Polymarket vs Kalshi: Prediction Markets Compared for 2026
By DifiCalc Research Team · Published Sep 10, 2026 · Reviewed Sep 10, 2026
TL;DR — the quick verdict. The decision is mostly about where you live and how you want to hold money. Polymarket is the global, crypto-native liquidity leader — Polygon, USDC settlement, near-zero fees and the deepest event markets — but it restricts US users after its CFTC settlement. Kalshi is the only CFTC-regulated event-contract exchange in the US, with fiat bank rails and no smart-contract risk, but it is US-only and not on-chain. Outside the US, use Polymarket; inside the US, use Kalshi.
| Polymarket | Kalshi | |
|---|---|---|
| Founded | 2020 | 2021 |
| TVL / escrow (Sep 2026) | ≈ $0.2B on Polygon | ≈ $0.15B, custodial/regulated |
| Settlement asset | USDC on Polygon | USD via bank transfer |
| US access | Restricted after CFTC settlement | Legal — CFTC-regulated, US-only |
| Trading fees | 0% on most markets | 0% on most markets |
| Audits / oversight | 48 public audits; smart contracts on Polygon | 18 audits; CFTC oversight, no on-chain contract risk |
| Strength | Deepest global event liquidity, widest market creation | Fiat rails and regulatory certainty for US users |
| DifiCalc risk grade | A- | A+ |
| Full review | Polymarket review | Kalshi review |
TVL and APY figures reviewed Sep 10, 2026 against live data and protocol documentation; rates move daily — verify current numbers before depositing. See our review methodology.
Legal access: the real deciding factor
Polymarket reached a settlement with the CFTC and blocks US-based trading on its main markets; its product is built for a global, crypto-comfortable audience. Kalshi operates under CFTC regulation as a designated contract market and is explicitly built for US customers, with compliance and KYC around fiat accounts.
Regulation changes — verify current access terms on each official site before signing up, and do not rely on workarounds that violate terms of service or local law.
Custody, funding and settlement
Polymarket trades and settles in USDC on Polygon: you bridge or buy USDC, hold it in a self-custodial or exchange wallet, and bear smart-contract, stablecoin-depeg and bridge risk in exchange for permissionless, near-instant withdrawals. Kalshi never touches crypto: funds move by bank transfer (ACH is free), contracts resolve off-chain and there is no wallet or gas.
Crypto-native users generally prefer Polymarket's composability; users who want prediction exposure without a wallet prefer Kalshi.
Markets, liquidity and fees
Both charge 0% trading fees on most markets in 2026, so the practical difference is depth and coverage. Polymarket leads globally on election, crypto, sports and culture markets with the most active market-making and API ecosystem. Kalshi has been aggressively adding election, weather, sports and economic-event markets and is often the deepest regulated book available to US users. Compare the bid/ask spread and size available at your target contract — that, not the headline fee, is your real cost.
Risk profile
Polymarket carries platform and oracle/resolution disputes on top of crypto-infrastructure risk (Polygon contracts, USDC); its A- grade reflects that broader risk stack. Kalshi's A+ reflects regulated custody, CFTC oversight and the absence of smart-contract risk, offset by counterparty and regulatory concentration in a single US operator.
On both, event-contract pricing can be mispriced near resolution and binary outcomes mean total loss of the contract premium is routine.
How to choose in 4 steps
- Check access first: if you are in the US, Kalshi is the regulated option; Polymarket is for eligible non-US users.
- Decide custody: USDC on Polygon with a wallet (Polymarket) versus USD bank rails (Kalshi).
- For your specific event, compare order-book depth and the bid/ask spread on both venues rather than the zero-fee headline.
- Treat positions as binary-risk capital, understand resolution rules before trading, and never deposit more than you can lose.
Frequently asked questions
Can people in the United States use Polymarket?
Polymarket restricts US users on its main markets following its CFTC settlement. US residents who want regulated event contracts should use Kalshi, and users elsewhere should verify the current terms on Polymarket's official site.
Is Kalshi built on a blockchain?
No. Kalshi is a CFTC-regulated, custodial exchange that settles contracts in US dollars through bank transfers. It carries no wallet, gas or smart-contract risk, which is exactly why it is accessible to non-crypto users.
Which platform has lower fees?
Both advertise 0% trading fees on most markets in 2026. The effective cost is the bid/ask spread and any resolution or withdrawal charge; compare the actual spread at your trade size, and note that Polymarket users additionally pay Polygon gas and any on/off-ramp costs.
Where is liquidity deeper?
Polymarket is the global liquidity leader across the widest range of event categories and has the most active API ecosystem. Kalshi is often the deepest regulated venue open to US users and has expanded its election and economic-event coverage rapidly. Check the specific market.
What are the main risks on each?
Polymarket adds crypto layers — Polygon smart contracts, USDC stability, bridges — plus resolution disputes. Kalshi removes those but concentrates risk in a single regulated custodian and is US-only. On both, binary contracts routinely expire worthless, so position sizing dominates.