⚖️ Polymarket vs Kalshi — how the two prediction markets differ

Polymarket and Kalshi are the two largest prediction markets, and they answer the same question with very different plumbing. Both let you trade YES/NO shares on real-world events, priced in cents and redeemed at $1 if your outcome occurs. The differences are underneath: how each is regulated, where each is available, how trades settle, and what that settlement layer makes possible. This page compares them factually — both are serious, functioning venues, and which fits you depends on where you live and what you want from the platform.

The same instrument, two architectures

If you understand how a prediction market works, you understand both platforms. Each turns a real-world question into tradeable YES/NO shares, prices them in an order book of participants (not against a bookmaker — see prediction markets vs betting), and redeems the winning side at $1. Buy YES at 40¢ on either venue and the mechanics of your position are essentially the same.

Everything below is about what sits under that instrument.

Regulation and availability

Kalshi (kalshi.com) is a US financial exchange: the CFTC designated KalshiEX LLC as a Designated Contract Market in November 2020, and its event contracts trade under US federal derivatives regulation. It began as a US-only platform; starting in late 2025 it also opened access to users in many countries outside the US, with a list of restricted jurisdictions — Kalshi's help center is the source of truth for where it currently operates and under what terms.

Polymarket (polymarket.com) launched in 2020 as a global, blockchain-based platform. It exited the US market in early 2022 following a CFTC settlement, then returned: it acquired a CFTC-licensed exchange and clearinghouse (QCX) in 2025, and as of December 2025 began relaunching in the US through that regulated entity, initially with a limited, sports-focused rollout. Outside the US it continues to operate globally, with its own restricted jurisdictions.

Both platforms' availability maps have changed repeatedly and will likely change again — treat their official pages, not third-party articles (including this one), as current.

Settlement: dollars in an account vs tokens on a chain

This is the deepest structural difference.

• On Kalshi, you deposit dollars, the exchange credits your account, and contracts settle in dollars through a regulated clearinghouse. Your positions and history are private to you, as on a brokerage.
• On Polymarket, trading happens against an order book whose trades settle on-chain on Polygon. Balances are held in pUSD — Polymarket's USDC-backed stablecoin (as of 2026; see What is pUSD) — and positions are tokens in a wallet. That means every wallet's full trading history is public: anyone can verify on a block explorer what any trader bought, sold and resolved.

Neither model is simply "better". Dollar settlement on a regulated clearinghouse is familiar and private; on-chain settlement is transparent and composable — other software can read it and build on it.

Fees

Both platforms charge trading fees, and both schedules have changed over time — as of mid-2026, Kalshi uses a price-dependent per-contract fee formula, while Polymarket charges taker fees that vary by market category. Neither is meaningfully "the free one" anymore, and the honest comparison is always the full round trip: explicit fees both ways plus spread and slippage, which Polymarket trading costs, explained walks through. For current numbers, use the official sources: Kalshi's help center and Polymarket's documentation.

What trades on each

Both list politics, economics, sports, weather, culture and more; Polymarket also runs crypto markets, and each venue has categories the other lacks at any given moment. Contract catalogues shift constantly — if one specific market matters to you, check both sites directly rather than relying on category lists.

Choosing between them

There is no universal answer, but the decision usually reduces to:

• Jurisdiction first. Where you live may decide the question for you — check each platform's current availability.
• Regulatory home. If you want a US-regulated exchange with dollar settlement, that is Kalshi's design. Polymarket's US product now also operates through a CFTC-licensed entity, while its global platform remains on-chain.
• Transparency and tooling. If public, verifiable trading histories matter to you — for studying other traders or using third-party tools — that only exists where settlement is on-chain, which is Polymarket's design.

Where Polyfox fits

Polyfox is an independent Telegram trading terminal built for Polymarket — it is not affiliated with Polymarket or Kalshi. It exists on the Polymarket side of this comparison for a structural reason: because Polymarket's trades settle on-chain and every wallet's history is public, software can do things that are impossible on a private ledger — rank wallets by their verifiable records (Smart Wallets), replay a wallet's history against your own settings, and copy trade with every mirrored order checkable on-chain. All performance figures involved are historical data, not a forecast.

This page is informational only and is not investment or legal advice; platform details above are accurate to the best of our knowledge as of mid-2026 and can change — see Legal notes.

Next steps

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