Premarket
Arbitrage and odds
Premarket focuses on comparing prices and potential cross-market opportunities.
- Polymarket
- Opinion
Prediction market arbitrage and odds comparison
Scanners that compare prices for the same event across prediction markets and sportsbooks. 27 listed.
2 listings that name Opinion, fullest profiles first
Website checked 31 Oct 2026
ArbBets
Arbitrage and odds
Scanner that flags YES/NO price gaps across Polymarket, Kalshi and Opinion (990+ matched pairs), with alerts and a REST API on higher tiers. Does not place trades.
Website did not answer at the last check
- Paid or fee-based
- Polymarket
- Kalshi
- Opinion
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