Both are prediction markets (you bet "yes/no" on real-world events), but they're built for very different audiences. Here's how they stack up — per DefiLlama:
Polymarket
- Crypto-native, runs on Polygon. You deposit USDC and trade on politics, macro, sports, etc.
- Per DefiLlama: $347.6M TVL, ~$59.4M daily volume, ~$814K daily fees, ~$338K protocol revenue.
- Pseudonymous, permissionless, world-accessible — but not available to US persons, and markets are priced in crypto (USDC).
- Sites: Polymarket · Twitter
Kalshi
- CFTC-regulated event-derivatives exchange (a licensed, real-money venue). You trade yes/no contracts on election, Fed, weather, sports outcomes.
- Per DefiLlama: $365M daily volume (USD) — no crypto TVL since it's a fiat exchange, not a DeFi pool.
- Legal in the US, regulated, USD-denominated — but requires KYC/account setup and you're dealing with a centralized counterparty rather than smart contracts.
- Sites: Kalshi · Twitter
Which is "better" depends on your situation:
- If you're in the US and want full legal clarity → Kalshi, since Polymarket blocks US users.
- If you want crypto-native, pseudonymous, self-custodied trading with deeper "anything goes" event coverage → Polymarket.
- Regulation vs. speed: Kalshi is the regulated, fiat, KYC route; Polymarket is the decentralized, USDC, no-KYC route — those are the real trade-offs, more than features.
A couple of caveats: Kalshi's volume figure reflects fiat exchange volume (not comparable 1:1 with an on-chain protocol's), and DefiLlama's numbers for both are daily snapshots, not guarantees of future activity. Neither is an investment "buy" — you're trading event contracts, so you can win or lose on each one.