The 2026 NFL preseason is supposed to be the quieter part of the football calendar. Starters play limited snaps, coaches experiment with depth charts, and many of the games have little connection to what eventually happens in the standings.

Prediction markets are treating it very differently.

NFL-related trading across Kalshi, Polymarket Global and Polymarket US reached $167.8 million during the week ending August 16, 2026, according to data compiled by DeFi Rate. That represented a 324.4% increase from $39.5 million only one week earlier.

Even more striking, $143.5 million—or 85.5% of the week’s NFL activity—came from preseason game markets rather than futures or regular-season contracts.

Those numbers make the preseason an unexpectedly important test for sports prediction markets.

The surge does not prove that NFL event contracts will sustain this growth once the regular season begins. Nor does trading volume represent the same thing as sportsbook handle or new customer deposits. But it demonstrates that relatively low-stakes exhibition games can already generate substantial exchange activity.

That raises a bigger question ahead of September: if preseason football can produce a fourfold weekly increase, what happens when games begin affecting division races, playoff probabilities and Super Bowl expectations?

NFL Trading Rose From $39.5 Million to $167.8 Million

The speed of the increase stands out.

NFL prediction-market volume totaled approximately $39.55 million during August 3–9. One week later, it reached $167.83 million.

That is a gain of more than $128 million in seven days.

According to DeFi Rate’s NFL prediction-market analysis, cumulative NFL volume across the markets it tracked had reached $236.9 million by August 16. Approximately 71% of that cumulative activity occurred during the latest week alone.

The category breakdown shows what changed.

NFL Prediction-Market Category	Aug. 3–9	Aug. 10–16
Preseason	$24.69 million	$143.51 million
Futures	$12.00 million	$19.56 million
Props	$2.69 million	$4.04 million
Regular season	$162,700	$462,400
Combos	$3,969	$261,800
Total	$39.55 million	$167.83 million

Preseason contracts increased roughly 481% week over week.

Futures grew too, but they were no longer driving the market.

Actual football games had arrived, and trading followed them.

The Preseason Reversed the NFL Market Structure

Only a few weeks earlier, NFL prediction-market activity looked very different.

During July 6–12, futures represented approximately 98.5% of tracked NFL volume. That makes sense. With no games being played, traders interested in football were largely concentrated around questions that could remain open for months.

Those could include eventual championship outcomes, season performance and other long-term events.

The arrival of preseason games reversed that structure.

By August 10–16, preseason contracts represented 85.5% of all NFL volume while futures accounted for only 11.7%. Props represented another 2.4%.

This is an important change because it suggests prediction-market customers are not interested exclusively in long-duration football speculation.

They are also trading individual games—even when those games do not count toward the standings.

That is potentially more consequential for the industry’s long-term sports strategy.

The NFL regular season produces hundreds of individual game opportunities. If users repeatedly trade around weekly matchups, football can create a recurring transaction cycle rather than simply a handful of large futures markets.

One Exhibition Game Generated $19.42 Million

The individual-game numbers make the trend more tangible.

The Carolina Panthers-Arizona Cardinals Hall of Fame Game generated approximately $19.42 million on Kalshi during the reporting window, more than any other preseason matchup tracked in the dataset.

The game took place on August 6 at Tom Benson Hall of Fame Stadium in Canton, Ohio. Carolina defeated Arizona 33–30, with Haynes King scoring on a five-yard run as time expired. The official NFL Hall of Fame Game schedule confirms the matchup and final score.

Other preseason games also attracted significant activity.

Dallas Cowboys-Seattle Seahawks generated approximately $12.97 million, while Los Angeles Rams-Kansas City Chiefs reached roughly $9.88 million in the tracked data.

These are exhibition games.

They do not determine playoff qualification.

They do not alter regular-season records.

And coaches frequently prioritize player evaluation over winning.

Yet traders still committed substantial activity to markets surrounding them.

That makes preseason football a useful experiment for measuring the underlying appetite for NFL event contracts.

Why Would Traders Care So Much About Preseason Football?

The answer is partly structural.

Prediction exchanges need events that can be clearly resolved.

A preseason game provides that.

One team wins, or the contract follows whatever clearly defined settlement conditions were established beforehand.

It also provides continuous information.

Quarterback rotations become clearer.

Rookies receive extended playing time.

Roster competitions develop.

Coaches reveal how they intend to use particular players.

Injuries can change depth charts.

None of this means preseason results reliably predict regular-season performance.

Often they do not.

But a prediction exchange does not require an event to be important to the championship race. It requires enough disagreement and participation to create a functioning market.

The August volume suggests those conditions already exist.

Kalshi Captured Most of the Preseason Activity

The distribution across platforms was highly uneven.

Kalshi generated approximately $113.1 million in preseason volume, representing 78.8% of the tracked preseason total.

Polymarket US accounted for approximately $24.8 million, or 17.3%.

Polymarket Global represented approximately $5.6 million, or 3.9%.

That gives Kalshi a substantial early advantage.

Liquidity can reinforce that advantage because traders often prefer markets where they can enter and exit positions without dramatically moving the price.

A deeper market can attract additional participants.

Those participants add more liquidity.

The resulting network effect can make it difficult for smaller competing venues to catch up unless they provide another compelling reason for customers to move.

That dynamic will become especially important during the regular season. Live Betting Dynamics and Rapid Repricing.

Polymarket US Is Growing Rapidly From a Smaller Base

Kalshi’s lead should not obscure what happened at Polymarket US.

Its preseason activity increased approximately 489.6% week over week, from a substantially smaller base.

Polymarket Global’s preseason activity increased even faster in percentage terms—more than 1,000%—although its starting point was only around $493,000.

Percentage growth can therefore be deceptive.

A small platform can report spectacular growth while still producing a fraction of the absolute activity generated by the market leader.

That is why both growth rate and actual volume matter.

The preseason provides a useful illustration.

Kalshi was not the fastest-growing venue by percentage.

It was still responsible for nearly four out of every five dollars of tracked preseason turnover.

Moneyline-Style Markets Dominated the Early Activity

The composition of preseason trading also offers clues about what NFL users currently prefer.

On Polymarket’s two platforms, game-winner or moneyline-style markets accounted for the majority of preseason activity.

Polymarket Global had approximately 62.6% of its tracked preseason activity in those markets, while the figure for Polymarket US was 68.4%.

Spreads and totals represented smaller shares.

That suggests straightforward game outcomes remain the easiest entry point.

The concept is simple.

Which team wins?

Prediction markets can present that question as two opposing contracts rather than conventional sportsbook odds.

The underlying football decision remains familiar even if the market mechanism changes.

That familiarity may help explain why individual NFL games can attract participation quickly.

The 324% Increase Needs Context

A fourfold weekly increase makes an excellent headline.

It should not be interpreted as a normal growth rate.

The comparison begins from a relatively small base.

During July, there were few NFL games available to trade. Futures dominated because actual football had not started.

Then the preseason arrived.

The product inventory changed abruptly.

A jump from $39.5 million to $167.8 million therefore reflects both increased demand and a major expansion in the number of immediate football events available to the market.

There is another important perspective.

NFL contracts represented only about 1.59% of the $10.58 billion in total activity across the tracked platforms during August 10–16.

Football was growing extraordinarily quickly.

It was not yet dominating the entire prediction-market industry.

Both facts can be true simultaneously.

Prediction-Market Volume Is Not Sportsbook Handle

The $167.8 million figure also needs to be interpreted correctly.

Prediction-market trading volume is not equivalent to sportsbook handle.

A sportsbook wager is generally counted toward handle when a customer places it with the operator.

An event contract can trade repeatedly.

One participant might buy a contract early in the week.

New information arrives.

That participant sells it to another trader.

The second trader later exits to someone else.

Each transaction can contribute to market turnover even though the contracts relate to the same underlying football game.

High trading volume therefore demonstrates activity and can indicate liquidity.

It does not mean $167.8 million of entirely new customer money entered NFL prediction markets that week.

This distinction will become increasingly important as prediction-market totals are compared with conventional sports-betting statistics.

Props Are Starting to Grow Too

Game markets were not the only category accelerating.

NFL props reached approximately $4.04 million during August 10–16.

That was up about 50% from $2.69 million the previous week and more than 100 times the approximately $35,600 recorded during July 6–12.

The absolute number remains small compared with game markets.

The direction is nevertheless worth watching.

Prediction platforms increasingly want to move beyond binary questions about which team wins.

Player statistics and other more granular outcomes can dramatically expand the number of contracts associated with one NFL game.

That expansion creates opportunity and risk.

More markets give users more choice.

They also divide liquidity across more outcomes.

A platform offering hundreds of football contracts needs enough participation to prevent many of them from becoming extremely thin.

The NFL Is Already Asking for Stronger Guardrails

Rapid growth is occurring while the league itself remains cautious about prediction markets.

The NFL submitted comments to the Commodity Futures Trading Commission in July arguing that proposed federal rules still did not sufficiently address sports integrity, consumer protection and manipulation risks.

The league has specifically raised concerns about contracts involving outcomes that could potentially be influenced by one person, as well as injury-related and officiating markets. It has also advocated a minimum age of 21 for sports-event contracts. Front Office Sports reported on the NFL’s requested prediction-market safeguards after the league’s submission to the CFTC.

Those concerns become more important as trading volume rises.

A niche product attracting limited participation presents one level of integrity challenge.

A market handling hundreds of millions or eventually billions of dollars around NFL events creates another.

Growth and oversight will increasingly develop together.

Preseason Football Creates Unusual Information Problems

Preseason games also demonstrate why sports contracts need careful market design.

The incentives are different from regular-season football.

A coach may remove a quarterback after one series.

Another may play starters for an entire quarter.

Teams can prioritize evaluating a specific position group rather than maximizing their probability of winning.

A rookie quarterback might receive extensive snaps while an established starter watches from the sideline.

Those decisions can significantly affect the probability of a game outcome.

Information about playing time can therefore become particularly valuable.

This does not mean preseason markets are inherently improper.

It means users should understand that the information environment is different.

A familiar team name does not imply a familiar competitive situation.

Preseason Results Should Not Be Confused With Regular-Season Strength

The same caution applies to football analysis.

Carolina beating Arizona 33–30 in Canton does not automatically mean the Panthers are stronger than the Cardinals entering the regular season.

Preseason rosters are fluid.

Starters may barely participate.

Players fighting for the final roster positions can account for large portions of the game.

Coaches test schemes they might never use when standings matter.

Prediction markets can still successfully price those games because participants are trading the probability of the specific preseason outcome.

But that price should not automatically be interpreted as a broader forecast of regular-season quality.

The distinction is important for responsible analysis.

The Next Question Is Whether Volume Persists

The 324% increase demonstrates demand.

It does not establish a baseline.

That requires more weeks of data.

Preseason Week 3 begins August 27, with games including Pittsburgh at Buffalo and New England at Cleveland before a much larger Friday slate. The NFL’s official preseason schedule shows games continuing through the final weekend before the transition toward the regular season.

If trading continues growing, the preseason will begin looking less like an initial novelty spike.

If activity declines, the August 10–16 period may instead represent a concentrated burst as football returned.

Neither outcome can be established from one week.

That is why the next several reporting periods matter.

The Regular Season Will Be a Much Bigger Test

Preseason football has structural limitations.

The regular season removes many of them.

Games affect standings.

Playoff probabilities change every week.

Division races develop.

Super Bowl futures react.

Starting lineups become more predictable.

National television windows concentrate attention.

Most importantly, customers have a reason to return repeatedly from September through January.

That creates a much larger test of whether prediction markets can establish recurring sports participation.

The current 1x2bettingpro.com analysis of the NFL prediction-market arms race examined how Kalshi, Polymarket, DraftKings and FanDuel are positioning themselves for that competition.

The preseason numbers provide the first meaningful evidence of how intense it could become.

$167.8 Million Is More Important as a Signal Than a Record

The biggest mistake would be extrapolating 324% weekly growth across the season.

Markets do not grow that way indefinitely.

What matters is what caused the increase.

Actual football returned.

Preseason game contracts immediately displaced futures as the dominant source of NFL prediction-market activity.

Kalshi generated $113.1 million in preseason turnover.

Polymarket US also accelerated rapidly.

Props began expanding from a very small base.

And one exhibition matchup generated almost $20 million on a single platform during the reporting window.

That combination provides a much more useful signal than the 324% headline alone.

It suggests football customers are willing to trade individual games repeatedly even before those games count toward the standings.

The regular season will determine whether that behavior scales.

If it does, the NFL could become one of the most important recurring liquidity engines in the U.S. prediction-market industry.

If it does not, the August surge will remain an interesting example of how quickly event markets can react when a major sport returns.

Either way, the preseason has already produced something prediction-market companies wanted to see before September: meaningful activity around ordinary football games, not just Super Bowl futures or championship events.

The next test is whether $167.8 million looks large once the games actually start to count.