Kalshi vs Polymarket: Full Comparison

Kalshi and Polymarket are the two most significant prediction market platforms operating today, and they represent fundamentally different approaches to the same product. Kalshi is the fully CFTC-regulated US exchange built on traditional financial infrastructure. Polymarket is the crypto-native platform with the deepest global liquidity and the lowest fees in the industry. We scored both across 9 categories using our published methodology with real-money testing. This is the full breakdown.

Last updated: March 2026

Disclosure: PredictionScout may earn commissions from platforms linked on this page. Rankings and scores reflect our methodology, not commission rates. Platforms cannot pay for higher placement. See our affiliate disclosure.

Quick Comparison

Both platforms are legitimate and serve different user profiles well. The right choice depends on where you live, how you want to fund your account, and whether fees or regulatory protection matters more to you.

How We Scored Each Platform

We evaluate every prediction market platform across 9 weighted categories: regulatory safety (20%), market selection (15%), fees (15%), liquidity (15%), user experience (10%), withdrawals (10%), deposits (5%), tax reporting (5%), and customer support (5%). Each category has defined rubrics with specific thresholds for each score tier.

Scores are based on public fee schedules, regulatory filings, real-money testing, user review analysis, and community research. The full framework is published on our methodology page so you can see exactly how we arrive at each number.

Where Kalshi Wins

Regulation and Fund Safety (Kalshi 9.0 vs. Polymarket 5.5)

This is the widest gap between the two platforms and the most consequential one. Kalshi holds both a CFTC Designated Contract Market license and a Derivatives Clearing Organization registration. That dual status means your funds are legally segregated from Kalshi’s operating capital under federal law. If Kalshi went bankrupt tomorrow, customer funds are protected by the same regulatory framework that governs futures exchanges.

Polymarket’s global platform has no equivalent protection. Funds sit in smart contracts on the Polygon blockchain — secured by code, not by a federal regulator. The December 2025 security breach, where a third-party authentication vulnerability allowed unauthorized account access, underscored the risk. Polymarket never disclosed how many users were affected or how much was lost.

Polymarket’s US platform (Polymarket Exchange) does operate under CFTC rules following the QCEX acquisition in July 2025 for $112 million. But that platform is still in waitlist rollout. For most users today, the regulatory gap is real.

Bottom line: If fund safety is your top priority, Kalshi is the clear choice. This single category is the primary reason Kalshi outscores Polymarket overall — it carries 20% of the total weight.

Deposits and Funding Options (Kalshi 8.0 vs. Polymarket 4.5)

Kalshi accepts bank transfers (free), debit cards (2% fee), Apple Pay, Google Pay, wire transfers, and cryptocurrency via Zero Hash. Minimum deposit is $10. If you have a US bank account, you can fund a Kalshi account in minutes.

Polymarket requires USDC on the Polygon network. Period. No bank transfer. No debit card. No PayPal. If you don’t already hold USDC or know how to bridge assets to Polygon, you need to buy crypto on an exchange, convert to USDC, transfer it to a Polygon-compatible wallet, and then deposit to Polymarket. That’s 3-4 steps before you can place your first trade.

For crypto-native users, this is a non-issue. For the majority of US retail traders, it’s a significant barrier.

Tax Reporting (Kalshi 5.0 vs. Polymarket 3.0)

Neither platform handles taxes well, but Kalshi is further along. Kalshi issues 1099-MISC forms for net winnings over $600, 1099-INT for interest earned on idle balances, and 1099-B for crypto-related transactions. The forms aren’t perfect — the IRS hasn’t issued definitive guidance on how prediction market gains should be classified — but at least you get documentation.

Polymarket issues nothing. No 1099. No transaction export for tax purposes. If you trade on Polymarket, you’re responsible for tracking every trade and computing your own gains and losses. For active traders with hundreds of positions, that’s a real burden. See our tax guide for what you need to know.

User Experience (Kalshi 8.0 vs. Polymarket 6.5)

Kalshi has native iOS and Android apps with strong ratings — 4.7 stars from 22,000+ iOS reviews and 4.5 stars from 3,100+ Android reviews. The web platform mirrors the mobile experience with full functionality. Contract framing is plain-language: “Will the Fed cut rates before July?” with a Yes/No binary and a clear price.

Polymarket’s web interface is functional but more complex. There’s no native mobile app — you use the mobile web version or interact through MetaMask. The order book is visible and powerful for experienced traders, but the learning curve is steeper. If you’ve used DeFi protocols, Polymarket feels natural. If you haven’t, the wallet connection and transaction signing workflow adds friction that Kalshi doesn’t have.

Where Polymarket Wins

Fees (Polymarket 9.0 vs. Kalshi 7.0)

This is Polymarket’s most decisive advantage. On a $100 trade at 50/50 odds:

Polymarket charges a 0.10% taker fee on the US platform and zero maker fees. The global platform charges near-zero fees on most markets. Kalshi’s taker fee formula (0.07 x C x P x (1-P)) produces roughly 1.75% at mid-range probabilities, and the maker fee formula adds cost if you’re providing liquidity.

If you make 50 trades per month at $100 each, you’d pay roughly $5 in fees on Polymarket versus $87.50 on Kalshi. Over a year, that’s $60 versus $1,050. The math is unambiguous.

Liquidity and Execution (Polymarket 8.0 vs. Kalshi 7.0)

Polymarket processes $8 billion in 30-day volume as of March 2026. That volume translates to tighter spreads — 2-5 cents on active markets versus 3-8 cents on comparable Kalshi markets. On a high-volume political or crypto market, Polymarket typically fills orders faster and at better prices.

The difference is most visible on markets that both platforms list. On a contract like “Will the Fed cut rates in June?”, Polymarket might show a 48/52 spread while Kalshi shows a 46/54 spread. That 2-4 cent spread difference costs you money on entry and exit. If you’re trading actively, tighter spreads compound into meaningful savings alongside the lower fees.

Kalshi’s liquidity has been improving — its user base is growing and the order books are deeper than they were a year ago. But on volume alone, Polymarket operates at a different scale.

Withdrawals (Polymarket 6.5 vs. Kalshi 5.0)

Polymarket withdrawals settle in minutes. You send USDC from your Polymarket proxy wallet to any Polygon-compatible address, and it arrives in one blockchain confirmation. If you want to convert to USD, you transfer to an exchange, sell, and withdraw — which adds time, but the initial step is near-instant.

Kalshi withdrawals are a known pain point. ACH to the same bank you deposited from takes 7 business days. Withdrawing to a different bank than your deposit source can take up to 90 days — an anti-fraud policy that catches new users off guard. Multiple user complaints on BBB and Trustpilot cite withdrawal delays as a primary frustration.

If you need quick access to your funds, Polymarket’s crypto-native withdrawal is dramatically faster — assuming you’re comfortable with the USDC-to-fiat conversion process.

Market Breadth and Global Scale (Polymarket 8.5 vs. Kalshi 9.0)

Kalshi scores higher on market selection in our methodology because it offers the widest regulated variety for US traders — 10+ categories including politics, sports, economics, culture, crypto, technology, climate, and health. But Polymarket wins on sheer scale: 33,000+ listed markets globally, covering geopolitics, AI, science, and niche topics that Kalshi doesn’t touch.

If you want to trade on whether a specific AI model will pass a benchmark, or whether a particular country will hold elections by a certain date, or hyper-specific crypto scenarios — Polymarket almost certainly has a market. Kalshi’s market creation is more conservative, which means higher quality curation but narrower coverage on the long tail.

Full 9-Category Score Comparison

Kalshi leads in 6 of 9 categories. Polymarket leads in 3 — but those 3 (fees, liquidity, withdrawals) are the categories that matter most to active, high-volume traders. Kalshi’s overall lead comes primarily from the regulatory safety category, which carries the highest weight at 20%. If you reweighted fees and liquidity higher and regulation lower, Polymarket would close or erase the gap.

That’s why we publish our weights — your priorities may differ from ours. See the methodology page for the full rubric.

Which Platform Is Right for You?

The best platform depends on who you are. Here’s a decision framework:

Choose Kalshi if you:

• Are a US resident who wants to trade today. Kalshi is available in all 50 states. Polymarket’s US platform is waitlist-only.
• Prioritize fund safety. CFTC-mandated fund segregation means your money is protected if the company fails. No crypto platform offers equivalent protection.
• Want to fund from a bank account. Free bank transfers, $10 minimum. No crypto knowledge required.
• Need tax documentation. Kalshi issues 1099-MISC, 1099-INT, and 1099-B forms. Polymarket issues nothing.
• Prefer a polished mobile app. Kalshi’s iOS app has 4.7 stars from 22,000+ reviews. Polymarket has no native app.
• Trade across many categories. Politics, sports, economics, culture, crypto, climate, health — all on one regulated platform.

Choose Polymarket if you:

• Are crypto-native. If you already hold USDC and use Polygon, Polymarket’s infrastructure is built for you. Deposits and withdrawals are near-instant.
• Are fee-sensitive. At 0.10% taker fees (US) or near-zero (global), Polymarket is 10-17x cheaper than Kalshi on equivalent trades.
• Trade in high volume. Deeper liquidity, tighter spreads, and lower fees compound into meaningful savings for active traders.
• Are a non-US resident. Kalshi is US-only. Polymarket’s global platform is accessible from most countries.
• Want access to niche or global markets. 33,000+ listed markets including geopolitics, AI, science, and hyper-specific scenarios that Kalshi doesn’t list.
• Value fast withdrawals. USDC to your wallet in minutes versus 7-90 days on Kalshi.

Consider both if you:

• Want the best price on every trade. When both platforms list the same market, you can compare prices and take the better spread.
• Want regulated access plus global liquidity. Use Kalshi for regulated markets where fund safety matters, and Polymarket for high-liquidity markets where execution quality matters.
• Are building conviction in the prediction market space. Keeping accounts on multiple platforms lets you evaluate each one with real money before committing to a primary.

Can You Use Both?

Yes — and many serious traders do. There’s no exclusivity agreement on either platform. You can maintain active accounts on both and route trades based on which offers better pricing, deeper liquidity, or more relevant markets for a given event.

A common approach: use Kalshi as your primary US-regulated account for broad market access and tax documentation, and use Polymarket for high-volume markets where the fee and liquidity advantages make a material difference. The platforms complement each other more than they compete — Kalshi’s strengths (regulation, deposits, UX) are Polymarket’s weaknesses, and vice versa.

The only friction is managing two separate accounts with different funding mechanisms. Kalshi uses traditional bank rails. Polymarket uses crypto. If you’re comfortable moving between both, having two platforms gives you more options than either one alone.

For a broader view of all available platforms, see our Best Prediction Market Platforms 2026 rankings.

Common Questions

Should I use Kalshi or Polymarket?

It depends on your situation. Kalshi is the better choice for most US residents right now: it’s available in all 50 states, accepts bank deposits, issues tax forms, and has full CFTC regulatory protection with mandated fund segregation. Polymarket is the better choice if you’re crypto-native, a non-US resident, or a high-volume trader who prioritizes the lowest possible fees and deepest liquidity. Polymarket’s US platform is still in waitlist rollout as of March 2026, so most US residents can’t access it yet.

Which platform has lower fees?

Polymarket, by a wide margin. The US platform charges a 0.10% taker fee with zero maker fees. Kalshi’s taker fee formula works out to roughly 1.75% on a 50-cent contract. On a $100 trade at even odds, you’d pay about $0.10 on Polymarket versus $1.75 on Kalshi. Over dozens of trades, that difference compounds. The trade-off is that Polymarket requires cryptocurrency (USDC on Polygon) to fund, while Kalshi accepts bank transfers for free.

Can US residents use Polymarket?

Polymarket’s US platform (Polymarket Exchange) received CFTC approval via its QCEX acquisition in July 2025, but as of March 2026 it is still in waitlist rollout. Most US residents cannot sign up and trade today. The global Polymarket platform is not available to US residents under its terms of service. Kalshi is the primary CFTC-regulated prediction market that US residents can access immediately in all 50 states.

Which platform is safer?

Kalshi scores 9.0 out of 10 on regulatory safety; Polymarket scores 5.5. Kalshi is a CFTC Designated Contract Market and Derivatives Clearing Organization with federally mandated fund segregation — your money is legally separated from company funds. Polymarket’s global platform holds funds in smart contracts without a federal regulatory backstop. Polymarket also experienced a security breach in December 2025 through a third-party authentication vulnerability. Neither platform has FDIC insurance. For more on what “safe” means in this context, see our individual reviews: Kalshi, Polymarket.

Can I use both Kalshi and Polymarket?

Yes — there’s no exclusivity. Many active traders maintain accounts on both platforms and route trades based on which offers better pricing or liquidity for a specific market. Kalshi is stronger for regulated US access and market breadth. Polymarket is stronger for fee-sensitive trading and deep liquidity on high-volume markets. Using both lets you compare prices and take the better deal on each trade.

Which has better liquidity?

Polymarket has significantly deeper liquidity overall, with $8 billion in 30-day volume as of March 2026 and spreads of 2-5 cents on active markets. Kalshi’s spreads on comparable markets typically run 3-8 cents. The difference is most pronounced in politics and crypto markets. Kalshi’s liquidity is improving as its user base grows, but on raw volume and spread tightness, Polymarket operates at a different scale. For more detail on how we measure liquidity, see our methodology.

New to prediction markets? Start with What Are Prediction Markets? for a plain-English introduction, or jump to Your First Prediction Market Trade for a step-by-step walkthrough. For the legal landscape, see Are Prediction Markets Legal?