Combo Edge Builder
Build same-game combos on Kalshi and grade them against their true joint probability. Kalshi can't price correlation — this finds where assembling correlated legs is structurally underpriced.
Quick Answer
this builder prices Kalshi same-game combos against their true joint probability. Kalshi has no SGP product, so it prices every leg standalone with zero correlation adjustment — when same-game legs move together, assembling them is structurally underpriced, and the tool surfaces that edge with a Win%, correlation bonus, fair-vs-offered odds, EV and a SMASH/FAIR/NO PLAY verdict.
What is the Kalshi Combo Edge Builder?
It is a correlation-aware same-game combo (SGC) builder for Kalshi — the equivalent of a same game parlay tool, but built for an exchange that has no parlay product. You pick legs from the live board, stack them into a slip, and the builder shows what the combo should pay (fair odds), what buying the legs on Kalshi pays right now (offered odds), the correlation bonus, the expected value, and a verdict.
How to use it
Sort the board by edge, add two or more same-game legs to the slip, and read the correlation bonus and EV. Same-game legs are where the value lives — cross-game legs are independent and carry no bonus. Size any position you take with the built-in quarter-Kelly suggestion, and pair it with the EV Calculator and free Combo Builder.
Related Tools
How the Combo Edge Builder works
For every live World Cup match, the builder reads our scoreline model — a per-match joint distribution over every possible final score, built from an expected-goals (Poisson) model with a Dixon-Coles low-score correction. Every leg you can pick (match result, Over/Under 2.5, Both Teams To Score) is just a condition on that scoreline, so the leg probabilities and the combo probability all come from the same distribution and never contradict each other.
When you stack legs from the same match, the builder sums the probability of every scoreline where all of your legs hit at once — the exact, correlation-aware joint probability. It compares that to the naive product of the leg probabilities (what a no-correlation tool would show) and reports the difference as the correlation bonus.
Why Kalshi can't price this
Kalshi has no Same Game Parlay product. You build a combo by buying each contract on its own, at its own standalone price, with no correlation adjustment of any kind. For positively-correlated same-game legs, multiplying those standalone prices understates how often both actually hit — so the assemble price is structurally too long, and the builder flags the gap as the correlation edge. Negative-correlation pairs are the trap: they look cheap to assemble but the true joint is lower, so they are marked in red.
Frequently Asked Questions
Can you do a same game parlay on Kalshi?
Not as a single product — Kalshi has no Same Game Parlay (SGP) builder. You assemble a combo by buying each contract separately, and each one is priced as its own standalone market. The practical upshot is the whole point of this tool: because Kalshi prices each leg independently, it applies zero correlation adjustment. When two same-game legs move together (for example "Home win" and "Over 2.5 goals" for a strong favorite), the cost of buying both (price one × price two) is structurally cheaper than their true joint probability. This builder computes that true joint probability from a scoreline model and shows you the gap.
Why are correlated Kalshi combos +EV?
A same-game parlay product is normally priced with a correlation adjustment — the operator shortens the payout because it knows that if the favorite wins, the over is more likely too, so it will not pay full odds on both. Kalshi cannot do that: there is no parlay product, so each leg trades at its own standalone price. When legs are positively correlated, multiplying the two standalone prices understates how often both actually hit together. That gap between the assemble price and the true joint probability is the edge, and it is systematic rather than occasional because the exchange has no mechanism to price correlation at all.
What is a correlation bonus?
The correlation bonus is how much more likely your combo is to hit than a naive multiply of the individual leg probabilities would suggest. We compute the true joint probability from a per-match scoreline grid (an exact Poisson + Dixon-Coles distribution over every possible scoreline) and compare it to the product of the marginals. If the joint probability is 33% but multiplying the legs gives 26%, the correlation bonus is about +27%. Cross-game legs are independent, so their bonus is zero — the bonus only appears on same-game legs, which is exactly where the Kalshi mispricing lives.
What does the SMASH / FAIR / NO PLAY verdict mean?
The verdict reads the expected value of assembling the combo at the current Kalshi prices against its true joint probability. SMASH means the offered (assemble) odds are meaningfully longer than fair — better than +5% EV. FAIR means it is within a few points of fair value either way. NO PLAY means the assemble price is worse than fair, below -5% EV. A negative-correlation trap is flagged separately in red: that is when the legs fight each other (like a home win plus both teams to score), so the true joint is below the naive product and the combo only looks cheap.
Which World Cup legs can I combine?
For each live match the builder offers the match result (home win, draw, away win), Over 2.5 goals, and Both Teams To Score — every one priced off the same scoreline model so the per-leg numbers and the combo number never disagree. You can stack legs within a single match (same-game, where the correlation bonus applies) or across different matches (treated as independent). Free accounts build 2-leg combos; Picks Pro unlocks up to 6 legs plus fair-vs-offered odds, the correlation edge, the verdict, and Kelly sizing.
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