Verdict
TL;DR
Polymarket is the deepest prediction market in the world by volume, and its on-chain settlement is trustworthy. If you're outside the US it's the default venue. If you're in the US, check current CFTC-registered access and consider Kalshi as an alternative.
Fees & liquidity
What it actually costs to trade
- Trading fee: 0%. You pay the bid/ask spread and Polygon gas (fractions of a cent).
- Deposit: free via USDC bridge; small processor fee for card/Apple Pay funding.
- Withdrawal: free on-chain; card withdrawals carry a network fee.
- Liquidity: flagship markets (US elections, BTC price, major sports) have millions in depth. The long tail is thin — spreads widen fast.
Regulation
CFTC status and US legality
In 2022 the CFTC fined Polymarket $1.4M for offering unregistered swaps to US persons and required it to wind down US access. Since then Polymarket has pursued CFTC-registered pathways for compliant US markets. Coverage in 2026 is partial and depends on state and market type.
Outside the US, Polymarket operates in 100+ countries. Users self-serve via the website and Polygon smart wallet.
Pros
What Polymarket does better than anyone
- Deepest liquidity in prediction markets — by a lot.
- Zero trading fee, on-chain and non-custodial.
- Fast product velocity — new markets go live within hours of news.
- Sellable positions before resolution.
Cons
Where it falls short
- US access is partial and evolving.
- Oracle disputes can delay payouts on contested markets.
- Long-tail markets are thin — spreads and slippage are real costs.
- Learning curve for on-chain concepts, even with card funding.
Head-to-head against the CFTC-regulated US alternative in the Polymarket vs Kalshi comparison.
FAQ
Frequently asked questions
Yes. Polymarket is the largest prediction market by volume, with billions in cumulative trading. Contracts are settled on-chain via the UMA optimistic oracle. Payouts are automatic and non-custodial — the platform can't withhold winnings.
As of 2026, Polymarket has restored limited US access under CFTC-registered channels after a period of restriction. Coverage varies by state and market type. US residents seeking a fully-regulated venue often use Kalshi.
The CFTC previously fined Polymarket for offering unregistered event contracts to US persons in 2022. Polymarket has since pursued CFTC-registered pathways for compliant US access. Always check current status before depositing.
On-chain-only settlement means resolution disputes can take days. Liquidity is deep on flagship markets and thin on the long tail. And regional restrictions still apply — especially for US users.