Graph below is taker volume (NOT notional volume) for recent midweek NFL games at Kalshi/Poly (US + defi). Not a huge gap!
A lot of the gap we are seeing between Kalshi and Poly/the field at the top line for sports is increasingly from combos.
New: Polymarket's US platform (still in closed beta) is catching up to Kalshi. On the market for The Masters winner, Poly US did $255 million in volume, a little more than half of Kalshi volume for the same market ($460M).
(Numbers don't include Polymarket's DeFi platform)