Kalshi Rotten Tomatoes markets let you trade yes/no contracts on whether a film's Tomatometer score will sit above a given number at one exact moment: 10:00 AM ET on the Monday after the film's wide release. That last clause is the entire game, and it is the part almost everyone misses. The Tomatometer is a living number. Reviews keep landing after that Monday snapshot, the score keeps moving, and the figure on your phone a day later is routinely not the figure the contract settled on. Anyone who has read our piece on the settlement station trap in weather markets already knows this shape: the market does not grade on the thing everyone casually looks at. It grades on one precisely defined reading, and the fine print is the instrument.
The cleanest case of that I have seen ran on the exchange this August. The End of Oak Street went into wide release on Friday, August 14. By that weekend its Tomatometer was sitting on exactly 85, and its "Above 85" contract was set to determine on Monday, August 17 at 10:00 AM ET. Hold those two numbers next to each other, because the gap between them is not a rounding detail. It is the whole contract, and I will show you what the market is charging for it further down.
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The Quick Answer
Kalshi's Rotten Tomatoes markets are event contracts on a film's Tomatometer score, settled against a single snapshot of the score taken the Monday after wide release at 10:00 AM ET — not against whatever the score says when you happen to check. "Above" is strict, so a score that lands exactly on the strike loses. Below: how the contract ladder is built, the exact rules language on the snapshot and the tie, and the live End of Oak Street ladder, whose prices imply an exact 85 was the market's central risk hours before settlement.
How A Tomatometer Contract Is Structured
Readers who know how prediction market contracts work generally will find the Rotten Tomatoes family familiar. Each film gets a series of markets, and each market in the series asks one yes/no question: will this film's Tomatometer score be above a specific strike value? Each strike trades as its own contract. Every contract settles at $1 if the answer is Yes and $0 if the answer is No, and you can take either side.
Because settlement is binary, the price reads as a probability: a Yes trading at 70 cents is the market saying roughly a 70% chance the score clears that strike. (If cents-to-odds conversion is new to you, our Kalshi odds explainer walks through it, and what the price means covers why that probability reading has caveats.) The caveats bite harder here than in most families, because the underlying number is unusually jumpy: early in a film's release the counted review pool is small, so a handful of fresh reviews can swing the Tomatometer several points in an afternoon, and the strike ladder reprices with it. Reading the whole ladder, not one strike in isolation, tells you the market's full distribution for the score, the same way a city's temperature bands do in our weather coverage.
The End of Oak Street shows the scale this family can reach. Its board carries 21 separate strikes, from Above 45 all the way up to Above 95, and roughly 823,000 contracts have changed hands across them, with about 407,000 contracts still held open going into settlement morning. Liquidity varies enormously film to film, and most titles never get near that. But this is not an empty corner of the exchange.
None of that structure is the trap. The trap is in when and how the question gets answered.
Settlement Is A Timestamp, Not A Score
Here is the rules text from a real, currently open market in the series (ticker KXRT-END-85), verbatim:
"If The End of Oak Street has a Tomatometer score of above 85 on Aug 17, 2026 at 10:00 AM ET, then the market resolves to Yes."
Read that date-and-time clause again, because it does the work. The specific date in the quote is simply that film's settlement Monday; every market in the family carries its own. The contract does not ask what the film's score "is" in any general sense. It asks what the score is at one timestamp, and the family's standard determination window pins that timestamp down:
"The market will be determined the Monday after wide release at 10:00 AM ET."
The Tomatometer, meanwhile, does not stop. It is a running percentage of critics' reviews counted as positive, and it recalculates as every new review lands — the same small-review-pool jumpiness that whips the strike ladder around before release is still in force on settlement morning. Scores drift through opening weekend and keep drifting after. A film can settle its "Above 80" market as Yes on Monday morning and sit at 78 by Wednesday, and both numbers are real. Only one of them ever mattered to the contract.
This is the exact analogue of the weather settlement station trap. In weather, the market grades on one named station's official reading, not the temperature your app shows for the city. Here, the market grades on one moment's Tomatometer reading, not the score your phone shows the next day. In both cases the losing trader was often not wrong about the underlying thing (the movie's reception, the city's heat). They were wrong about the instrument. If you check the score Tuesday and it disagrees with how your contract settled, the market is not broken, and this is not what Kalshi's settlement dispute process exists for. The snapshot is the contract.
"Above" Is Strict: A Tie Loses
The second clause worth reading twice is the inequality. From the rules secondary, verbatim:
"The Tomatometer score must be above the strike value to resolve as YES (for example, a score of 75 would resolve "Above 75" as No.)"
Above means strictly above. A score that lands exactly on the strike resolves the market No. Kalshi's own example makes it concrete: at the determination timestamp, a Tomatometer reading of 75 settles "Above 75" as No, even though a casual reader would call that "hitting 75." There is no push, no refund, no half-payout. On a strike ladder this matters most at the round numbers where scores actually cluster and where strikes are deliberately placed. The difference between 85 and 86 at 10:00 AM Monday is the difference between $0 and $1 on the "Above 85" contract.
So a Yes holder needs two things, not one: the score has to clear the strike, and it has to be clear of it at the timestamp. A film drifting downward toward a strike into Monday morning is a live risk to a Yes even while it is still "above" on Sunday night.
The Number Is Still Moving, But Not Freely
Here is where the counted review pool stops being a footnote and starts driving the price. On the Friday it opened, The End of Oak Street sat at 85% on 185 counted reviews. By Sunday afternoon it read 85% on 220. The critics' number did not budge across 35 new reviews — but the audience Popcornmeter moved from 71% to 77% over the same stretch, which tells you reactions were still arriving. The Tomatometer simply got harder to move as its denominator grew.
Run the arithmetic and the asymmetry jumps out. At 85% on 220 reviews, roughly 187 of them are counted fresh (the displayed 85% is rounded, so the true count is 187 give or take one). From there, a couple of rotten notices and nothing else is enough to round the displayed number down to 84. Climbing to 86 takes a sustained run of fresh ones, on the order of eight straight with no rotten mixed in. Down is a short step; up is a staircase.
That asymmetry is not a clever observation on my part. The market is broadly priced that way already, and the shape reads straight off the ladder.
The Live Ladder: One Film, One Snapshot, One Morning
Ladder as of the afternoon of Sunday, August 16, 2026, the day before this market determined. The prices below are a pre-settlement snapshot, kept here as a worked example of the rules in motion.
To see all three rules interact, here are the five rows that matter on a 21-strike board, as of the afternoon of Sunday, August 16, 2026, roughly 18 hours before settlement, with the Tomatometer reading 85:
| Contract | Last traded | What it needs at 10:00 AM ET Monday |
|---|---|---|
| Above 80 | 99¢ | Score of 81 or better |
| Above 83 | 99¢ | Score of 84 or better |
| Above 84 | 96¢ | Score of 85 or better, which is already true |
| Above 85 | 31¢ | Score of 86 or better; a reading of 85 settles this No |
| Above 86 | 1¢ | Score of 87 or better |
The row that matters is the bolded one, and it is the cleanest illustration of this article I have found. Above 84 trades at 96 cents because the score only has to stay where it already is. Above 85 trades at 31 cents because it needs the score to actually go up a point, and the review math above says up is the hard direction. The market is not confused about the film's reception at all. Both prices agree the number is very likely to still be 85. They disagree only about whether 85 clears a strike of 85, and the rules say it does not.
Difference the two strikes and the market's actual view falls out: 96 cents minus 31 cents puts a roughly 65% implied chance on the Tomatometer reading exactly 85 at the snapshot. Work it off the quotes instead of the last prints and you get a band of about 60% to 67% depending on which side of each spread you take. Either way the conclusion holds, and it is the striking one: the single likeliest outcome on this board was the tie itself. That is the whole reason a rules clause most readers skim past is, on this particular board, the dominant scenario rather than an edge case.
That contract has whipsawed accordingly. It opened the day at 5 cents, traded as high as 64 and as low as 4, and last printed at 31. None of that is the market changing its mind about whether the movie is good. It is traders repricing the tie itself as reviews trickle in against a denominator of 220, with the clock running out.
Worth folding into any price you pay: Kalshi also charges trading fees that scale with how close the price is to 50 cents, and this strike traded between 4¢ and 64¢ that day before last printing at 31¢, so it moved in and out of the fee-heavy zone around 50 cents repeatedly.
The "Fresh" Badge Settles Nothing
Rotten Tomatoes decorates scores with labels: the red tomato "Fresh!" at 60% and up, the "Certified Fresh!" badge for films that meet its extra criteria. The rules secondary addresses these directly: the labels are "for illustrative purposes only" and carry no settlement meaning. A market never resolves because a film gained or lost a badge.
The End of Oak Street carried the Certified Fresh badge through that whole weekend, and it was worth precisely nothing to every contract listed above. The same goes for its 77% audience score. The Popcornmeter is a different number measuring different people, and no contract in the family reads it. Settlement compares one number, the Tomatometer, to the strike, and stops there. If you find yourself reasoning about a contract in terms of whether a film "goes Certified Fresh" or how audiences are responding, you have left the terms of the instrument. Translate the thought back into a number, a strike, and the Monday timestamp, or leave the trade alone.
One Point Apart Is Not One Point Riskier
The risk shape in this family has a feature worth isolating, because it is not obvious and it is where the money actually moves. The settling number is an integer compared against an integer strike, so the outcomes nearest the money are not a smooth distribution. They are a step. A strike one point away from the current score is not slightly less likely to pay than one sitting at the score; it is a categorically different bet. That is the entire distance between 96 cents and 31 cents on two adjacent rows of the board above, on the same film, on the same morning, with everyone agreeing about the movie.
The generic warning still applies underneath it: these are CFTC-regulated event derivatives, and selling an unlikely outcome collects a small premium while risking most of a dollar, so at a nickel one loss erases the premiums from about 19 wins. Position sizing, not hit rate, is the game. But the step function is the part specific to Tomatometer contracts, and it is the reason a strike ladder here can look mispriced to someone reading it as though a point of score were a point of probability. A red day that wipes out a green stretch is what that shape looks like in practice, which is why copying anyone's style of trade without understanding the arithmetic is the failure mode we care most about.
We say that from experience rather than theory: Stokastic trades Kalshi markets and holds positions in them. Our own live trading log sits on the Kalshi weather markets hub, and its shape is the honest version: short, currently negative, and far too small to confirm an edge or rule one out. We do not publish performance figures on permanent pages like this one, and nothing in this article is a prediction of The End of Oak Street's final score or a recommendation to trade it or any other film. The prices above are reported to show you how the rules bite, not to point you at a side. This is a mechanics page.
Read The Snapshot, Not The Site
Zoom back out and the whole article is three sentences of fine print. A Tomatometer contract settles on a snapshot taken the Monday after wide release at 10:00 AM ET; above means strictly above, so a tie loses; and the Fresh badges are decoration. At 10:00 AM ET on Monday, August 17, one of those sentences decided that entire board. Whoever it cost did not misjudge a dinosaur movie. They read the score correctly, at 85, and still lost the strike, because 85 is not above 85.
The habit that protects you there is narrow and portable: before you look at a price, find out exactly what number settles it. That is the same discipline line shopping runs on. DraftKings and FanDuel post two different prices on the same game, and a price only turns into information once you know what it resolves against and strip the book's hold out of it — which is why an odds screen that puts every major sportsbook's number side by side is a reading tool before it is a shopping tool. A Tomatometer contract is the purest version of the same lesson, because there the settling number and the number on the website are visibly two different things. If you want to watch that read applied daily, our free expert picks show the working.
FAQ: Kalshi Rotten Tomatoes Markets
How do Kalshi Rotten Tomatoes markets settle? Each contract asks whether a film's Tomatometer score is above a strike value at a single timestamp — the Monday after the film's wide release at 10:00 AM ET. The score at that moment decides every contract in the film's series at $1 or $0. Later movement in the score changes nothing.
What happens if the score exactly equals the strike? The market resolves No. The rules require the score to be strictly above the strike, and Kalshi's own example says a score of 75 resolves "Above 75" as No. There are no pushes.
Does "Certified Fresh" affect settlement? No. The rules state the Fresh and Certified Fresh labels are "for illustrative purposes only." Settlement compares the numeric score to the strike and nothing else. The audience Popcornmeter score is likewise irrelevant — only the critics' Tomatometer settles these contracts.
Why is the Tomatometer different from the settled result when I check later? Because the Tomatometer keeps recalculating as reviews land, while the contract froze at the determination timestamp. The number you see later is a different reading of a moving instrument, exactly like checking a different thermometer than the settlement station in a weather market.
Disclosure and fine print. Stokastic trades Kalshi markets and holds positions in them; where a settled position is described in this series, we were the seller. We have no affiliate or commercial relationship with Kalshi. Rotten Tomatoes, Tomatometer and Popcornmeter are marks of their owner; references here are descriptive only, and neither Kalshi's markets nor this article is endorsed by or affiliated with Rotten Tomatoes. Kalshi event contracts are CFTC-regulated derivatives traded on a designated contract market, not sportsbook wagers, and a position can lose its full value. 18+, available where Kalshi operates; the risk of loss is real. This series is an open research log of a strategy we have not proven. Nothing here is trading advice, and nothing on this page is a pick, a score prediction, or a recommendation.
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