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Kalshi Polymarket Arbitrage: How to compare and capture spreads

If you search "kalshi polymarket arbitrage" you want to know whether price differences between Kalshi and Polymarket can be traded profitably and how to execute them. Kalshi is a centralized, CFTC-focused exchange; Polymarket is a decentralized CLOB running on Polygon with pUSD settlement. Cross-platform spreads can exist but require cross-protocol execution, KYC on some venues, and additional risks beyond intra-Polymarket arbitrage.

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What Kalshi is and how it differs from Polymarket

Kalshi is a centralized exchange regulated under the CFTC that lists event contracts denominated in USD and typically requires KYC for trading. Polymarket is a decentralized prediction market built on Polygon using pUSD and Gnosis's CTF, with gasless trading via Polymarket's Relayer. The difference in custody, settlement rails, and regulatory treatment means arbitrage between the two involves more than just price: there is KYC friction, withdrawal timing, and sometimes different contract definitions.

Where arbitrage shows up and the practical barriers

Cross-platform arbitrage appears when the same event trades at different implied probabilities on each venue. Capturing that spread means executing on both sides fast enough to lock profit before prices move. Practical barriers include KYC limits, differing contract structures, fee schedules, funding and withdrawal delays, and geographic restrictions enforced by Polymarket and other platforms.

Why intra-Polymarket arbitrage is simpler

Intra-market arbitrage on Polymarket (buying a complete set within one market) avoids cross-venue settlement, KYC mismatches, and many timing issues. Polymarket's CLOB, pUSD rails, and CTF split/merge operations let you lock an edge when Σ bestAsk < $1.00. That edge is mathematical before fees and settlement risks, but you must account for UMA resolution disputes, slippage, partial fills, and taker fees.

How PolyArb fits into this workflow

PolyArb is a non-custodial arbitrage bot designed for Polymarket users: $99/month, 40ms latency vs ~800ms for free bots, and a stated $7.62 minimum guaranteed edge per trade. It runs live today and sends Telegram and Discord alerts. For traders focused on quick intra-Polymarket opportunities, PolyArb reduces execution latency and surfaces combinatorial and binary edges while leaving settlement and wallets under your control.

Risks to keep in mind

Never treat an observed spread as unconditional profit. Resolution risk (UMA disputes), slippage, partial fills, fee changes, smart-contract risk, and geo restrictions can all reduce or negate an apparent edge. Cross-platform arbitrage adds KYC, funding, and withdrawal timing risks that make it materially different from intra-Polymarket strategies.

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FAQ

Can I arbitrage the same contract between Kalshi and Polymarket?
Sometimes, if the event definitions match closely and you can access both platforms. Expect KYC, different contract terms, funding and withdrawal timing, and execution risk. These add friction that intra-Polymarket arbitrage avoids.
Is PolyArb a custodial service?
No. PolyArb is described as non-custodial: it automates order placement and alerts while you retain control of your wallet and pUSD.
What makes Polymarket arb faster than cross-platform arb?
Polymarket intra-market arb runs on a single CLOB and the same settlement rails (pUSD and CTF), so you avoid cross-venue transfers, KYC mismatches, and external withdrawal delays that slow down cross-platform trades.
Does Polymarket charge gas or maker fees?
Polymarket sponsors gas through its Relayer. Maker fees are zero; taker fees vary by category (0% to 1.8%). Fee differences should be included when calculating any arbitrage.

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