Overview
For traders looking to capitalize on price discrepancies across prediction markets, the ArbBets vs EventArb comparison is a natural starting point. Both tools are active cross-market arbitrage scanners that include Kalshi — the CFTC-regulated event contract exchange — among their supported platforms. They serve traders who want to identify situations where the same or related outcomes are priced differently across markets, allowing for potential risk-reduced profit opportunities. As Kalshi continues to grow its catalog of event contracts settled in USD, having a reliable arbitrage tool integrated with its REST and WebSocket Trading API becomes increasingly valuable.
ArbBets, accessible via Polymark, positions itself as a broad prediction market arbitrage tool with Kalshi as one of its supported venues. EventArb, available at eventarb.com, focuses specifically on event-contract markets and explicitly includes Kalshi in its scanning scope. Both tools fall under the cross-market tag, meaning they look for arbitrage opportunities that span multiple platforms rather than within a single exchange. The differences between them, while not extensively documented in public-facing materials, are worth examining for traders deciding where to direct their attention and capital.
ArbBets vs EventArb: Key Differences
| Feature | ArbBets | EventArb |
|---|---|---|
| Primary Function | Cross-market arbitrage scanning for prediction markets including Kalshi | Cross-market arbitrage scanning focused on event-contract markets including Kalshi |
| Target User | Prediction market traders seeking arbitrage across multiple platforms | Traders specializing in event-contract arbitrage across dedicated event markets |
| Platform / Interface | Accessible via the Polymark product directory (polymark.et) | Standalone web platform at eventarb.com |
| Automation Level | Not available | Not available |
| Pricing | Not available | Not available |
| Key Strength | Broad prediction market coverage with Kalshi included in cross-market scanning | Dedicated focus on event-contract markets, aligning closely with Kalshi's market structure |
| Best For | Traders who operate across a wide range of prediction market platforms | Traders whose activity centers specifically on event-contract exchanges like Kalshi |
When to Choose ArbBets
ArbBets is a reasonable choice for traders who already operate across multiple prediction market platforms and want a single tool that can surface opportunities wherever they arise, including on Kalshi. Its listing through Polymark suggests it fits into a broader ecosystem of prediction market utilities, which may appeal to traders who use several tools in combination.
- You trade on multiple prediction market platforms and want consolidated cross-market arbitrage scanning that includes Kalshi alongside other venues.
- You prefer tools discovered and vetted through aggregator directories like Polymark, which can simplify the process of evaluating the prediction market tool landscape.
- You want a general-purpose arbitrage scanner rather than one narrowly scoped to event-contract markets specifically.
When to Choose EventArb
EventArb's explicit focus on event-contract markets makes it a strong candidate for traders whose primary activity is on Kalshi and similar event-based exchanges. Its standalone platform and dedicated domain suggest a product built specifically around the mechanics of event contracts, which mirrors Kalshi's own market structure of binary and multi-outcome event settlements in USD.
- Your trading activity is concentrated on event-contract markets, and you want a tool purpose-built for that specific market structure rather than a general prediction market scanner.
- You prefer a dedicated, standalone platform that you can access directly without going through a third-party directory or aggregator.
- You are focused on Kalshi and other event-contract exchanges and want a scanner whose design is tailored to how those markets operate.
Verdict
Both ArbBets and EventArb are active, cross-market arbitrage tools that include Kalshi in their scanning scope, and neither has enough publicly documented detail to declare a clear overall winner on features, pricing, or performance. The honest distinction comes down to scope and focus: ArbBets suits traders who want broad prediction market coverage and are comfortable working within the Polymark ecosystem, while EventArb is the stronger fit for traders who are primarily active on event-contract markets like Kalshi and want a purpose-built, standalone tool that speaks directly to that market structure. If your trading is Kalshi-centric, EventArb's dedicated focus gives it a slight edge by design; if you operate across many platforms, ArbBets may offer more relevant breadth.