NFL Champion 2027 and the Season Books

Three weeks to kickoff, and the two books that matter most on this page were the two this workspace did not have.

The conference paths. This page carried Polymarket's AFC and NFC championship markets, which turn $39 and $28 a day. Kalshi's equivalents turn $151,042 and $42,606—and the AFC book is where the season's largest standing positions live: $443,614 of open interest on Denver, $398,295 on Houston, $313,326 on Cincinnati, $268,376 on Buffalo. Nearly $1.4M held across four teams none of which is priced above 15%.

Houston is the whole AFC book. At 9.5%, fifth by price, Houston took $70,863—47% of the entire conference market's daily flow, more than eight times the favourite Buffalo's $8,231.

And the single most-traded NFL question right now is not the championship at all. Cleveland's Week 1 starting quarterback is a genuine coin flip—Deshaun Watson 50.5%, Shedeur Sanders 49.5%—on $117,300, and Sanders' leg outtrades Watson's by half again, $68,981 to $44,477. No other team's Week 1 quarterback book turns more than $3,897.

The championship field on both real-money books. Kalshi turns $790,703 across all thirty-two teams; Polymarket's mirror turns $298,964—a 2.6-to-1 ratio, far and away the tightest cross-exchange spread on any sport this catalog covers.

Prices agree, roughly: Los Angeles Rams 16% on Kalshi against 14.5% on Polymarket, with Buffalo, Baltimore and Seattle clustered between 7.5% and 8.5% on both.

The money does not. On Polymarket the Rams are fourth by volume at $4,112, behind Dallas at 5.1% on $17,174, Seattle at 7.5% on $13,466 and Philadelphia at 4.5% on $11,808. The favourite is the fourth-most-traded team in its own championship book.

The price leader against the volume leader, on the exchange that carries the depth. Los Angeles at 16% is the market's team. Houston at 5%—9.5% to win the AFC alone—is the market's position: $398,295 of open interest in the conference book and 47% of its daily flow.

That divergence has held for weeks and is now the defining feature of the 2027 season books. Either the price is slow or the flow is wrong, and the first four weeks of the regular season will say which.

The conference paths on Kalshi, where they actually trade.

The AFC is a wide-open board with enormous held positions: Buffalo 15%, Baltimore 12.5%, Kansas City 11.5%, Los Angeles Chargers 10.5%, Houston 9.5%, New England 9.5%, Cincinnati 8.5%, Denver 8.5%—eight teams inside seven points, and $1.9M of open interest spread across them. The NFC is thinner at $42,606 and correspondingly more concentrated.

Note the shape: the AFC book turns 3.5x the NFC's. The conference the market thinks is harder to win is the one it is willing to trade.

The coin flip in Cleveland, and the reason it is the most-traded team-level question of the preseason.

Deshaun Watson at 50.5% against Shedeur Sanders at 49.5%, on $117,300—more daily volume than the Coach of the Year, Offensive Rookie of the Year and best-record books combined. Sanders' contract took $68,981 to Watson's $44,477, so the money leans rookie while the price sits on the veteran by a single point.

Every other Week 1 quarterback book listed is dead by comparison: Atlanta $3,897, Las Vegas $3,586, Arizona $951, Kansas City $20. One quarterback battle is carrying the entire category.

Below: the championship-game matchup board, $472,316 in a day. Its four busiest pairings—Buffalo–Chicago at 2%, Baltimore–Chicago at 1%, Cincinnati–Philadelphia at 1.5% and Kansas City–Chicago at 0.5%—took $305,806 between them, 65% of the board on four outcomes priced at 5% combined. The week-one starting-quarterback book that sat here has settled.

• $70,863 on Houston at 9.5%. Forty-seven percent of the AFC championship book's daily flow on the fifth-priced team, plus $398,295 of open interest. If one number decides whether the preseason pricing was right, it is this one.
• The Rams are fourth by money in their own book. Sixteen percent to win it all and $4,112 of Polymarket volume, behind Dallas, Seattle and Philadelphia. Price leadership and money leadership have come apart in every sports book this catalog has refreshed this month; the NFL is the largest example.
• Cleveland is a genuine 50.5/49.5. The tightest two-way market in the catalog, on $117,300, resolving September 15. Sanders' leg is the deeper of the two—watch whether preseason snaps move it before the price does.
• $1.9M of AFC open interest across eight teams inside seven points. No conference book this catalog covers has ever been this flat with this much money standing behind it. A wide-open AFC is the market's actual position, not a hedge.
• 2.6 to 1 is the tightest cross-exchange volume ratio in sports. Kalshi $790,703 against Polymarket $298,964 on the championship. Compare the Champions League at 35 to 1 the other way, or the BMW at 274 to 1. American football is the one sport where both books are genuinely liquid.