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

The short answer

If you're in the United States, use Kalshi — Polymarket geo-blocks U.S. IPs as part of its CFTC settlement. If you're outside the U.S., or you want the deepest liquidity on political and crypto markets, use Polymarket. The two platforms aren't really competitors in most jurisdictions; they serve different users.

Regulation and settlement

Kalshi is a CFTC-regulated Designated Contract Market (DCM). Funds sit at a U.S. bank, contracts settle in USD, and the company is subject to U.S. derivatives oversight. Polymarket is a decentralized order book deployed on Polygon. Trades settle in USDC, custody is non-custodial via a smart-contract proxy wallet, and resolution is handled by the UMA optimistic oracle. The trade-off is regulatory clarity vs. permissionlessness.

Fees

Polymarket charges 0% trading fees on the vast majority of markets — you pay only Polygon gas (cents). Kalshi typically charges per-contract fees that work out to roughly 1–4% of the contract notional, depending on the market and whether you're a maker or taker. Over hundreds of trades, this fee differential matters.

Liquidity and market catalog

Polymarket has dramatically more total volume and open interest in 2026, especially on: U.S. and global elections, geopolitical events (war, regime change), crypto prices, AI milestones, and pop culture (awards, sports controversies). Kalshi dominates in U.S. economic data (CPI, Fed decisions, jobless claims), select sports, and American political markets where regulated status is required.

Trading mechanics

• Order book: both platforms run a true CLOB, not an AMM. Spreads are tight on top markets and wide on niche ones.
• Contract structure: identical — each share pays $0.00 or $1.00, current price = implied probability.
• Funding: Kalshi accepts ACH, debit, and wire. Polymarket accepts USDC on Polygon (with built-in bridge from other chains and a fiat onramp).
• Mobile: Kalshi has native iOS/Android apps. Polymarket is a polished mobile web app.

Tax treatment

Kalshi gains are taxed as event contract income — many fall under IRS Section 1256 (60/40 long/short-term capital gains), and Kalshi will issue a 1099. Polymarket gains are treated as crypto-denominated capital gains in the U.S. and most other jurisdictions; there is no 1099, so you are responsible for tracking USDC cost basis. Tax software like Koinly or CoinTracker can pull Polymarket activity from your wallet address.

Which one should you use?

For most international traders, the answer is Polymarket — broader catalog, zero fees, deeper political liquidity. For U.S. residents the answer is Kalshi by default, with the regulated framework and U.S. banking rails. If you have access to both, you can sometimes run cross-platform arbitrage on overlapping markets (e.g. major U.S. elections), though settlement latency and geo-restrictions make this hard to scale.

Whichever you use, the smart-money edge is the same: identify the wallets that consistently make money and watch what they buy. QuantFox tracks the top 100 most profitable Polymarket wallets in real time.