Polymarket vs Kalshi

The short version

• Kalshi is a US-regulated exchange (overseen by the CFTC), funded in dollars. If you're in the United States, it's a straightforward, compliant option.
• Polymarket is crypto-based and global. If you're outside the US and comfortable with crypto, it offers the deepest liquidity and widest market selection. US users now have a separate regulated product, Polymarket US.
• Both are real, operating prediction markets — not demos, not scams, and not the same company. The right choice mostly comes down to where you live and how you want to fund your account.

Regulation: the biggest difference

Kalshi operates as a designated contract market regulated by the US Commodity Futures Trading Commission. That means formal oversight, standardized contracts, and a clear legal framework for American users — the tradeoff being that regulators get a say in what can be listed. Kalshi has fought public legal battles over whether certain markets (notably election markets) are permitted, and won key rounds.

Polymarket took the opposite route: built on blockchain rails, funded with crypto, and historically serving users outside the US. It settled with the CFTC years ago and has kept its distance from the American market since. Less regulatory friction on listings means a broader, weirder catalog of markets — but also less formal consumer protection if something goes wrong.

What you can trade

There's heavy overlap — politics, economics, crypto, culture, sports championships — but the catalogs differ in flavor:

• Polymarket tends to list more markets, faster, including niche and pop-culture topics. Its 2024 US election markets drew enormous volume and mainstream attention.
• Kalshi lists fewer, more standardized contracts, often structured as yes/no ranges on economic data (inflation prints, Fed decisions, jobs numbers). Its catalog is curated for the regulatory environment it lives in.

If you want the widest menu and don't mind crypto, Polymarket wins on selection. If you want clean, standardized economic contracts with a regulator watching, Kalshi has the edge.

Fees and funding

The platforms monetize differently, and both change their schedules periodically — always check the current fee page before sizing up:

• Polymarket is funded with crypto (typically USDC). Deposits and withdrawals carry blockchain network costs, and trading costs show up mainly in spreads on the order book. See our fees guide.
• Kalshi funds like a normal financial account — bank transfer or debit card in dollars — and charges explicit per-contract trading fees.

Kalshi's dollar rails are friendlier for beginners who've never touched crypto. Polymarket's crypto rails are cheaper for people already living on-chain, but add a learning curve (wallets, networks, gas) if you're new.

Which one suits you?

• You're in the US: Kalshi and the separate Polymarket US product are the compliant choices. The global Polymarket site has historically not served US users.
• You're outside the US and crypto-comfortable: Polymarket offers deeper liquidity and more markets.
• You're outside the US but crypto-averse: Kalshi may still accept you depending on jurisdiction — check its current availability.
• You mainly want to read prices, not trade: both publish prices publicly; Polymarket's broader catalog makes it the better sentiment dashboard.

The honest downsides of both

Neither platform is perfect. Both suffer from wide spreads and thin liquidity on niche markets, both have seen resolution controversies on ambiguously worded questions, and both carry regulatory risk — Kalshi from future rule changes, Polymarket from operating in a gray zone in some jurisdictions. And on both, the uncomfortable truth holds: the crowd you're trading against includes professionals, and most retail traders lose money over time.