Listed on both venues
Juan Manuel Cerundolo wins — Juan Manuel Cerundolo
The same question, listed on two exchanges that each set their own price.
Kalshi
Juan Manuel Cerundolo wins — Juan Manuel Cerundolo
Polymarket US
Who will win in the upcoming atp event Mariano Navone vs Juan Manuel Cerundolo scheduled for October 18, 2026 at 8:00 AM UTC?
Which side pays more, after fees?
A price difference between two venues is not an edge. Each exchange charges its own fee — a curve, not a percentage — the quoted price only holds for the first contract, and the two markets have to settle the same way or you lose both legs. ArbScout walks both order books to your size, applies each venue's real fee schedule, and grades how confidently the two can be called the same contract.
See the price on both sides
Net edge after fees, how much size the books can absorb, and a confidence grade on whether these two really are the same contract.