Overview
For traders looking to capitalize on price discrepancies across prediction markets, the comparison of PolyArbitrage (Chrome Extension) vs EventArb is a practical starting point. Both tools are actively available and designed to help users identify arbitrage opportunities involving Kalshi, the CFTC-regulated event contract exchange. They operate in a space where the same real-world event may be priced differently across platforms, creating short windows for risk-reduced profit. Understanding how each tool approaches this problem is essential before committing time or capital to either.
PolyArbitrage (Chrome Extension) is a browser-based tool focused specifically on surfacing price differences between Polymarket and Kalshi. It integrates directly into the Chrome browser, meaning traders can monitor opportunities without leaving their existing workflow. EventArb, by contrast, takes a broader approach — scanning for arbitrage across multiple event-contract markets, with Kalshi included as one of its supported platforms. Both tools serve active Kalshi traders, but they differ significantly in scope, interface, and intended use case.
PolyArbitrage (Chrome Extension) vs EventArb: Key Differences
| Feature | PolyArbitrage (Chrome Extension) | EventArb |
|---|---|---|
| Primary Function | Surfaces arbitrage opportunities between Polymarket and Kalshi | Scans for arbitrage across multiple event-contract markets including Kalshi |
| Target User | Traders active on both Polymarket and Kalshi | Traders seeking cross-market arbitrage across a wider range of platforms |
| Platform / Interface | Chrome browser extension | Web application |
| Automation Level | Passive opportunity surfacing within the browser | Automated market scanning across event-contract platforms |
| Pricing | Not available | Not available |
| Key Strength | Lightweight, browser-integrated, focused Polymarket-to-Kalshi coverage | Broader market coverage across multiple event-contract exchanges |
| Best For | Traders who primarily work across Polymarket and Kalshi | Traders who want a centralized view of arbitrage across many prediction markets |
When to Choose PolyArbitrage (Chrome Extension)
PolyArbitrage (Chrome Extension) is the right pick for traders who already split their activity between Polymarket and Kalshi and want a frictionless way to catch price discrepancies without adding another dashboard to their routine. Because it lives in the browser, it fits naturally into an existing trading workflow rather than requiring a separate platform to monitor.
- You regularly trade on both Polymarket and Kalshi and want real-time visibility into price gaps between the two platforms.
- You prefer a lightweight, browser-native tool that doesn't require logging into a separate web application.
- Your arbitrage strategy is focused specifically on the Polymarket-Kalshi pair rather than a broad multi-platform approach.
When to Choose EventArb
EventArb is the stronger option for traders who operate across a wider prediction market landscape and want a single tool that aggregates arbitrage signals from multiple event-contract platforms. Its web application format suggests a more structured, feature-rich environment suited to traders who treat cross-market arbitrage as a core strategy rather than an occasional opportunity.
- You trade across several event-contract markets beyond just Polymarket and Kalshi and need consolidated scanning in one place.
- You prefer a dedicated web application with a full interface rather than a browser extension overlay.
- Your workflow benefits from broader market coverage, allowing you to prioritize the most attractive arbitrage spreads across all available platforms.
Verdict
Both tools are actively maintained and genuinely useful for Kalshi traders pursuing arbitrage strategies, but they serve different scopes. PolyArbitrage (Chrome Extension) wins for simplicity and focus — if your entire arbitrage operation centers on the Polymarket-Kalshi corridor, it's a fast, low-overhead solution that works inside your browser. EventArb wins on breadth — traders who want a wider lens across the event-contract market landscape will benefit from its multi-platform scanning approach. Neither tool publicly discloses pricing, so due diligence on cost is required before committing to either. In short, choose PolyArbitrage (Chrome Extension) for targeted, two-platform arbitrage and EventArb when you need a more comprehensive, multi-market view.