Polymarket vs Kalshi (2026)

Quick Overview

Polymarket and Kalshi are the world's two most-traded prediction market platforms as of 2026. Both let you trade YES/NO contracts on real-world events — from elections to Fed rate decisions to crypto prices — but they differ fundamentally in structure, regulation, and who can access them.

US Access & Regulation

This is the single biggest differentiator between the two platforms.

Kalshi is a CFTC-regulated Designated Contract Market — the same regulatory category as CME Group. It secured this status in 2020 and is the only major prediction market platform fully legal for US residents. All Kalshi contracts are settled in USD via standard bank transfers.

Polymarket agreed to a CFTC settlement in 2022 and subsequently blocked US IP addresses. US residents cannot legally access Polymarket. Non-US users (Europe, Latin America, Asia-Pacific) can use Polymarket freely — it operates on the Polygon blockchain with no central entity controlling access for non-US jurisdictions.

Fees Compared

Fee structures are fundamentally different — which matters a lot for active traders.

Polymarket Fees

Polymarket charges a 2% fee on net winnings only. If you lose a position, you pay no fee — your full stake goes to the counterparty. The 2% is taken from your profit at resolution. Example: you buy 100 YES shares at 60¢, they resolve to $1.00. Gross profit = $40. Fee = $0.80. Net profit = $39.20.

Kalshi Fees

Kalshi charges a per-trade fee at execution, typically 1–7% of the contract face value depending on the market. Fees are charged whether you win or lose. This structure is more expensive for high-frequency traders but predictable for position sizing.

Which Is Cheaper?

For low-frequency, high-conviction trades: Polymarket wins — you only pay if you profit. For high-frequency trading or scalping: compare per-market, as Kalshi's flat fee can be lower in thin markets. For losing trades: Polymarket is strictly cheaper (zero fee on losses).

Liquidity & Market Depth

Polymarket dominates on liquidity. Major Polymarket markets — US elections, Bitcoin price targets, Fed rate decisions — regularly see $5M–$50M+ in active open interest. Tight spreads of 1–3¢ are typical on top markets.

Kalshi has grown substantially but most markets still have $50K–$500K in active positions. Spreads are wider (3–10¢ on typical markets). For traders moving $1,000+ per trade, Polymarket's depth is a significant advantage.

Market Selection

Polymarket currently hosts 1,000+ active markets spanning US and global politics, crypto prices, economic indicators, sports, and geopolitical events. New markets are created by the community and must pass a resolution criteria review.

Kalshi focuses on 200–500 markets with a US-centric focus: Fed rate decisions, inflation data, election outcomes, economic reports. As a CFTC DCM, Kalshi must get regulatory approval for each new market category — this limits breadth but ensures legal clarity.

KYC & Account Setup

Polymarket requires no KYC for standard trading. You connect a Web3 wallet (MetaMask, Coinbase Wallet, etc.), deposit USDC, and start trading in under 5 minutes. There is no account creation in the traditional sense.

Kalshi requires full KYC (government ID + selfie) as a regulated financial entity. Setup takes 1–3 days for verification. Once verified, you link a bank account and fund via ACH or wire transfer in USD.

Funding & Withdrawals

Polymarket: Fund via USDC on Polygon network. Buy USDC on any exchange (Kraken, Coinbase, Binance), bridge or send to Polygon, connect wallet to Polymarket. Withdrawals are near-instant on-chain. Full self-custody of funds.

Kalshi: Fund via US bank ACH (free, 1–3 business days) or wire transfer. Withdrawals go back to your bank account in 1–5 business days. No crypto required.

Verdict: Which Should You Use?

The honest answer for most non-US traders: start with Polymarket for the liquidity and market selection. If you find yourself wanting US-regulated exposure or prefer USD/bank funding, add Kalshi.