Polymarket vs Kalshi: Overview
Polymarket and Kalshi are the two dominant prediction market platforms for English-speaking traders. While they serve a similar purpose — letting you trade on the outcomes of real-world events — they differ significantly in structure, regulation, market selection, and user experience.
Understanding both is essential for any serious prediction market trader. The best traders use them together.
Polymarket
What it is: A decentralized prediction market built on Polygon (an Ethereum layer-2 blockchain). Fully on-chain, non-custodial, and open to global users without KYC requirements (for most jurisdictions).
Market selection: Polymarket has the broadest and most diverse market selection — sports, politics, crypto, science, entertainment, and emerging events. Markets are created permissionlessly by the community.
Liquidity: Polymarket is the most liquid prediction market globally, with hundreds of millions in monthly trading volume. Major sports markets often have $1M+ in liquidity.
Fees: Polymarket charges a 2% take on winnings (only on profitable trades).
Settlement: Markets resolve via UMA's Optimistic Oracle, a decentralized dispute resolution system.
Blockchain: Polygon (MATIC). USDC is the trading currency.
Kalshi
What it is: A US-regulated futures exchange approved by the CFTC (Commodity Futures Trading Commission). Centralized, custodial, and available to US residents.
Market selection: Kalshi focuses on regulated event categories — economic indicators (Fed rate decisions, CPI), weather events, political outcomes, and sports. Fewer markets than Polymarket, but each is officially sanctioned.
Liquidity: Lower liquidity than Polymarket overall, but growing rapidly. Economic and political markets are well-traded.
Fees: Kalshi charges a trading fee of approximately 7 cents per contract traded (varies by market).
Settlement: Centralized — Kalshi resolves markets based on official data sources.
Regulation: CFTC-regulated. This is both a feature (legal protection) and a limitation (stricter market rules, US-only access).
Key Differences at a Glance
| Feature | Polymarket | Kalshi |
|---|---|---|
| Regulation | Decentralized (unregulated) | CFTC-regulated |
| Custodial | Non-custodial (self-custody) | Custodial (Kalshi holds funds) |
| Market Range | Very broad | Narrower, regulated categories |
| Liquidity | Higher overall | Lower, growing |
| Currency | USDC on Polygon | USD (wire/ACH) |
| US Access | Restricted (geo-block) | Yes (US-only) |
| Fees | 2% of winnings | ~7¢ per contract |
Which Platform Should You Use?
The honest answer: both. Here's why:
- For sports markets: Polymarket has the deepest liquidity and broadest selection
- For US political and economic markets: Kalshi often has unique legal markets unavailable on Polymarket
- For arbitrage: When the same event is listed on both platforms, price discrepancies create risk-free profit opportunities
- For copy trading: Polymarket's on-chain transparency makes it the only platform where smart money tracking is possible
Cross-Platform Arbitrage: The Real Opportunity
The most compelling reason to use both platforms is arbitrage. Because prices are set independently on each exchange, the same event can have different implied probabilities across Polymarket and Kalshi. Clutch scans both platforms continuously and alerts you the moment a spread opens.
Cross-market prediction market arbitrage is a growing edge — and the traders using Clutch to capture it are systematically outperforming those who trade single-platform.
Getting Started with Both Platforms
- Polymarket: Connect a crypto wallet (MetaMask, Coinbase Wallet) and deposit USDC on Polygon
- Kalshi: Create an account, complete KYC (US residents only), and fund via bank transfer
- Clutch: Add the Clutch Telegram bot to monitor both platforms simultaneously — receiving alerts for smart money moves, arbitrage opportunities, and +EV setups as they happen