The execution math, done for you.

Free calculators built on the venues' published fee schedules. The same math runs inside Mithril's router on every order.

Kalshi fee calculator

The taker-fee formula, total cost, and effective per-contract price for any order size and price.

No exchange fee doesn't mean no cost — notional, gas, and effective per-share price.

Fee-adjusted net price of the same market on both venues, and the real edge in bps.