If you have looked up Kalshi gas prices, what you have most likely found is one of several contracts, with the national monthly market as the flagship, and every one of them pays out based on one number from one organization most Americans know for towing cars. Every Kalshi market lives or dies on this principle: the contract settles on the referee's number, not your number, and the rules name the referee in advance. In the gas markets, that referee is AAA. Not the government's energy agency, not a price-tracking app, and definitely not the sign at the station down the road.
That sounds simple, and mechanically it is. But the resolution rule contains a handful of words that quietly decide who gets paid, and traders who skim past them are pricing a different contract than the one they bought. By the end of this piece you will know exactly which words those are, and why one of them turns an exact tie into a loss.
The Quick Answer
Kalshi gas price markets settle against AAA's national average price for a gallon of regular gasoline, measured on the last day of the month: if that average is strictly greater than the market's strike, the market resolves Yes, and an exact match on the strike resolves No. It is a monthly series with a publicly visible input, which makes it one of the most watchable settlement processes on the exchange. The full rule, the referee behind it, and the two traps in the wording are all below.
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The Rule, Verbatim
A gas price prediction market is only as good as its referee, so start where the money starts. Here is the resolution rule from one of the national monthly markets, ticker KXAAAGASM-26AUG31-5.00 (the $5.00 rung of the August 2026 US gas price series), exactly as the rulebook states it:
"If average regular gas prices for United States are strictly greater than $5.00 on Aug 31, 2026 according to AAA, then the market resolves to Yes."
One sentence, and every phrase in it is doing work. "Average regular" names the grade and the aggregation. "For United States" names the geography. "Strictly greater than" sets the inequality. The date names the measurement day, which for this series is the last day of the month. And "according to AAA" names the Source Agency, the single authority whose number grades the contract.
Readers of our explainer on how prediction markets work will know the structure already: yes/no contracts that settle to $1 or $0, with the price in cents readable as a probability. What makes each market family distinct is only ever the referee and the clock. So let's meet this one's referee.
Who AAA Is (And Who It Is Not)
AAA is the American Automobile Association, the federation of motor clubs best known for roadside assistance and travel maps. It is also, less famously, the publisher of a daily national average price for a gallon of gasoline, compiled from station-level price data across the country and posted publicly on AAA's own gas prices site. AAA is the only settlement source the series rulebook names. That daily national average for regular grade is the settlement number.
The distinction matters because AAA is not the only organization that publishes a US gas price, and none of the others settles this contract:
- The EIA (the US Energy Information Administration) runs its own retail gasoline price survey, published weekly. It is a government statistic, it is widely quoted, and it is irrelevant to this contract.
- GasBuddy aggregates crowd-reported prices from its app. Useful for finding a cheap fill-up, irrelevant to settlement.
- The Sign Down The Road is one station, one day, one town. It is an anecdote, not the average.
These sources can disagree by meaningful amounts on the same day, because they measure different station sets on different schedules with different methods. The phrase I keep coming back to is "according to AAA," because it dissolves every argument in advance: when the measurement day arrives, exactly one number grades the market, and the rules told you months earlier whose it would be. If you think a settlement was graded against the wrong figure, there is a formal process for that, which we cover in what happens when a Kalshi market is disputed. But "my app said something different" is not a dispute. It is a different referee.
"Strictly Greater Than": A Worked Example At The Strike
The second load-bearing phrase is the inequality. "Strictly greater than" means the Yes side needs the settlement number to clear the strike, not touch it. Here is how three possible AAA prints grade against the $5.00 strike in the rule quoted above:
| AAA National Average On The Measurement Day | Is it strictly greater than $5.00? | Market resolves |
|---|---|---|
| $5.01 | Yes | Yes |
| $5.00 Exactly | No | No |
| $4.99 | No | No |
How the strict inequality grades three possible settlement prints against the $5.00 strike of KXAAAGASM-26AUG31-5.00, the market rule quoted above.
The middle row is the one that costs people money. A print that lands exactly on the strike feels like a push, and a sportsbook would grade it as one and refund the bet. An event contract has no push. Every market resolves Yes or No, so the boundary case has to belong to one side, and in this wording it belongs to No. A Yes holder who watched the average climb all month to land precisely on the number did not almost win. They lost, at full contract value, by zero cents.
That is not a quirk of this one gas contract. It is how every contract written with a "strictly greater than" threshold grades, and it is why reading the inequality is as important as reading the strike.
One Grade, One Country
The third phrase, "average regular gas prices for United States," defines what is actually being averaged, and it excludes more than it includes.
One grade. The number is for regular gasoline. Midgrade, premium, and diesel all have their own AAA averages, and all of them are typically well above regular. Drivers whose cars take premium are paying a number that is not even the right grade, let alone the right geography.
One country. The number is a national average, and a national average is a number almost nobody actually pays. A state or a city can sit a dollar away from the figure that settles the contract, and California routinely is: its state average runs far above the national number as a matter of course, thanks to taxes, fuel formulation requirements, and refining logistics. A trader in Los Angeles who prices the national contract off their own windshield view is systematically wrong in one direction, every month.
This is the same lesson our weather markets hub teaches with thermometers: temperature contracts settle on one named station, not "the city," and the traders who lose are the ones grading the market against their own backyard. The gas version of the settlement-station trap is grading a national average against your local pump.
A Monthly Clock With A Public Input
The national series in the rule above is monthly. Kalshi lists it at a monthly frequency, and each market measures AAA's number on the last day of its month. Cadence is the second thing to check after the referee, because Kalshi runs the same AAA national average at several clock speeds: alongside the monthly series (KXAAAGASM) there are daily, weekly and yearly-high/low national gas series, each with its own ticker, and every one of them names AAA as the source. Same referee, four different questions. Confirm which clock your ticker is on before you price anything.
Compare it to the two clocks we have covered elsewhere in this cluster. Kalshi's economic data markets settle on embargoed releases: nothing is knowable until a scheduled instant, and then everything is. Daily weather markets drift toward their answer over hours as observations arrive. The gas markets are a third animal: the settlement input is published every single day, in public, for the entire life of the contract. Anyone can watch AAA's national average walk toward or away from the strike all month long. One catch the rulebook does not shout: trading on the August 2026 market closes at 11:59 PM ET on August 30, and AAA's settling print for August 31 does not land until the next morning. You can watch the number all month, but you cannot trade the market on the day it is measured, so a last-day entry off the final print is not a trade the exchange will accept.
That transparency has a consequence worth understanding before you trade: a slow-moving, publicly visible average rarely produces a settlement shock. By the final week of the month, the market usually knows roughly where the number is going to land, because the number itself is telling everyone daily, and prices converge accordingly. The uncertainty that remains near month-end lives almost entirely in the strikes close to the current average. Which is exactly where the boundary row of that table above, the exact-tie-loses row, stops being a curiosity and becomes the whole trade. Late entries near the strike are also where Kalshi's per-contract fees matter most, since the fee is largest in absolute terms when a contract trades near 50 cents.
The State And Yearly Series Are Different Instruments
Kalshi does not list just one gas price series. Alongside the national monthly markets there are state-level series, and yearly high/low series such as markets on the lowest gas price of the year in Florida or New York. They look similar on a category page. They are not interchangeable.
A Florida series settles on AAA's Florida average, not the national one. A yearly-low series asks whether the average ever dips below a level at any point in the year, which is a completely different question from where the number sits on one measurement day. Every one of these has its own rulebook naming its own geography, its own window, and its own inequality, and the same referee: the national yearly high and low series (KXAAAGASMAX and KXAAAGASMIN) and the state series such as Florida's yearly low (KXAAAGASMINFL) all list AAA as their settlement source, just the relevant AAA series rather than the national daily number. The referee is constant across the gasoline board; the question is not. One instrument asks where the national average sits on one date, another asks whether a state average ever crosses a line at any point in a year. The ticker and the rules page tell you which instrument you are holding; the category page does not. Treating a state series as the national one, or a yearly-range market as a month-end snapshot, is an unforced error that the rules were written to prevent.
The Risk Shape Never Changes
However well you read the rules, the payoff arithmetic of selling long shots is the same here as everywhere else on the exchange. Selling an unlikely outcome collects a small premium and risks most of a dollar. Sell a tail at 8 cents and you collect 8 cents against 92 cents of risk, so one loss erases the premiums from about 11 wins; sell it at 3 cents and it takes about 32. That arithmetic — not the hit rate — is what makes position sizing the whole game, and it means a red day that wipes out a green stretch is the shape of the strategy working as designed, not a malfunction.
The gas series adds its own flavor of this trap. Because the input is public and slow, deep out-of-the-money strikes look free almost all month, and selling them feels like collecting rent on a foregone conclusion. The months that break that pattern (a hurricane hitting refining capacity, a sudden crude spike) are precisely the months when every seller of the same tail loses together. Whether market prices in general earn their confident look is a question we take up in whether prediction markets are actually accurate; the sizing math is what protects you while the sample builds.
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No Forecast Here
We are not predicting gas prices. Nothing on this page is a pick, a lean, or a recommendation, and that is a standing rule across our prediction-market coverage: we publish how the market works, never a position to copy. Stokastic trades event markets and holds positions in them, which is exactly why the line matters. If you want probability-first analysis in markets where our analysts do publish selections, the free expert picks page is the honest version of that, in sports markets we actually cover.
What we hope you take instead of a forecast is the reading discipline, and it travels well beyond the gas board. A sportsbook price is the same object as a Kalshi contract: a probability with a toll attached. A standard -110 line at DraftKings or FanDuel carries the book's margin inside the odds, and stripping it out, de-vigging the market into a no-vig fair price, is the same find-the-real-number habit this whole article has been teaching. That is the job OddsShopper's odds screen and EV Calculator do in the sports markets we cover: line shopping a price across every major sportsbook available in your state, de-vigging it into a fair number, and surfacing the prices that beat it. Gas contracts are not on that screen, and we will not pretend they are. The discipline transfers; the coverage does not. If you want to see the sports version of the find-the-real-number habit in action, OddsShopper Pro comes with a free week trial for new subscribers, so you can run the odds screen and the EV Calculator on a real slate before paying a dollar, and code KALSHIGAS20 takes 20% off your first OS Pro payment if you stay past the week.
So hold the three things the rulebook actually cares about. One referee: AAA's national average for regular, and no other number on earth. One inequality: strictly greater than, where the tie goes to No. One clock: monthly, measured on the last day, with the input published daily in plain sight. Hold those, and the sign down the road becomes what it always was, an anecdote about one station, while the contract quietly settles on the only number the rules ever named.
