts resolved?
Kalshi resolves through a designated panel that references the official source named in each contract’s rulebook before trading opens. Polymarket US, as a CFTC-regulated DCM, follows the standard regulated-exchange resolution framework with pre-specified rules per contract. Polymarket’s international platform still uses UMA’s optimistic oracle for on-chain dispute resolution.
Which platform has lower fees?
Both U.S. platforms charge minimal trading fees relative to traditional sportsbooks, and both fund via standard banking rails (no gas, no crypto-to-USD friction). Explicit per-trade fees are comparable; the larger cost difference for active traders is implicit, in the form of spread and depth on the specific contracts each one carries.
Do I need an invite for Polymarket US?
Yes. As of mid-2026 the Polymarket US app is invite-only, with a waitlist of over one million users. Invite codes go out on a rolling basis, and the company has not announced a timeline for full public launch. Joining the waitlist is free and doesn’t require KYC until you receive an invite.