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Kalshi vs Polymarket: which prediction market fits you?

Kalshi and Polymarket are both prediction-market exchanges, but they differ in market design, accessibility, and tech plumbing. Traders ask "Kalshi vs Polymarket" to decide where to trade, arbitrage, or scalp. This page compares the two objectively, highlights practical differences, and explains where PolyArb (our arbitrage bot) fits in.

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Core differences at a glance

Polymarket is a decentralized CLOB on Polygon using pUSD and Gnosis CTF outcome tokens; orders are gasless thanks to Polymarket’s Relayer. Kalshi is a centralized, regulated exchange (CFTC-cleared for certain products) with its own custody and settlement model. That makes Polymarket more native to crypto wallets and composability, and Kalshi more traditional-market friendly.

For a trader, the practical differences are execution latency, fee structures, and available instruments. Polymarket’s CLOB model exposes tick sizes, best bids/asks, and the ability to split/merge outcome tokens; Kalshi’s model centers on exchange-listed event contracts. Your choice depends on whether you prioritize decentralization and composability or regulated on‑ramp and traditional fiat rails.

Liquidity, fees, and market mechanics

Polymarket uses a central limit order book with binary and multi-outcome markets where fair-value outcome prices sum to $1.00, and maker fees are zero while taker fees vary by category. Liquidity can be fast-moving and fragmented; arbitrage opportunities often last seconds to minutes.

Kalshi’s fee and liquidity profile is governed by its centralized matching engine and regulatory setup. If you’re hunting intra-market arbitrage on Polymarket, tools that monitor best-ask sums across outcomes are essential—this is where PolyArb automates detection and execution.

Risk profile and practical considerations

Polymarket carries smart-contract, oracle (UMA), and settlement timing risks because it’s decentralized and resolution is optimistic. Disputes can pause settlement. Kalshi’s centralized model shifts some of those risks to platform custody and regulatory compliance.

Neither platform removes market risk. For arbitrage specifically, you must account for slippage, partial fills, fees, and resolution disputes. PolyArb is a non-custodial bot designed to lower execution latency and surface intra-market edges on Polymarket; it does not remove protocol or oracle risks.

Where PolyArb fits in

If your goal is automated intra-Polymarket arbitrage, PolyArb offers 40ms latency vs ~800ms for free bots, Telegram and Discord alerts, and a $99/month plan that advertises a $7.62 minimum guaranteed edge per trade. It is non-custodial and live today, focused on Polymarket’s CLOB and CTF mechanics.

If you prefer a regulated fiat-native venue, Kalshi is worth evaluating. If you trade on Polymarket, PolyArb is built specifically to capture intra-market combinatorial and binary edges faster and more reliably than generic tools.

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Subscribe to PolyArb ($99/month) for 40ms execution, real-time alerts, and automated intra-Polymarket arb workflows. See how faster detection and execution change your edge.

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FAQ

Is Kalshi or Polymarket better for arbitrage?
Polymarket is generally better suited to automated intra-market arbitrage because of its CLOB structure, outcome-token mechanics, and composability. Kalshi’s regulated model is different; it’s not optimized for the same tokenized outcome arbitrage strategies.
Can I use PolyArb on Kalshi?
PolyArb is built for Polymarket’s CLOB and CTF mechanics and does not support Kalshi. PolyArb is non-custodial and automates Polymarket-specific splits, orders, and detection of intra-market edges.
What risks should I consider when choosing between them?
Consider oracle and smart-contract risk, dispute and settlement delays on Polymarket, and custody or regulatory risks on Kalshi. Also account for liquidity, fees, slippage, and geographic access restrictions.
Does PolyArb guarantee profit?
PolyArb advertises a $7.62 minimum guaranteed edge per trade on qualifying strategies, but that does not eliminate protocol or market risks such as disputes, settlement timing, slippage, or fee changes.

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