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Polymarket vs Kalshi: which market fits your trading style?

Polymarket and Kalshi are both prediction-market platforms, but they target different users and infrastructure. Polymarket is a decentralized exchange on Polygon using pUSD, a CLOB, and UMA for resolution; Kalshi is a separate, US-facing platform operating under a different regulatory model. If you trade for arbitrage, PolyArb ($99/month) is built for Polymarket: 40ms latency, Telegram + Discord alerts, non-custodial, live today, and a $7.62 minimum guaranteed edge per trade.

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How Polymarket differs technically

Polymarket runs on Polygon (chain ID 137) and uses pUSD as the settlement asset. Outcome shares are ERC-1155 tokens via the Gnosis Conditional Token Framework and the order book is a Central Limit Order Book (CLOB). Resolution comes from the UMA optimistic oracle, and Polymarket sponsors gas via its Relayer so users trade gas-free.

How Kalshi differs at a high level

Kalshi is a separate, US-focused prediction market platform with a different legal and operational setup than Polymarket. It targets institutional and retail users under US regulation and therefore has distinct listing, settlement, and compliance flows. I'm not certain about Kalshi's exact fee structure or matching engine details; check Kalshi's own documentation for specifics.

Arbitrage implications for traders

On Polymarket intra-market arbitrage works by buying complementary outcomes when total best-ask is below $1.00; that same logic doesn't map identically across platforms because settlement, tokenization, and fees differ. Polymarket's CLOB and gasless Relayer make split/merge/redeem flows predictable, which benefits automated arbitrage bots. Remember: spreads are mathematical only after you account for fees, partial fills, resolution disputes, and settlement timing.

Why PolyArb is anchored to Polymarket

PolyArb is designed for intra-Polymarket arbitrage: it runs at 40ms latency (vs ~800ms for many free bots), sends Telegram and Discord alerts, remains non-custodial, and is live today. The service is $99/month and advertises a $7.62 minimum guaranteed edge per trade. Review risks—UMA disputes, slippage, and settlement delays—before trading.

Try PolyArb for Polymarket arbitrage today

Start a non-custodial trial of PolyArb ($99/month) to access 40ms latency, Telegram + Discord alerts, and the $7.62 minimum guaranteed edge on live Polymarket markets.

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FAQ

Is Polymarket the same as Kalshi?
No. Polymarket is a decentralized CLOB-based exchange on Polygon using pUSD and UMA; Kalshi is a separate, US-facing platform with different regulatory and settlement mechanics. They are distinct products.
Can I use the same arbitrage bot on both platforms?
Not directly. Cross-platform arbitrage requires adapters for different APIs, settlement models, and compliance constraints. PolyArb is purpose-built for Polymarket's mechanics and UX.
Does PolyArb guarantee profit on every trade?
PolyArb advertises a $7.62 minimum guaranteed edge per trade as a product feature. That edge still faces execution risks: slippage, partial fills, UMA disputes, fee changes, and settlement timing. Evaluate those risks before trading.
Where can I find Polymarket's API docs?
Polymarket publishes three REST APIs and a market WebSocket: Gamma (https://gamma-api.polymarket.com), Data (https://data-api.polymarket.com), CLOB (https://clob.polymarket.com), and the market WebSocket (wss://ws-subscriptions-clob.polymarket.com/ws/market).

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