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Polymarket Kalshi: how they compare for traders

If you searched "polymarket kalshi" you likely want a direct comparison for trading and arbitrage. Polymarket and Kalshi both offer event-based trading, but they differ in market plumbing, custody, and execution latency that matter to arburs. This article highlights the practical differences relevant to short-latency traders and shows where PolyArb (the Polymarket Arbitrage Bot) fits into that workflow.

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Core platform differences

Polymarket runs on Polygon and uses pUSD (Polymarket's wrapped USDC) for settlement, with outcome shares implemented as ERC-1155 tokens via the Gnosis Conditional Token Framework. Trading occurs on a Central Limit Order Book (CLOB) and Polymarket sponsors gas through a Relayer so users trade gas-free. Kalshi is a separate event-market platform; traders should compare custody, fee structure, API access, and regulatory constraints when choosing. For many arbitrage strategies the decisive factors are order-book latency, available APIs, and whether the platform allows automated routing.

Why latency and APIs matter for arbitrage

Arbitrage windows on event markets are often measured in seconds. Polymarket exposes dedicated APIs — Gamma, Data, and a CLOB endpoint — plus a Market WebSocket for real-time book updates. Those endpoints let bots detect intra-market edges (when outcome best-asks sum below $1.00) and execute split/merge CTF operations. If your bot sits on slower APIs or a higher-latency connection, spreads will evaporate before you can execute. That’s why execution latency and reliable market feeds are the practical bottlenecks for arburs.

Practical risks to consider

Even mathematically positive spreads carry risks: UMA resolution or disputes can delay settlement; partial fills or slippage can reduce realized edge; taker fees and changing fee schedules affect net profit; smart-contract or wallet deployment issues can add execution risk. Polymarket’s architecture (Relayer gas sponsorship, CTF tokens, and UMA) defines these operational trade-offs. Never assume any trade is free of risk. Successful arbitrage requires execution discipline and monitoring for oracle disputes and settlement timing.

Where PolyArb fits in

PolyArb is a non-custodial arb bot built for Polymarket traders. It runs at 40ms latency versus ~800ms for typical free bots, includes Telegram and Discord alerts, and guarantees a $7.62 minimum edge per trade. The service is live today, priced at $99/month, and designed for traders who need consistent low-latency execution and real-time notifications. If you trade across multiple platforms, use PolyArb for Polymarket-specific intra-market opportunities and pair it with your own checks when comparing against other venues like Kalshi.

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FAQ

Is Polymarket the same as Kalshi?
No. They are separate platforms with different technical stacks, fee models, and market access. Traders should compare APIs, custody, and regulatory constraints when choosing between them.
Can PolyArb trade on Kalshi?
PolyArb is built for Polymarket’s CLOB and CTF mechanics. It does not execute on other exchanges; if you need cross-platform tooling you should confirm supported integrations with the provider.
How does Polymarket settle trades?
Polymarket uses the Gnosis Conditional Token Framework for outcome tokens and the UMA optimistic oracle for resolution. After resolution, winning tokens are redeemable for $1.00 each.
What does the $7.62 minimum guaranteed edge mean?
PolyArb advertises a $7.62 minimum guaranteed edge per trade as part of its product offering—this is a product-level guarantee from PolyArb, not a platform feature of Polymarket. Always account for fees, slippage, and resolution risks when calculating net returns.

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