Why a parlay costs more

All four US venues now sell some form of parlay. Kalshi, Polymarket and Robinhood call them combos; Novig calls them parlays. Each prices the combination as one thin market, and each charges more for it than for a single.

Combo cost, leg by leg

NOVIG 0.10

LEGS AT 62¢ EACH

−

Combined chance23.8%

Fair payout on $50$209.79

Fee at the 0.10 tier−$3.81

Kept of the win98%

Illustrative at a flat 62¢ per leg, with Novig's parlay coefficient applied to the combined price. Each venue's own page uses its own formula.

THE RULES, SOURCED

Robinhood offers preset combos and custom combos of up to 10 legs, filled whole or not at all robinhood.com ↗. Kalshi prices combos by request for quote help.kalshi.com ↗, Polymarket US publishes a combo formula of its own docs.polymarket.us ↗, and Novig adds a 0.10 coefficient support.novig.us ↗.

VENUESINGLECOMBO

Novig0.03 live0.10

Kalshi0.07 taker+ HALF MAKER

Polymarket0.03 to 0.072 TO 10 LEGS (US)

MPU · 300×250

Can you parlay on Kalshi?

Parlays on Novig

Parlays on Polymarket

Every venue compared