How to use our stat projections for live Cowboys-Giants SNF player props

Sunday Night Football is the last Week 1 game on the board, and it is the one where live prop trading works best: a national window, 900-plus open markets on Polymarket, a full yardage ladder on Kalshi, and a Dimers projection set for every skill player on both rosters. This guide walks through exactly how to put those three things together—what to compare, what a gap looks like, when to buy, when to sell, and what to leave alone—using tonight's Cowboys vs. Giants board as the worked example.

One ground rule before the numbers. A Dimers projection is a mean—the average outcome across 10,000 simulations. A prop line set at the mean is roughly a coin flip. The edge is not in the projection itself; it is in the distance between the projection and where a market has put its line.

New York Giants wide receiver Odell Beckham Jr. works out prior to an NFL football game against the Dallas Cowboys, Sunday, Sept. 13, 2026, in East Rutherford, N.J. (AP Photo/Yuki Iwamura)

Step 1: Get the Two Boards and the Projections in Front of You

Open the Cowboys vs. Giants live odds page for the current prices, then pull the Dimers PPR projections for both teams. Here is the full projection set at publication, alongside the pregame news that matters: Malik Nabers and Odell Beckham Jr. are active for New York, Najee Harris is inactive, and Israel Abanikanda is inactive for Dallas a day after Malik Davis went to injured reserve.

Step 2: Read the Game Lines First—they Set the Context for Every Prop

Props do not trade in isolation. A 62% favorite with a coin-flip spread is a one-score game, and one-score games keep both offenses on the field into the fourth quarter—which is why the totals lean over. Here are the two boards side by side, Kalshi in cents and Polymarket in implied probability:

The two markets agree within two points on everything. When they do, the game lines are not where the edge lives—move on to the props.

Step 3: Compare Every Polymarket Fantasy-Points Line to the Dimers Projection

Polymarket's PPR board is the cleanest place to apply the projections, because the market and the model measure the same thing. The table below puts each contract next to its projection and reads the gap:

Three things jump out. Malik Nabers at 11+ is priced at 56% against a 14.0 projection—the widest positive gap on the board at three full points, and the market took seven off him tonight on a managed-workload read the projection does not share. Jaxson Dart at 18+ is next: 46% against a 20.4 projection, and the market has been selling it, down nine points on the inactives. Dak Prescott at 22+ is the mirror image—33% against a 20.1 projection, meaning the No side is the one carrying the model's support.
The Skattebo, Likely, Lamb and Pickens contracts all sit within a point and a half of their projections. Those are fair prices, not opportunities—leave them for the live phase.

Step 4: Cross-Check the Kalshi Yardage Ladder for the Same Players

Kalshi prices yardage thresholds rather than fantasy points, so the projection cannot be laid directly on top of it—but the two boards should tell a consistent story about each player, and where they do not is worth a second look:

Javonte Williams is the consistency check. Kalshi has him at 87% to clear 40 rushing yards; Polymarket has him at 55% to clear 70 and only 35% to reach 20 PPR points against a 17.4 projection. All three agree: heavy volume, modest ceiling. The projection sits below the 20-point PPR line, so the No side there and the Yes side on the low Kalshi yardage threshold are the same view expressed twice.
Dart is the reverse. Kalshi has him at 80% for 15 rushing yards, Polymarket at 54% for 30, and the PPR line undershoots his projection by 2.4 points. A quarterback the market expects to run is a quarterback whose fantasy line should be higher than 18—the ladders and the model agree, and only the PPR price is out of step.

Step 5: Touchdown Contracts Are a Different Instrument—trade Them Differently

A yardage contract accumulates: Williams either reaches 40 yards or he does not, and the price climbs steadily as he gets there. A touchdown contract is binary and lumpy—it barely moves between drives and spikes inside the 20. That changes how you trade it. Skattebo at 45–46% on both boards, with Harris out and a 14.0 projection, is a fair pregame price; the live opportunity is the No side after a scoreless first half, or the Yes side on a Giants red-zone snap before the market catches up. Prescott at 57% for two passing scores against Dart at 40% is the market's read on how each team finishes drives—Dallas through the air, New York with Dart's legs and Skattebo—and the Dart rushing ladder above backs it.

Step 6: The Live Phase—when to Buy, When to Sell, When to Sit

Buy Yes early on positive-gap contracts. Nabers 11+ PPR at 56% and Dart 18+ at 46% are the two the model likes most. Both are cheapest before kickoff; the first completed drive reprices them.
Sell into production, do not wait for settlement. A Kalshi yardage contract bought at 78¢ that trades at 95¢ after one long run has delivered most of its value. Taking 17¢ of the 22¢ available and redeploying it beats holding through a fumble. Positions can be sold at any time before an event settles, on both platforms.
Buy No on the lines the projection undershoots—after the market confirms. Prescott 22+ PPR at 33% is already priced toward No; the better entry is if a quick Dallas score pushes the Yes side up on recency. Williams 20+ PPR at 35% works the same way.
Leave fair prices alone until the game moves them. Skattebo, Likely, Lamb and Pickens are all within a point and a half of projection. There is nothing to do with them at kickoff. There is a great deal to do with them once one team has the ball for six minutes and the other does not.
Watch the two boards against each other. Skattebo anytime TD is 45% on Kalshi and 46% on Polymarket. When a live spike opens that gap to five or six points—which happens on red-zone snaps, because the two markets do not reprice at the same speed—the cheaper side is the one to buy.

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Review the Polymarket Promo Code's updated terms and conditions to ensure you get the best value.

Running this playbook across both boards requires an account on each, and both platforms are carrying a new-user code for Dimers readers tonight. The Kalshi promo code DIMERS returns a $25 bonus on a $25 deposit—$50 in trading funds on a CFTC-regulated exchange. The Polymarket promo code DIMERS returns a $50 bonus on a $10 deposit—$60 in trading funds on a peer-to-peer market. Both go in the promo/referral field at registration, both must be entered at sign-up, and both are limited to new accounts; our full Cowboys vs. Giants promo code breakdown has the terms in detail.

Kalshi Code DIMERS unlocks a versatile referral bonus in September 2026.

Step 7: Know the Rules That Settle the Contracts

• Inactives settle contracts. Najee Harris was priced at 20% to score on Kalshi before he was ruled out; that contract now settles No. Check the inactives report 90 minutes before kickoff, every week.
• Anytime touchdown excludes passing touchdowns on Polymarket—rushing, receiving, return and fumble-recovery scores all count; a quarterback's passing touchdowns do not.
• Overtime. Full-game yardage and touchdown markets include overtime; second-half and fourth-quarter markets on Polymarket do not.
• The spread is the cost. Kalshi's Yes and No prices on a contract sum to more than $1 (Skattebo TD: 45¢ + 56¢). That gap is what you pay to trade; it is why selling into production beats round-tripping a position.
• Liquidity thins late. A contract at 95¢ in the fourth quarter may not have a buyer at 95¢. Take profit while the order book is deep.

Conclusion: the Projection Is the Map, the Market Is the Terrain

Tonight's board has three contracts where the Dimers projection and the market disagree by more than a point and a half—Nabers 11+ PPR, Dart 18+ PPR and Prescott 22+ PPR—and a dozen more that are fairly priced at kickoff and will not stay that way once the game starts. The method does not change from week to week: pull the projections, lay them against every line on both boards, trade the gaps, sell into production, and let the fair prices come to you.
Kalshi odds and Polymarket odds reflect live trading and update in real time. All prices and projections current as of Sunday, September 13, 2026. This guide is educational; it is not a recommendation to enter any specific position.

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