A Kalshi combo raises three different questions: how do I build it, is the price fair, and what do I do once legs start hitting? No single tool owns all three, so here's who does what. Every competitor cell below was read from that company's own site on Nov. 6, 2026, and a dash means we could not verify it, not that the feature is missing.
| Combo Edge Builder | Kalshi Combos | ContractTax | |
|---|---|---|---|
| Where the trade happens | No, it's a calculator | Yes | No |
| Correlation-aware fair price | Yes, modeled for NFL same-game legs | Priced into the market maker's quote | Warns about correlated legs in its guide; a modeled price not verified |
| Fee-inclusive check | Yes | β | Yes, its Parlay Builder computes fees |
| Sizing | Kelly, through the Kelly calculator | β | Kelly, through its trade analyzer |
| Live hedge | No | β | Yes, advertised as "the exact hedge" |
| Slip screenshot import | No | β | β |
| Cost | Fully free | Part of Kalshi | Free calculators, with a paid product |
Sources: ContractTax's parlay guide, its trade page and its trade analyzer.
Where each combo tool fits
Kalshi Combos is the venue. You pick the legs, ask for a quote and fill it there. If you want the rules, how Kalshi combos work covers them, and the combos hub links the rest.
Combo Edge Builder answers one question: does this quote clear fair value? It's built around correlation, because a same-game combo's legs move together and the simple product of their prices misses that. For independent legs, the Kalshi parlay calculator is the quicker check.
ContractTax covers more of the life of a position. Its trade page says it grades a Kalshi parlay, shows which leg is dragging it down and gives the hedge once legs start hitting. If that's the job you need done, it's the one of these three that advertises it.
Paste any venue's quote
The fair-value math doesn't care who quoted you. Paste a Kalshi combo quote, or a same-game price from anywhere else, and see whether it clears the fair band.
A worked example with made-up inputs: two legs at 68Β’ and 58Β’, a 44% chance both hit, and a +180 quote. combo_edge returns a fair price of +127, a fair band of +114 to +142, and +23.2% expected value at the quote. Add the venue and it puts that venue's fee on the quote, so the same check holds for Kalshi, Polymarket US or Novig. That's a fee calculation, not a claim that every venue lists combos.
What Combo Edge Builder doesn't do
We don't have a live hedge calculator or a slip screenshot import. If those are the jobs you came for, this isn't the tool yet.
Trade responsibly.