Polymarket vs Kalshi vs PredictIt: which prediction market is best?

The prediction market ecosystem in 2026 is dominated by three platforms: Polymarket, Kalshi, and PredictIt. They look similar from the outside — bet YES or NO on a real-world event — but they serve different users and operate under different rules. This comparison helps you pick the right one for your situation.

At a glance

Polymarket — biggest, crypto-native

Best for: users outside the US/UK/France who want the largest market selection and lowest fees. Polymarket has the widest coverage by far — every major news event has a liquid market. The crypto-native setup (USDC on Polygon) is a hurdle for beginners but buys you zero trading fees and instant settlement.

Downside: geo-restrictions (US, UK, France, Singapore, Taiwan, Ontario), requires a crypto wallet, and the decentralised resolution process occasionally produces disputed outcomes that take days to resolve.

See our Polymarket starter guide.

Kalshi — US-legal, CFTC-regulated

Best for:US residents who want legal, regulated prediction market exposure. Kalshi operates under a Designated Contract Market licence from the CFTC. Fully KYC'd, fiat-USD based, real consumer protections.

Downside:smaller selection of markets (~500 vs Polymarket's 1,500+), higher fees (0-5% variable), and restricted to topics that pass regulatory review (so no “celebrity X does Y” type markets).

PredictIt — academic, tiny, political

Best for: US users who want to bet small on political markets specifically. PredictIt operates under a no-action letter from the CFTC as an academic research project (Victoria University of Wellington, NZ).

Downside: $850 per-market position cap, 10% fee on winnings, 5% withdrawal fee, and only ~100 markets — mostly US elections and a few sports categories. The fees + position cap make it the least serious option for actual alpha hunting.

Our verdict

• From outside the US/UK: Polymarket, no question. Biggest market, zero trading fees, best liquidity. Use our starter guide.
• US resident, want legal exposure: Kalshi. Regulated, fiat-based, real consumer protections.
• US resident, want political markets with small stakes: PredictIt works but the fees are painful.
• UK resident: Neither Polymarket nor Kalshi accepts UK users. See our UK guide for the practical options.

Which does PolyGuru work with?

PolyGuru's signal engine analyzes Polymarket specifically — we track every active Polymarket market and surface the best picks. Our signals are prices-aware (vs Polymarket's crowd consensus) so they don't directly translate to Kalshi or PredictIt, but the underlying probability estimate is platform-independent: if we say Event X is 70% likely, that's our view of the world, applicable on any platform where you can bet on it.