Prices as of Wednesday, September 2, 2026, 8 a.m. ET, from Kalshi's live order books and the OddsShopper live odds screen.
The Seahawks vs Patriots spread for the season opener on Wednesday, September 9, at Lumen Field is Seattle -3.5 at nearly every sportsbook, and it has been since the schedule came out in May. The game is a rematch of Super Bowl LX, which Seattle won 29-13 in February, and the argument is whether that number should be 4 or 3. On Tuesday night Kalshi picked 4: two large orders pushed the price of Seattle covering past 50 cents. The sharpest sportsbooks did not follow. Pinnacle still leans toward 3, the exchange's own "Seattle wins" price never moved, and six models that were never shown a price call the cover a coin flip. Our read: 3.5 is the right number, the Patriots side is the better buy, and it is cheaper on Kalshi than at Pinnacle.
How to read the prices.A Kalshi price in cents is the crowd's probability, so a 51-cent contract is the market saying about a 51% chance, and it pays $1 if the thing happens. Prices on this page are the live bid and ask pulled early on September 2, 2026, and the trade history is the exchange's own tape.
What Traded On Kalshi Tuesday Night
Just after 6:30 p.m. ET on Tuesday, September 1, one Kalshi order swept about 9,400 contracts of "Seattle wins by more than 3.5 points" and cleared the price from 49 cents to 51. A second order of roughly the same size followed three minutes later and printed as high as 53. Holding "no" on that contract is the same position as taking the Patriots +3.5 at a sportsbook, which is why this rung, and not the winner market, is where the game's real argument lives.
By 8 p.m. the price had settled at 50 to 51 cents, after eight straight days closing between 47 and 49. Those two sweeps were nearly all of the evening's 20,106 contracts, which reads as one or two accounts deciding the price was wrong and paying to fix it. I looked for anything stamped near the first order and found nothing: no injury news, no transaction, and no practice report, because the first official ones of the week had not been issued. As of Wednesday morning the move had held for about 14 hours.
The other side had already been bought. At 2:29 p.m. Tuesday, four hours before the Seattle sweep, one fill of 1,492 contracts of "New England wins by more than 1.5" came in at 33 cents, on a contract that had traded 32 all week. The board is two views of the margin, priced four hours apart.
Why The Winner Price Is The Tell
Kalshi's plain "Seattle wins" contract, the most-traded market in the game, sat at 62 cents bid and 63 ask through the burst and was still there Wednesday morning. A spread and a moneyline are two views of the same set of final margins and should move together. If the crowd had learned something that made Seattle likelier to win by 4, it should also have made Seattle a little likelier to win at all, and it did not. The 12 cents between "wins" and "wins by 4" is the share of outcomes where Seattle wins by a field goal or less. Three is the most frequent winning margin in the NFL, which makes the half point on either side of it the most expensive half point in the sport, and Tuesday's buyers paid to be on the far side of it.
The Last Burst Reverted
This game has done this once before. On Sunday, August 23, the winner market traded 80,655 contracts in a day, more than the previous two weeks combined, and Seattle printed as low as 56 cents before closing back at 63. The cover contract printed as low as 40 that day and closed at 47. The money stayed, with open interest up about 27,000 contracts, but the price went back to where it started within hours. That is the fact to re-check before you treat 51 cents as the new number.
Where The Sportsbooks Sit On 3.5
On Wednesday morning all but two of the 30-plus venues on the live odds screen posted Seattle -3.5; Bovada was at 4 and PointsBet at 4.5. What differs is the juice on each side, which is how a sportsbook says which side it would rather not take. Strip the book's margin out of each pair of prices and you get a fair probability that Seattle covers, the same unit as the Kalshi cent price.
| Venue | Seattle -3.5 | New England +3.5 | Fair chance Seattle covers, vig removed |
|---|---|---|---|
| Kalshi (Bid 50 / Ask 51) | n/a | n/a | 50.5% |
| FanDuel | -115 | -111 | 50.4% |
| BetMGM | -110 | -108 | 50.2% |
| Caesars | -110 | -109 | 50.1% |
| DraftKings | -110 | -110 | 50.0% |
| Circa | -110 | -110 | 50.0% |
| NoVig | +100 | -102 | 49.8% |
| BetRivers | -109 | -112 | 49.7% |
| Pinnacle | -101 | -111 | 48.9% |
| Bet105 | -101 | -111 | 48.9% |
| WynnBET | -101 | -116 | 48.3% |
Sportsbook prices from the OddsShopper live odds screen, September 2, 2026, 8 a.m. ET; 33 venues posted 3.5, and the de-vigged fair number across the sportsbooks and other exchanges, Kalshi excluded, ran from 47.8% to 50.4% with a median of 49.8%. Kalshi's figure is the midpoint of its bid and ask, the gap that is the exchange's version of the vig.
Read the column top to bottom and the split is plain. The recreational books that see the most public money on a Super Bowl rematch, FanDuel, BetMGM and Caesars, shade a hair toward Seattle covering. DraftKings and Circa sit dead even. The books sharp bettors price against, Pinnacle, Bet105 and the low-hold exchange NoVig, shade toward the Patriots: Pinnacle charges more to take New England +3.5 than to lay Seattle, which is the book saying the true number sits closer to 3 than to 4. Kalshi, at 50.5%, sits above every sportsbook on the board.
In money, the Patriots side is cheaper on the exchange than at Pinnacle by about $10 per $100 on identical risk, before Kalshi's trading fee takes a few dollars of that back. The moneyline shows no such split: the books and the exchange all put Seattle winning about 62% of the time, with Kalshi at the low end of that range. The exchange is saying that when Seattle wins, it wins by more than a field goal more often than the books think.
Why The Number Wants To Be 4, And Why It Cannot Get There
The case for Seattle by 4 or more is the case that won the Super Bowl, and it is intact. Seattle's defense sacked Drake Maye six times in February and, per ESPN's Bill Barnwell, charged 14 of its pressures that night to left tackle Will Campbell, the most by any player in any game all season. Seattle kept that front, re-signed Leonard Williams and paid Devon Witherspoon in August. Maye will play his first game since the Super Bowl with zero preseason snaps; per ESPN, Vrabel estimated about 84 full-team reps for him across the joint practices, and it was Vrabel who said on August 23, per Boston.com, "I do not think we have a very deep team." A loud home building against a quarterback whose protection failed in this exact matchup is the shape of game that produces a two-score margin.
The case against 4 is why DraftKings has not posted one since the schedule came out on May 14, and Dave Loughran laid it out in full in his Week 1 picks. Seattle is not the roster that won. Kenneth Walker III, the Super Bowl MVP, left for Kansas City in March; Klint Kubiak took the Raiders' head-coaching job, so Brian Fleury calls plays for the first time on September 9; Zach Charbonnet is on reserve/PUP, leaving first-round rookie Jadarian Price to carry the backfield. The secondary that held New England to 48 first-half passing yards in February lost Coby Bryant, Riq Woolen and Bud Clark, cut Trevon Diggs and Noah Igbinoghene, and cannot use Terrion Arnold, signed on August 29 and parked on the commissioner's exempt list. Against that group New England lines up A.J. Brown, acquired from Philadelphia in June, while Christian Gonzalez, the Patriots' best corner, returned to practice on August 24 after an August 10 injury, still without the extension the two sides are negotiating.
The whole tension in one sentenceSeattle's advantage is a pass rush against a bad protection unit, and Seattle's weakness is a rebuilt secondary against the best receiver New England has had in a decade. A pass rush wins by 7. A shootout is decided by 3. The market has spent the summer unable to decide which game it is watching, and the number has sat at 3.5 because 3.5 is the price of not deciding.
Loughran took the Patriots +3.5, specifically "no" on this exact Kalshi contract at 52 cents, on the grounds that a favorite that cannot become a 4 in three and a half months of public betting is telling you something. His line for getting out was the number moving to 3. It moved the other way instead: the "no" side he priced at 52 cents on Monday cost 50 on Wednesday morning, and nothing on Tuesday's tape was information.
Six Models, Shown No Prices
We asked six AI models to price this game on Wednesday morning without showing them a single market price, only a card of the facts above: rosters, injuries, the Super Bowl pressure numbers, Vrabel's depth comment, the play-caller change. Each had to price the winner contract and the cover contract from one consistent view of the final margin. Two of the eight seats we normally run, ChatGPT and Gemini, were not available, so weigh this as a six-seat read.
| Seat | Seattle wins | Seattle by more than 3.5 |
|---|---|---|
| Claude Fable | 59.5% | 45.5% |
| Claude Opus | 66.0% | 54.0% |
| Claude Sonnet | 63.0% | 49.0% |
| GLM 5.2 | 64.0% | 54.0% |
| Kimi K3 | 62.5% | 49.5% |
| DeepSeek V4 | 68.5% | 44.0% |
| Six-Seat Blend (Simple Average) | 63.9% | 49.3% |
| Kalshi, Midpoint Of Bid And Ask, Sept. 2 | 62.5¢ | 50.5¢ |
Generated September 2, 2026, with no market price in the prompt.
On the winner the six seats land within a point and a half of the exchange. On the cover the blend is a coin flip, one point under Tuesday's buyers and one point over Pinnacle, and it hides a real split. Opus and GLM see Seattle by about 5 to 6 and put the cover at 54%; Fable and DeepSeek center the margin closer to 3 and put it in the mid-40s. Every seat named the same two drivers, Seattle's pass rush against Maye's protection and Seattle's gutted cornerback room against A.J. Brown, and simply weighted them differently.
DeepSeek's pair is the odd one out. A 68.5% chance to win against a 44% chance to cover puts about a quarter of all outcomes on Seattle winning by a field goal or less, roughly double what any other seat or the market assigns, and it is the number pulling the blend down. Without that seat the other five average 50.4% on the cover, the exchange's own midpoint. The models reproduced the sportsbook board. They did not find a reason the number should be 4.
More live boards from the same panel: New England vs Seattle, who wins the opener (Seattle wins, 63¢ to buy) · Kalshi NFL picks, every Week 1 game seat by seat (New England wins, 39¢) · the Kalshi NFL Week 1 board (all 16 games priced). Prices as of September 2, 2026, 8:40 a.m. ET.
The Bottom Line
What settles the argument is the injury report, not the price history. The first official reports of game week will name the player who moves this number: Christian Gonzalez, whose full participation is the difference between a Patriots secondary with a No. 1 corner and one without. A Gonzalez extension before kickoff cuts the same direction as his health. Either headline pins this number at 3.5 or takes it to 3, not to 4. Until one arrives, the read the board has given all summer holds: Seattle wins about 62% of the time, covers 3.5 about half the time, and the half point in between is the most expensive one in football. If you want the Patriots side, the exchange is the cheaper place to buy it.
The live odds screen shows every book's number on this spread side by side, so you can see which sportsbook is shaded toward the side you want before you pay the juice. It is free for a week with OddsShopper Pro, and code FIELDGOAL20 takes 20% off your first month if you stay past the week.
Every Kalshi price above was fetched from the exchange on September 2, 2026, and the trade-by-trade history is Kalshi's own tape. Sportsbook prices are from the OddsShopper live odds screen at the same hour. Roster and injury facts are cited to ESPN, Boston.com and the teams as linked or named. If you or someone you know has a gambling problem, call 1-800-GAMBLER.
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