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Polymarket vs Kalshi: Which Prediction Market Platform Is Better in 2026?

Updated April 1, 2026 · 18 min read · By the PredScope Research Team

Platform Overview

Regulation & Legal Status

This is the single biggest difference between the two platforms and often the deciding factor for most traders.

Kalshi: CFTC-Regulated

Kalshi is a designated contract market (DCM) regulated by the U.S. Commodity Futures Trading Commission (CFTC). It was the first event-contract exchange to receive this designation in 2020. In late 2024, Kalshi won a landmark federal court case against the CFTC, gaining the right to list congressional and presidential election contracts.

For US-based traders, Kalshi offers legal certainty. Your funds are held in regulated accounts, and the platform must comply with strict oversight requirements.

Polymarket: Offshore & Unregistered

Polymarket operates offshore without US regulatory registration. In 2022, it settled with the CFTC for $1.4M for operating an unregistered trading facility. US users are officially geo-blocked, though enforcement of this restriction has been questionable.

In November 2024, the FBI raided CEO Shayne Coplan’s home as part of a DOJ investigation, adding further legal uncertainty for the platform.

Bottom line: If you’re a US resident, Kalshi is the safe choice. If you’re outside the US, Polymarket offers more markets and liquidity.

Fees Comparison

Polymarket

• No explicit trading fees on the platform
• Revenue comes from market-maker spreads
• Minimal gas fees on Polygon (fractions of a cent)
• Effectively zero-fee trading for users

Kalshi

• Per-contract fees on both entry and exit
• Typically 1-3 cents per contract per side
• Occasionally runs zero-fee promotions
• Fee schedule changes frequently — check their site for current rates

Winner: Polymarket — Zero fees vs. per-contract charges is a clear advantage for active traders.

Market Coverage

Polymarket consistently offers more markets across more categories. As a less-regulated platform, it can list markets on trending topics within hours. Categories include politics, crypto prices, AI milestones, geopolitics, culture, and more.

Kalshi focuses on regulated event categories: economic data (Fed rates, CPI, GDP), weather events, elections (after their 2024 court victory), and entertainment awards. The CFTC restricts Kalshi from listing sports betting markets.

At any given time, Polymarket has 500-1,000+ active markets compared to Kalshi’s 100-300. However, Kalshi’s markets tend to be higher quality with clearer resolution criteria.

Liquidity & Volume

Polymarket is the clear leader in cumulative volume. Polymarket has now processed over $10 billion in cumulative trading volume. Kalshi has reached $1B+ in cumulative volume and reported $8.5 billion in 30-day volume by early 2026, reflecting its rapid growth as a CFTC-regulated exchange.

Higher volume means tighter spreads and better prices for traders. For popular markets (elections, major crypto events), Polymarket typically offers better liquidity.

User Experience

Who Should Use Which Platform?

Choose Polymarket if:

• You’re outside the United States
• You want maximum market variety and access to trending topics
• You’re comfortable with crypto (USDC) deposits
• You want zero trading fees
• You trade frequently and need the best liquidity

Choose Kalshi if:

• You’re a US resident who wants legal certainty
• You prefer fiat (USD) deposits and withdrawals
• You value regulatory protection for your funds
• You want a native mobile app experience
• You primarily trade economic events (Fed rates, CPI, GDP)

Can You Use Both?

Yes, and many active prediction market traders do. Using both platforms gives you access to the widest range of markets and lets you compare odds across platforms to find the best prices. Our live comparison tool tracks price differences between platforms in real time.

2026 Platform Updates: What’s Changed

Polymarket in 2026: IPO, Valuation, and Legal Cloud

Polymarket has emerged from 2025 as the undisputed global leader in prediction markets by volume and brand recognition. The company’s massive visibility during the 2024 US presidential election — where it was cited by media worldwide as a real-time barometer of electoral outcomes — drove a wave of new institutional and retail traders to the platform.

In early 2026, reports surfaced of Polymarket exploring a formal IPO or SPAC merger at a valuation in the range of $5–7 billion, with $6 billion cited most frequently by sources familiar with the discussions. The fundraising chatter reflects how dramatically the prediction markets sector has expanded, but it also highlights an irony: a company that remains legally inaccessible to US residents is pursuing a public listing in US capital markets.

The DOJ investigation that followed the November 2024 FBI raid of CEO Shayne Coplan’s home remained unresolved as of Q1 2026. No charges have been filed publicly, but the cloud of legal uncertainty continues to hang over Polymarket’s US market ambitions. Several sources indicate Polymarket is actively lobbying for a regulatory framework that would allow it to re-enter the US market legally — whether through a CFTC license application or a partnership with a licensed entity.

On the product side, Polymarket launched an improved market-creation interface in late 2025, dramatically cutting the time from news event to live market. The platform also expanded its API, making it easier for algorithmic traders and data consumers (including PredScope) to access live odds programmatically.

Kalshi in 2026: Expansion, Volumes, and Robinhood Partnership

Kalshi has arguably had the more transformative 2025–2026 arc. Following its 2024 court victory over the CFTC on election markets, Kalshi rapidly expanded its product catalog and aggressively pursued volume growth. The company reported $8.5 billion in 30-day trading volume by early 2026 — a figure that would have seemed impossible just two years earlier for a niche event-contracts exchange.

The single biggest catalyst for Kalshi’s growth was the announcement of a distribution partnership with Robinhood. Robinhood, which has over 23 million funded accounts and a user base that skews younger and more risk-tolerant, integrated Kalshi’s event contracts into its main trading app. This instantly gave Kalshi access to a massive retail audience who would never have found the platform organically. See our dedicated Robinhood Prediction Markets guide for full details on what this integration covers and its limitations.

Kalshi also expanded internationally in 2026, beginning limited access for traders in Canada, the UK, and select EU countries under local regulatory frameworks — a move that directly challenges Polymarket’s international dominance.

Fee changes: Kalshi revised its fee structure in Q1 2026, introducing tiered maker/taker rebates for high-volume traders. Professional traders who provide liquidity (maker orders) now receive rebates, while takers pay slightly higher fees. This structure mirrors traditional futures exchanges and is designed to attract market-making firms.

Robinhood Enters Prediction Markets Directly

Beyond its Kalshi partnership, Robinhood has also been developing its own proprietary prediction markets product. In Q4 2025, Robinhood launched a beta of event contracts natively within the Robinhood platform for accredited investors. As of April 2026, this remains a limited beta, but it signals that Robinhood intends to compete directly in the space — not just distribute Kalshi’s products.

For traders evaluating Polymarket vs Kalshi, Robinhood’s entry is worth tracking. It could eventually become a third major platform, particularly for US retail traders who prefer an all-in-one brokerage experience. Read our Polymarket vs Robinhood comparison for a deeper analysis.

Detailed Fee Structure Analysis

Understanding the true cost of trading on each platform requires looking beyond headline fees. Here’s a comprehensive breakdown of every fee category for both platforms as of April 2026.

Polymarket Fee Structure (Detailed)

The key insight on Polymarket fees: the platform itself charges nothing, but the full round-trip cost (fiat → USDC → trade → USDC → fiat) can add up to 3–5% for users who aren’t already crypto-native. Traders who hold USDC or other stablecoins already effectively pay zero in deposit/withdrawal fees.

For a complete breakdown of every cost involved, see our dedicated Polymarket Fees guide.

Kalshi Fee Structure (Detailed)

Kalshi’s fee model most resembles a traditional futures broker: no deposit or withdrawal fees, but a per-trade fee that is most visible when you actively buy and sell. The trading fee structure means Kalshi becomes relatively more expensive the more actively you trade — the opposite of a typical brokerage where commissions compress at higher volumes.

Fee example comparison: A trader who buys 100 contracts at $0.50 each ($50 total) and later sells them at $0.75 each ($75 total):

• On Polymarket: $0 in platform fees. Spread cost might be $0.50–$1.50 depending on liquidity. Net profit: ~$24.00–$25.00.
• On Kalshi: ~$1–3 in trading fees at entry + ~$1–3 at exit. Net profit: ~$19–23 depending on exact fee rate.

For high-frequency traders making dozens of trades per day, this fee difference compounds significantly in Polymarket’s favor.

Registration & KYC: Getting Started on Each Platform

Signing Up on Polymarket

Polymarket’s onboarding is intentionally lightweight and crypto-native. Here’s the typical flow for a new user outside the US:

1. Visit polymarket.com (US IPs will see a geo-restriction message)
2. Connect a crypto wallet — MetaMask, Coinbase Wallet, or any WalletConnect-compatible wallet works. Alternatively, use "sign in with email" which creates a custodial wallet automatically.
3. Deposit USDC on Polygon — Either bridge from Ethereum mainnet (slow and expensive) or buy USDC directly on Polygon via the Polymarket on-ramp.
4. Start trading immediately — No identity verification required for accounts under certain thresholds.

KYC is triggered only for large withdrawals or in jurisdictions with specific requirements. Many casual traders never complete formal identity verification. This is a deliberate design choice that maximizes accessibility but reduces regulatory protections for users.

For detailed instructions, see our How to Deposit on Polymarket guide.

Signing Up on Kalshi

Kalshi’s registration process is more thorough, reflecting its regulated status:

1. Create account with email and password at kalshi.com
2. Verify email address via confirmation link
3. Complete identity verification (KYC) — upload government ID (driver’s license or passport) plus a selfie. This is mandatory for all users, not optional.
4. KYC review — typically instant for clear documents; can take up to 24 hours in edge cases
5. Deposit USD — link bank account via ACH or enter debit card details
6. Funds available — debit card funds are typically instant; ACH takes 1–3 business days but may be immediately tradable up to a limit

Kalshi is available only to US residents (and select international markets added in 2026). You must be at least 18 years old and provide a valid US Social Security Number for tax reporting purposes.

See our full How to Use Kalshi guide for a complete walkthrough with screenshots.

Registration Speed Comparison

Market Coverage: A Category-by-Category Breakdown

Choosing a platform often comes down to which markets you care about most. Here’s a detailed breakdown of how Polymarket and Kalshi compare across major prediction market categories.

Overall market coverage winner: Polymarket — by a significant margin. Polymarket wins in 7 of 10 categories above. Kalshi’s strength is depth in economic data markets, where its structured, CFTC-approved contracts provide more granular resolution criteria than Polymarket’s equivalent markets.

Liquidity & Volume: A Deeper Look

Liquidity deserves nuanced treatment. Raw volume numbers favor Polymarket significantly on a cumulative basis, but Kalshi’s 30-day volumes in early 2026 indicate it has dramatically closed the gap. The Robinhood integration in particular channeled significant retail order flow to Kalshi, pushing single-day volumes to levels not seen previously for the platform.

Liquidity by Market Type

Where you trade matters as much as which platform you use. Here’s a practical guide to liquidity conditions you can expect:

• Major US Elections on Polymarket: Extremely liquid. Presidential markets in 2024 saw hundreds of millions in volume. Bid-ask spreads under 1 cent are common on popular binary outcomes.
• Economic Data on Kalshi: Very liquid for big releases (Fed rate decisions, CPI). Kalshi’s structured contract format means market-makers provide tight quotes, especially around release dates.
• Niche markets on either platform: Can be illiquid with 5–10% spreads. Always check the order book depth before placing large orders.
• Crypto markets on Polymarket: Generally liquid for Bitcoin and Ethereum; altcoin markets can be thin.

Arbitrage Opportunities Between Platforms

When both platforms list the same market (e.g., “Fed raises rates at next meeting?”), price differences occasionally emerge. These create risk-free profit opportunities for traders who monitor both platforms simultaneously. Our Prediction Market Arbitrage guide explains how to find and execute these trades. PredScope’s comparison tool surfaces these differences in real time.

Security & Fund Safety

Polymarket: Crypto-Native Security

Polymarket’s security model is fundamentally different from traditional finance. Your trading positions are represented as ERC-1155 tokens on the Polygon blockchain, meaning they exist on-chain and are not custodied by Polymarket itself.

What this means in practice:

• Platform hack risk is reduced for on-chain positions — Polymarket can’t "lose" your shares the way a bank could lose deposits
• Smart contract risk is real — bugs in Polymarket’s contracts have occurred historically (a 2021 exploit led to some user losses)
• No deposit insurance — USDC deposits in Polymarket’s central pool are custodied and not FDIC-insured
• Resolution disputes — Polymarket uses UMA Protocol as an oracle/dispute system; high-profile market resolutions have occasionally been contentious
• No regulatory recourse — if something goes wrong, you have no regulator to complain to

Kalshi: Regulated Financial Infrastructure

As a CFTC-regulated DCM, Kalshi operates under a significantly stricter security and compliance framework:

• Segregated customer accounts — your funds are held separately from Kalshi’s operating capital, as required by CFTC rules
• No FDIC insurance — event contract exchanges are not banks; your cash is not FDIC-insured, but the segregation requirement provides meaningful protection
• Regulatory oversight — CFTC can investigate disputes, mandate refunds, and take enforcement action against Kalshi
• Audited financials — Kalshi is subject to financial reporting requirements
• Bankruptcy protection — if Kalshi became insolvent, customer assets in segregated accounts would be protected in most scenarios under CFTC rules

Winner: Kalshi on regulatory protection. The CFTC framework provides meaningful safeguards that simply don’t exist on Polymarket. However, for crypto-native users who self-custody their positions, Polymarket’s blockchain model has its own form of security.

Mobile App & Trading Interface Comparison

Polymarket: Web-First, Mobile-Responsive

Polymarket does not offer a native iOS or Android app as of April 2026. The platform operates exclusively through a web browser, though the mobile web experience is well-optimized and responsive. Key interface features:

• Clean card-based market listing with search and category filters
• In-depth market pages with price charts, order history, and community comments
• Simple buy/sell interface that abstracts most blockchain complexity
• Portfolio view showing open positions and P&L
• Real-time price updates via WebSocket connection
• Progressive Web App (PWA) support — you can add it to your home screen for an app-like experience

The absence of a native app is increasingly a competitive liability. Many casual users expect an app, and Polymarket’s web-only approach creates friction particularly for mobile-first users in emerging markets.

Kalshi: Native Apps on iOS and Android

Kalshi offers full-featured native apps on both iOS (App Store) and Android (Google Play). The app replicates nearly all of the web platform’s functionality including:

• Full market browsing with push notifications for price moves
• Biometric authentication (Face ID / fingerprint)
• One-tap order placement with saved settings
• Portfolio tracking with real-time P&L
• Market watchlist with price alerts
• In-app deposit and withdrawal management

The Kalshi app is particularly well-suited for following economic data releases. Users can set alerts for markets tied to Fed announcements or CPI releases and get notified instantly when prices move, all without opening a browser.

Winner: Kalshi on mobile experience. Native apps beat mobile web for the majority of users who spend significant time trading on their phones.

Platform Comparison Scorecard

Below is PredScope’s analytical scorecard rating both platforms across ten dimensions, scored out of 5.

Kalshi edges Polymarket in our overall scorecard, but this masks a critical nuance: Polymarket’s score is dramatically higher if you’re outside the US. For international traders, Polymarket scores roughly 45/50 while Kalshi scores 30/50, primarily because of access restrictions and lower market variety outside the US. The scoring above reflects the experience of the average global trader.

Who Is Each Platform Best For? (Detailed Use Cases)

Deposit & Withdrawal: Speed and Limits

Withdrawal speed is a real differentiator for traders who want to access winnings quickly. Polymarket’s on-chain withdrawals are effectively instant — your USDC hits your wallet in under a minute. Kalshi’s ACH withdrawals take business days. If you need cash quickly after a big win, Polymarket’s model (with a crypto account to receive into) is significantly faster.

Market Resolution: How Each Platform Settles Trades

Polymarket Resolution Process

Polymarket uses a combination of manual market creation with UMA Protocol as the dispute/oracle layer. Here’s how resolution works:

1. Each market has explicit resolution criteria written at creation
2. After the resolution date, Polymarket staff or automated systems propose an outcome
3. UMA token holders can dispute the proposed resolution
4. A dispute opens a 24-hour voting window where UMA token holders vote on the correct outcome
5. The majority vote determines final resolution
6. Winning shares are redeemable for $1 USDC each

This system has generally worked well, but high-profile disputes have caused controversy. The 2024 US presidential election markets resolved without incident, but some more ambiguous markets (e.g., “Will X happen before [date]?” questions) have led to contentious outcomes where users felt misled by resolution criteria.

Kalshi Resolution Process

Kalshi’s resolution process is more formalized as a CFTC-regulated exchange:

1. Markets have highly specific, legally-precise resolution criteria reviewed by CFTC
2. Resolution is based on official data sources (government reports, official announcements)
3. Kalshi’s compliance team verifies and posts resolution results
4. Formal dispute process available through CFTC if users disagree with resolution
5. Settlement typically occurs within 1 business day of event resolution

Kalshi’s resolution process is generally more predictable because the criteria must be precise enough to satisfy CFTC review. Ambiguous markets simply can’t be listed. This means fewer controversial resolutions but also fewer interesting or niche markets.

Winner: Kalshi on resolution clarity and dispute protection. The CFTC oversight provides a meaningful backstop.

Tax Reporting: What You Need to Know

Both platforms have different implications for your tax obligations. This is an often-overlooked comparison point that can significantly affect your net returns.

Polymarket and Taxes

Polymarket does not issue 1099 forms or any tax documentation. Your trading activity exists on the Polygon blockchain, and it is entirely your responsibility to track gains and losses. In the US, even though Polymarket is officially blocked, any US person who trades on it likely has taxable income from winnings under IRS rules.

For non-US users, your local tax authority’s rules apply. The on-chain nature of Polymarket means your trading history is fully transparent and verifiable — tax authorities in many countries are increasingly monitoring blockchain activity.

Kalshi and Taxes

As a regulated US exchange, Kalshi issues 1099-B forms for US traders who meet reporting thresholds. Kalshi treats event contract gains as short-term capital gains (similar to futures trading under IRS Section 1256 in some interpretations, though this remains an evolving area of tax law).

The 1099-B simplifies tax filing significantly compared to Polymarket. However, it also means there’s no hiding your Kalshi activity from the IRS — Kalshi reports your gains directly.

For a detailed guide on reporting prediction market profits, see our Prediction Market Taxes guide.

The PredScope Verdict: Our Recommendation

Frequently Asked Questions

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