ArbBets is an arbitrage finder for Polymarket, Kalshi and Opinion that also offers an API for building your own bots. Arbitrage Agent Starter is a signal feed with step-by-step guides for both legs; you place the orders yourself. Here's how they compare.
| Feature | Arbitrage Agent | ArbBets |
|---|---|---|
| Type | Scanner + guided execution (automated execution in final testing) | Arbitrage finder with an API (Premium plan) |
| Markets monitored | Matched Kalshi–Polymarket catalogue | 990+ |
| Execution | Signals and guides today; automated execution planned for Operator | Manual in the app; API for automated trading (per its site) |
| AI matching | AI matching plus a resolution-rules check | Not stated on its site |
| Circuit breaker | In final testing — auto-unwind on partial fill | Not stated on its site |
| Kelly sizing | Operator plan (coming soon) | Not stated on its site |
| Kill switch | Operator plan (coming soon) | Not stated on its site |
| Paper trading | Signals are logged with dry-run P&L tracking | Not stated on its site |
| Venues | Polymarket + Kalshi | Polymarket + Kalshi + Opinion |
| Free tier | No (paid from $29/mo) | Not shown on its pricing page |
| Starting price | $29/mo | $59/mo (sports arbitrage); Cross Markets Arbitrage from $149/mo (Pro) |
| API access | Coming soon | Yes (Premium plan, $299/mo) |
ArbBets is an arbitrage scanner for prediction markets. It monitors Polymarket, Kalshi, and Opinion, scanning markets every second and surfacing 100+ daily arbitrage opportunities.
The key distinction: ArbBets presents itself as a finder of opportunities, with an API on its Premium plan for traders who want to build their own automated bots. In the app you place orders on each platform yourself.
ArbBets sells three monthly plans: Basic at $59 (sports arbitrage, educational resources, email support), Pro at $149 (adds Cross Markets Arbitrage, funding-rate arbitrage, an odds screener, a weather edge finder and a sharp-money scanner) and Premium at $299 (adds the API, market making and early access to new features). It also provides an arbitrage calculator and educational blog content.
Source: https://getarbitragebets.com
Arbitrage Agent monitors thousands of binary event markets across Polymarket and Kalshi continuously. AI-powered semantic matching — every pair validated before it goes live — links identical events across platforms — even when titles differ completely.
When a price gap creates an arbitrage opportunity, the opportunity appears in your live feed with both legs ready to place. Automated parallel execution (with a circuit breaker that auto-unwinds if one leg fails) is in final testing and rolls out to Operator subscribers first. The agent is fully non-custodial — your capital stays on Kalshi and Polymarket at all times.
Difference 1
The biggest difference. ArbBets shows you opportunities; Arbitrage Agent shows them with the exact orders to place on each platform. Prediction market spreads can close quickly, and placing orders on two platforms by hand takes time. Automated parallel execution, in final testing and rolling out to Operator subscribers first, is aimed at capturing spreads that manual trading cannot.
Difference 2
Arbitrage Agent matches markets across Kalshi and Polymarket using AI matching plus a check of the resolution rules on both sides. ArbBets states 990+ matched pairs on its site; we have not verified either catalogue's size against the other, so compare the markets you actually trade.
Difference 3
Arbitrage Agent's Operator plan (coming soon) is planned to add Kelly sizing and risk caps, and its automated execution, still in testing, is planned to add a circuit breaker and kill switch. On Starter, risk management is up to you. We have not found risk controls described on ArbBets' homepage; check its pricing page.
Difference 4
ArbBets' $59/month Basic plan covers sports arbitrage; the Cross Markets Arbitrage feature, the closest to what Arbitrage Agent does, is listed from the Pro plan at $149/month. Arbitrage Agent Starter is $29/month and includes step-by-step guides for both legs; it does not place orders for you.
When to choose ArbBets
When to choose Arbitrage Agent
ArbBets and Arbitrage Agent overlap on Kalshi–Polymarket arbitrage but differ in scope and price. ArbBets covers more venues and products and offers an API; Arbitrage Agent Starter is a lower-priced signal feed with guides and resolution-rule checks, and does not place orders. Choose by the venues you trade, whether you want an API, and budget. Check ArbBets' pricing page for current plans.
Does ArbBets execute trades automatically?
ArbBets describes itself as an arbitrage finder and offers an API for automated trading on its Premium plan; check its site for what the app itself does. Arbitrage Agent Starter does not place orders: it shows both legs and you place them yourself.
Which tool monitors more markets?
ArbBets states 990+ matched pairs across Polymarket, Kalshi and Opinion. We have not compared the two catalogues directly, so check the markets you trade.
Is ArbBets cheaper than Arbitrage Agent?
No. ArbBets' Basic plan is $59/month and covers sports arbitrage; its Cross Markets Arbitrage feature is listed in the Pro plan at $149/month. Arbitrage Agent starts at $29/month.
Can I use both tools together?
You could use ArbBets' scanner to manually verify opportunities while using Arbitrage Agent's guides to place the orders. However, Arbitrage Agent already includes its own opportunity scanner with broader coverage.
See the live arbitrage feed
Both legs ready to place, with a step-by-step guide. You trade on your own accounts. No coding required.
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