Polymarket vs Kalshi

Polymarket and Kalshi are the two largest prediction market platforms in 2026, and they take fundamentally different approaches to the same idea. Polymarket is crypto-native, decentralized in spirit, and globally focused. Kalshi is a CFTC-regulated traditional exchange, US-only, and built for users who want a familiar brokerage-like experience. Which one is better depends entirely on what you’re trying to do.

At a glance

How they differ technically

Polymarket is built on the Polygon blockchain. Trades, balances, and resolutions are recorded on-chain. The user-facing experience can feel like a normal website (you can sign up with email and Polymarket creates an embedded wallet for you), but underneath, you’re trading USDC-backed contracts on a decentralized exchange. As of April 2026, Polymarket transitioned to a new collateral token called pUSD, which is backed 1:1 by USDC and enforced on-chain.

Kalshi is built like a traditional exchange. You open an account, complete KYC, fund with USD via ACH or debit card, and trade event contracts that settle in dollars. There’s no blockchain layer. It feels and behaves like Robinhood or a discount brokerage.

For users who don’t want to deal with crypto wallets, Kalshi is dramatically simpler. For users comfortable with crypto, Polymarket offers more flexibility (instant deposits, no banking dependencies, true 24/7 access).

Market variety and depth

This is the area where Polymarket has the most decisive advantage. The international platform has thousands of active markets across every category imaginable — politics, sports, crypto, geopolitics, culture, weather, niche internet drama, you name it. Polymarket has historically been first to list markets on breaking news.

Kalshi’s market variety is more curated. The exchange must explicitly list each contract under CFTC oversight, which means new markets take longer to appear. Categories are well-covered but narrower. Sports markets in particular have been the focus of regulatory disputes, which has constrained Kalshi’s offerings in some periods.

Liquidity follows market variety. Polymarket international consistently has higher volume and tighter spreads, especially on major political and crypto markets. Kalshi has improved significantly in liquidity over the last year but still trails on most popular markets.

For the US-specific version of Polymarket, market variety is currently limited compared to the international platform, partly because liquidity is still building and partly because the regulated wrapper limits which markets can be offered. As of mid-2026, Kalshi often has equal or better liquidity than Polymarket US for the markets both platforms offer.

Fees: who actually charges less

Both platforms use a maker/taker fee model where limit orders pay zero (and may earn rebates) and market orders pay variable fees. The peak rates are roughly comparable, with Polymarket’s category-specific structure occasionally pricing some categories cheaper (geopolitics is currently fee-free) and others slightly higher (crypto peaks at $1.80 per 100 shares).

Practical differences:

Polymarket international wins on geopolitics markets (currently fee-free) and any category where you can use limit orders patiently.

Kalshi wins on simplicity — the fee structure is uniform and predictable, with fewer category-specific edge cases to remember.

Polymarket loses on funding cost if you use a debit card on-ramp. The 2-4% you pay to Coinbase or MoonPay can dwarf the per-trade savings. Direct USDC transfers avoid this, but most casual users don’t bother.

Kalshi loses on settlement speed. Bank transfers can take days; instant funding via debit card has fees. Polymarket’s crypto rails are nearly instant once you have USDC.

For a deeper breakdown, see our Polymarket fees guide.

Availability and KYC

This is where Kalshi has the clearest advantage for US users. Kalshi is fully public and available to all US residents in all 50 states, with the standard KYC of a US brokerage account. Polymarket US is still invite-only as of mid-2026 and not available in nine states (AZ, IL, MA, MD, MI, MT, NJ, NV, OH). See our complete US legal status guide for details.

For non-US users, the situation reverses. Kalshi is US-only. Polymarket international serves users in 160+ countries with restrictions only in sanctioned jurisdictions.

The KYC experience also differs:

• Kalshi: Full KYC required upfront for all users. Photo ID, SSN, address verification.
• Polymarket international: Can be used with minimal verification for small activity. Larger withdrawals trigger KYC review.
• Polymarket US: Full KYC including government ID, SSN, proof of residency, and a live selfie. CFTC requirement.

For users who prioritize privacy, Polymarket international is the clear winner — though “privacy” on a public blockchain is partial at best, and US-based users have no legal way to access it.

Settlement and resolution

Both platforms settle markets based on real-world outcomes, but the resolution mechanisms differ:

Kalshi resolves markets based on its own determination, with disputes handled through traditional financial channels. Resolution sources are clearly stated in each contract before listing.

Polymarket uses a decentralized oracle system (UMA’s Optimistic Oracle) for resolution. A proposed answer is posted, and there’s a window during which any user can dispute the resolution by staking tokens. Disputes are rare but have happened on edge-case markets with ambiguous wording.

In practice, both platforms resolve straightforward markets quickly and accurately. Kalshi’s process is slightly more centralized but also more predictable; Polymarket’s is more transparent but occasionally produces drama on disputed edge cases.

Who’s better at what

For US political markets: Both are competitive. Kalshi has historically been strong here, while Polymarket has had higher volume on major elections.

For sports betting: This is contested terrain. Kalshi was first to list NFL contracts, but state-level legal challenges have created gaps in coverage. Polymarket US has been adding sports contracts but is also subject to the same state battles. For non-US users, Polymarket international has the broadest sports coverage.

For crypto markets: Polymarket dominates. Kalshi has limited crypto offerings, while Polymarket has deep markets on token prices, ETF flows, and on-chain events.

For fast-moving news: Polymarket lists markets faster. Kalshi’s CFTC oversight slows market creation.

For institutional users: Kalshi’s regulated structure is more compatible with institutional compliance requirements. Polymarket international is harder to access institutionally without specific regulatory carve-outs.

Sign-up bonuses

Both platforms run referral programs with sign-up incentives. As of mid-2026:

• Polymarket offers $20 in trading credit for new users with a valid promo code. See our Polymarket promo code page for the current verified codes.
• Kalshi runs varying promotions throughout the year, including deposit matches and trading credit bonuses. Amounts and terms change frequently.

If you’re trying both platforms (which is what we’d recommend if you’re researching), claim both bonuses.

Common questions

Can I use both platforms?

Yes. Many active users have accounts on both. The platforms don’t compete in any way that would prevent dual usage, and using both lets you compare prices on markets that exist on both — sometimes the same outcome trades at meaningfully different prices.

Which is more accurate?

Both have produced accurate forecasts that have outperformed polls in major election cycles. Polymarket’s higher liquidity often translates to tighter prices on major markets, but Kalshi’s prices are typically close. For most political and economic markets, the two trade within a percentage point or two of each other.

Which has better customer support?

Kalshi’s support is more traditional and faster — closer to what you’d expect from a US brokerage. Polymarket’s support is improving but historically has been spottier, especially for the international platform where dispute resolution can take longer.

What if one platform delists my market?

If a market is delisted before resolution (rare but possible), the platform’s specific terms govern what happens. Both platforms typically refund open positions in such cases, though the exact mechanism differs.

Can I trade the same market on both platforms?

For some major events, yes — both platforms list comparable markets, and you can trade either or both. The contracts are technically distinct (different platforms, different terms), so positions don’t offset between platforms.

Verdict

If you’re a US user looking for the simplest, most regulated experience: Kalshi.

If you’re outside the US, or in an eligible US state and want the deepest market variety with the cheapest fees: Polymarket (international or US, depending on your location).

For most people doing serious prediction-market participation, the answer is “both, used for what each does best.”

Ready to try Polymarket? Use our verified promo codes for $20 free on signup, or read our full how-to-use guide first.

Last updated: May 2026. Both platforms evolve quickly, so verify current details on official sites before opening accounts.