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, this summer's dinosaur picture, went into wide release on Friday, August 14. By that weekend its Tomatometer was sitting on exactly 85, and its "Above 85" contract was determined on Monday, August 17 at 10:00 AM ET. Hold those two numbers next to each other, because they are the same number, and on this board the same number pays zero. That collision is the whole contract, and further down I will show you what the market was charging for it, and how settlement morning graded everyone who paid.
Stay ahead of the markets.
Daily insights and expert picks on Kalshi, Polymarket, and what's moving markets.
Free forever. Unsubscribe anytime.
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 settled End of Oak Street board — where the market's prices made an exact 85 the central risk going into the snapshot, the score landed one point higher, and the tie rule still decided a strike.
These are market prices and model estimates, not predictions of fact and not financial advice.
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 showed the scale this family can reach. Its board carried 21 separate strikes, from Above 45 all the way up to Above 95, and by the pre-settlement weekend roughly 823,000 contracts had changed hands across them, with about 407,000 contracts still held open (exchange data pulled Sunday, August 16; Kalshi clears these figures once a market finalizes, so treat them as that weekend's reading). 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
The rules text from a real market in the series (ticker KXRT-END-85, now settled) reads, 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."
That clause is not hidden. Every Kalshi market page carries its rules text, the same strings quoted above, and the exchange's public API returns them word for word, which is where the quotes on this page come from. So the check is mechanical: before touching any film's ladder, open the market's rules, read off the exact settlement date, and notice that the Monday is anchored to wide release. A film that opens limited and goes wide later settles on the Monday after the wide date, not the premiere.
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 — the supplementary rules text Kalshi publishes with each market — 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
The counted review pool stops being a footnote right about here, and starts driving the price. On the Friday it opened, The End of Oak Street sat at 85% on 185 counted reviews. By late weekend it read 85% on 220. Thirty-five new critic reviews landed and the displayed number never moved. The Tomatometer had simply gotten 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.
Here is the part that keeps me honest: the ladder did not buy my staircase. Read the board below and the market had a slip to 84 or lower carrying about 9 cents' worth of probability, and a climb past 85 carrying 42. It rated the staircase several times likelier than the short step. Hold that disagreement, because settlement morning graded it.
The Pre-Settlement Ladder: One Film, One Snapshot, One Morning
Board as of the last trades of Saturday night, August 15, 2026, pulled from Kalshi's public trade tape — about a day and a half 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, at each contract's final Saturday print, with the Tomatometer reading 85:
| Contract | Last traded | What it needed at 10:00 AM ET Monday |
|---|---|---|
| Above 80 | 99¢ | Score of 81 or better |
| Above 83 | 98¢ | Score of 84 or better |
| Above 84 | 91¢ | Score of 85 or better, which was already true |
| Above 85 | 42¢ | Score of 86 or better; a reading of 85 settles this No |
| Above 86 | 3¢ | 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 traded at 91 cents because the score only had to stay where it already was. Above 85 traded at 42 cents because it needed the score to actually go up a point, and the review math above says up is the hard direction. The market was not confused about the film's reception at all. Both prices put the bulk of their weight on the score still sitting at 85, and the rules then decide what a reading of 85 does to each strike: it keeps Above 84 alive and kills Above 85, because 85 is not above 85.
Difference the adjacent strikes and the market's rough view falls out: 91 cents minus 42 cents puts something like a 49% implied chance on the Tomatometer reading exactly 85 at the snapshot, and 42 minus 3 puts about 39% on exactly 86. Treat those as a read off last prints, not a synchronized quote sheet; spreads, fees, and stale prints all blur the arithmetic. The shape survives the blur: the largest single outcome bucket on this board was the tie itself, with the one-point climb right behind it. That is why a rules clause most readers skim past was, on this particular board, the dominant scenario rather than an edge case.
That contract whipsawed accordingly. On Saturday alone it opened at 5 cents, traded as high as 64 and as low as 4, and closed the night at 42. None of that was the market changing its mind about whether the movie is good. It was traders repricing the tie itself as reviews trickled in against a growing denominator, with the clock running out.
Then Sunday answered the staircase question. Fresh reviews kept landing, and the tape caught the climb my arithmetic called hard: Above 85 ran from the mid-40s into the 90s by Sunday night, and Above 86, a Saturday afterthought at 3 cents, traded up to 16. At 10:00 AM ET on Monday, August 17, the snapshot read 86. Above 85 resolved Yes and paid its holders a full dollar. The market's central case, the tie at 85, never happened; the ladder's second scenario did, and the ladder had seen it coming better than my review math had.
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¢ on Saturday alone, 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 wore the red Fresh tomato all weekend — automatic at 85% — and the badge was worth precisely nothing to every contract listed above. The same goes for its 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 moved. 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 91 cents and 42 cents on two adjacent rows of the Saturday board above, on the same film, with everyone agreeing about the movie. And settlement demonstrated the step twice in one morning: the snapshot read 86, so Above 85, the contract carrying all that tie fear, paid a full dollar, while one rung up Above 86 died on the same clause this whole article is about, because 86 is not above 86. Kalshi's rules example used 75; the real board ran it at 86.
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, 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 here is a prediction of any film's score or a recommendation to trade any market. The settled results above are reported from Kalshi's published settlement data, and the prices are reported to show you how the rules bite, not to point you at a side. This is a mechanics page.
More on this: Primetime Rotten Tomatoes Score: The Smashing Machine Problem · Runner Rotten Tomatoes Score: A Dozen Reviews In, The Next One Picks A Side · By Any Means Rotten Tomatoes: Traders Beat The Write-Ups To The Drop · Onslaught Rotten Tomatoes Score: Will It Hold On Kalshi? · Coyote Vs. Acme Rotten Tomatoes: 96 Held. The Margin Was Zero
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, those sentences decided that entire board at a reading of exactly 86. The tie everyone had been pricing at 85 never came, the 42-cent contract paid a dollar, and the trader it actually cost did not misjudge a dinosaur movie. They watched the score climb to 86, the exact number in their Above 86 ticker, and still lost, because 86 is not above 86.
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, and the full OddsShopper Pro toolkit behind them starts with a free week trial, so you can test the habit before paying a dollar.
