Update, Sunday, September 13:
Thirteen NFL games kick off today, starting at 1 p.m. ET, and every code on this page is live for all of them.
returns a $50 bonus on a $10 first deposit, Kalshi code DIMERS matches a $25 deposit with $25, and DraftKings is paying $200 in bonuses on a $5 first bet with no code required. The first week of football has already been a lesson in why prediction markets pay: the 49ers won outright as a 37¢ contract, Texas came from 20 down to beat Ohio State after Kalshi had the Buckeyes at 88¢ at halftime, and Oklahoma State beat Oregon as a 7¢ contract that paid $1. Tonight, Kalshi has the Cowboys at 60% against the Giants on $1.94 million of volume. This guide is refreshed daily through NFL Week 1, with the games closest to kickoff moved to the top.
Prediction markets and sportsbooks have both rolled out their biggest new-user bonuses of the year for the opening week of football, and for the first time the two categories are competing for the same deposit. Polymarket, Kalshi, Underdog and Novig are trading NFL and college football as event contracts priced from 1¢ to 99¢; DraftKings and Bet365 are running conventional bonus-bet deals alongside. Every one of those bonuses, the code that unlocks it, and what the markets are pricing for today’s games is below, in one place.
All six bonuses below are verified and active as of September 13, 2026. Where a code is listed, it goes in the promo or referral field during registration; where none is listed, the bonus attaches automatically through the link.
| Operator |
Type |
Code |
Current offer |
What it costs |
|
Prediction market |
DIMERS |
$50 bonus in trading funds ($60 total) |
$10 first deposit |
|
Prediction market |
DIMERS |
$25 bonus in trading funds ($50 total) |
$25 first deposit |
|
Sportsbook and prediction market |
No code required |
$200 in bonuses, paid as $50 every 7 days over 21 days |
$5 first bet |
|
Prediction market and pick’em |
DIMERS |
$50 in bonus entries, plus Keep Your Million access |
$5 first play |
|
Prediction market |
No code required |
$25 in trade credits |
$10 first deposit |
|
Sportsbook |
No code required |
$365 in bonus bets, win or lose ($150 in IL and TN) |
$10 first bet |
Measured against the deposit, the Polymarket code DIMERS is the most efficient of the six: $50 back on $10 in, credited the moment the deposit clears, with no trading-volume requirement before the bonus is yours. Kalshi’s $25-for-$25 is the cleanest one-to-one match on a prediction market. DraftKings has the largest headline number, though its $200 arrives in three weekly installments of bonus bets rather than as cash you can trade today.
Sunday, September 13 — Dimers Predictions for Every NFL Week 1 Game
Thirteen games run today, and every one of them is a live market on Polymarket and Kalshi. The table below is Dimers’ model on each matchup, built from 10,000 simulations per game; the two most-traded Sunday markets are broken out beneath it, and the other boards are linked for live tracking.
The 1 p.m. window has the day’s two closest markets. Kalshi has the Bills at just 52% (Yes 53¢) against the Texans on $2.16 million of volume, the largest of any Sunday game, where Dimers’ model has Buffalo at 58.1%; the 1.5-point spread is 49% and the total of 44.5 is a dead-even 50%. Jets–Titans is closer still: Tennessee 51% (Yes 52¢), New York 49%, on a 38.5-point total that is the lowest of the week. The Chargers at 78.9% and the Jaguars at 75.5% are the two heaviest favorites on Dimers’ board.
The most-traded Sunday market is the last one to kick off. Kalshi’s Cowboys–Giants board has taken $1.94 million, and Dallas has drifted up from 59% to 60% over the weekend. Dimers’ model has the Cowboys at 59.9% and −2.5. On Kalshi, the “chance” percentage is the implied probability and the Yes/No prices are what a $1 contract costs.
| Market |
Kalshi chance |
Kalshi price |
Dimers model |
| Cowboys to win |
60% |
Yes 61¢ / No 40¢ |
59.9% |
| Giants to win |
40% |
Yes 40¢ / No 61¢ |
40.1% |
| Cowboys to win by over 3.5 |
46% |
Yes 46¢ / No 55¢ |
DAL −2.5 |
| Over 47.5 total points |
51% |
Yes 51¢ / No 50¢ |
— |
| Giants over 22.5 points |
54% |
Yes 51¢ / No 50¢ |
— |
| Dallas over 25.5 points |
52% |
Yes 52¢ / No 52¢ |
— |
Polymarket last showed the same 60–40 split, with Dallas paying 1.65x and New York 2.5x. On Kalshi’s prop boards, Cam Skattebo is the favorite to score an anytime touchdown at 45% (Yes 45¢), ahead of Jaxson Dart at 30%, Isaiah Likely at 22%, Najee Harris at 20% and Malachi Fields at 16%. The yardage markets are priced with more conviction: Javonte Williams is 87% to rush for 40 or more (Yes 84¢), Skattebo 85% for 25 or more, and Dart 80% for 15 or more; CeeDee Lamb is 83% to reach 40 receiving yards (Yes 82¢), Isaiah Likely 81% for 15, George Pickens 77% for 40 and Jake Ferguson 73% for 15. Yes and No prices come from separate order books and will not always sum to 100.
Commanders at Eagles on Prediction Markets (4:25 P.m. ET, FOX)
The late-window headliner is the one Sunday game where the market is more confident than Dimers’ model. Kalshi has the Eagles at 68% (Yes 68¢) on $935,000 of volume against Dimers’ 66.7%, with Philadelphia to win by over 5.5 at 52%, the 44.5-point total at 46% to go over, Philadelphia over 24.5 points at 53% and Washington over 19.5 at 48%. Saquon Barkley is the touchdown favorite at 52% (Yes 52¢), with Jalen Hurts at 41%, DeVonta Smith at 34%, Dallas Goedert at 30% and Dontayvion Wicks at 22%. Hurts is 89% to rush for 10 or more yards, Jacory Croskey-Merritt 88% for 15 or more, Barkley 87% for 40 or more and Jayden Daniels 81% for 20 or more. In the receiving markets, Stefon Diggs is 88% to reach 15 yards, Goedert 83% for 15, Smith 82% for 25 (Yes 88¢) and Terry McLaurin 79% for 25. The
Commanders vs. Eagles live odds page
tracks the board through kickoff.
Monday, September 14 — Broncos at Chiefs (8:15 P.m. ET, ESPN/ABC)
The Week 1 finale is the closest market of the week and the one where Dimers’ model and the prediction markets disagree most. Dimers has Kansas City at 58.6% and −2.5; Kalshi has the Chiefs at just 55% (Yes 57¢) with the 2.5-point spread at 50%, and Polymarket has them at 56% (1.79x) with Denver at 44% (2.25x). On Kalshi’s touchdown board, Travis Kelce is 33% to score an anytime touchdown and Xavier Worthy 23%. The
Broncos vs. Chiefs live odds page
updates through kickoff.
How Week 1 Has Paid Out So Far — Three Favorites Down and a 7¢ Contract That Paid $1
The first four days of the football week were a case study in what the codes above actually buy. The Seahawks, 62% on Kalshi and 63% on Polymarket, beat the Patriots 13–10 on Wednesday but lost Sam Darnold to a hip injury on the opening drive and failed to cover the 3.5-point spread; the 43.5 total went well under. On Thursday the 49ers, priced at 36–37% on both platforms, beat the Rams 27–7 in Melbourne, paying 2.78x on Polymarket and returning $1 on a 37¢ Kalshi contract. Boston College (60%) beat Rutgers 28–21 and Missouri (65.7% on Dimers’ model) beat Kansas 38–21 on Friday, both covering. Saturday delivered the two biggest results: Texas, 53–54% pre-game, trailed Ohio State 20–3 at halftime while Kalshi’s live market had the Buckeyes at 88¢, then scored three unanswered fourth-quarter touchdowns to win 24–23; and Oklahoma State, a 7¢ contract on Kalshi and a 14.29x payout on Polymarket, beat Oregon 39–31 in the upset of the young season. Michigan beat Oklahoma 17–10 as the model underdog, while Tennessee (81–82%) beat Georgia Tech 45–24 and covered. Every one of those markets settled at $1 per winning contract, which is the whole point of holding trading funds rather than bonus bets.
Polymarket Code DIMERS — $50 Bonus on a $10 Deposit (verified September 13, 2026)
Polymarket Code DIMERS guarantees the popular "free $50" promo for NFL and NCAAF markets this September.
The Polymarket code DIMERS is the headline bonus of the week. New users who enter it at registration and deposit $10 receive $50 in trading funds, for a $60 opening balance that works on every open Polymarket market, from tonight’s Cowboys–Giants contracts to the 2028 presidential nominee markets. It is a flat credit, not a matched-volume promotion: there is no minimum number of trades before the $50 is usable. Our
Polymarket code DIMERS announcement for the season opener
carries the full deposit-and-bonus walkthrough.
-
and select Sign Up.
- Enter the Polymarket code
DIMERS
in the promo/referral field during registration. It cannot be added to an existing account.
- Complete identity verification, which every new Polymarket US account requires.
- Deposit $10. The $50 bonus is credited immediately.
- Trade any open market. Each cent price is the market’s implied probability, and a winning contract pays $1.
Terms in brief: new Polymarket US accounts only, one bonus per user, minimum first deposit $10, bonus of $50 in trading funds, valid across sports, politics, crypto, finance and global-event markets. Withdrawals are subject to Polymarket’s standard terms.
Kalshi Code DIMERS — Deposit $25, Get $25 (verified September 13, 2026)
Kalshi has rebuilt its new-user bonus for the football season as a flat deposit match. Register with the
, deposit $25, and Kalshi adds $25 in bonus funds for $50 to trade. There are no tiers, no trade-count requirement and no qualifying window; the deposit alone unlocks the bonus, and the funds are live across every Kalshi market immediately, including the NFL game lines and player-prop boards priced above. Kalshi is a CFTC-regulated exchange and is available in most US states; the states where it is not are listed in the disclaimer at the foot of this page.
-
and create a new account with the Kalshi code
DIMERS.
- Verify your identity.
- Deposit $25 to receive the $25 bonus, for $50 in total trading funds.
- Trade any market. The “chance” percentage is the implied probability; a Yes contract bought at 61¢ pays $1 if it settles Yes.
DraftKings is the one operator on this page running a single new-user deal across both a sportsbook and a prediction market. New customers who
and place a $5 first bet receive $200 in bonuses, issued as $50 in bonus bets every seven days over 21 days. No promo code is needed; the reward attaches automatically through an eligible link. The $200 is non-withdrawable bonus-bet credit rather than cash, and the deal ends September 20, 2026, which makes today the last NFL Sunday to claim it.
Underdog Code DIMERS — Play $5, Get $50 in Bonus Entries, Plus Keep Your Million
Underdog runs two products under one login: Underdog Fantasy (Pick’em, Champions and Best Ball) and Underdog Predict, a CFTC-regulated prediction market that mirrors moneyline, spread and total markets as 1¢–99¢ contracts. New customers who register with the
and play $5 receive $50 in bonus entries. Registration also unlocks Underdog’s Keep Your Million promotion, which is still running through NFL Week 1: new users receive a $1,000,000 balance of Milly Bucks, answer up to 20 two-outcome questions, and whatever survives converts to bonus entries worth up to $1,000,000 after a first deposit, subject to a 1x play-through and Underdog’s official rules. Keep Your Million is a separate promotion, not a deposit match.
Novig — Deposit $10, Get $25 in Trade Credits (no Code Required)
Novig is the smallest of the four prediction markets here and the cheapest to try.
who deposit $10 receive $25 in trade credits, a 250% return on the deposit, usable across Novig’s NFL and college football markets. No code is required; the bonus attaches through the link.
Bet365 — Bet $10, Get $365 in Bonus Bets, Win or Lose
Bet365 is running the largest sportsbook bonus of the opening week.
who place a $10 first bet receive $365 in bonus bets whether that bet wins or loses. In New Jersey, Pennsylvania and Michigan the $365 comes with 50 casino spins; in Illinois and Tennessee the bonus is $150. Bet365 is a sportsbook, not a prediction market, so its bonus is paid as bonus bets rather than tradeable funds. The $365 figure is a launch-week number and may not last the season.
Prediction Market Vs. Sportsbook — Which Bonus to Take for NFL Week 1
The difference comes down to what the bonus becomes once it lands. On Polymarket, Kalshi, Underdog Predict and Novig, the bonus is trading funds: you buy a Cowboys contract at 61¢, it pays $1 if Dallas wins, and you can sell the position before kickoff or mid-game if the price moves your way, which is exactly what anyone holding Texas at 13¢ at halftime on Saturday could have done. On DraftKings and Bet365, the bonus is bonus bets: you place them like a normal wager and keep the winnings but not the stake. Prediction markets show a live, tradeable price for both sides of every game; sportsbooks show fixed odds. Neither is universally better, but the entry costs differ sharply, and if the question is how to turn the smallest deposit into the most usable balance for Week 1, the Polymarket code DIMERS at $10 in and $60 out is the answer.
The Polymarket code is DIMERS. New US users who enter it at registration and deposit $10 receive a $50 bonus in trading funds, for a $60 opening balance. It is verified and active as of September 13, 2026.
The Kalshi code DIMERS returns a $25 bonus on a $25 first deposit, for $50 in total trading funds. Kalshi treats promo codes and referral codes as the same thing, so either label applies to DIMERS.
No. The DraftKings deal of $200 in bonuses on a $5 first bet attaches automatically when you sign up through an eligible link. The bonuses are paid as $50 in bonus bets every seven days over 21 days, and the deal ends September 20, 2026.
Is the Underdog $1 Million a Deposit Match?
No. Keep Your Million is a separate promotion in which new users play a game of up to 20 questions with a $1,000,000 Milly Bucks balance and keep whatever survives as bonus entries, up to $1,000,000, after a first deposit. The standard new-user bonus with code DIMERS is $50 in bonus entries on a $5 play.
Yes. DIMERS is the code on Polymarket, Kalshi and Underdog, and each is a separate new-user bonus on a separate platform. DraftKings, Novig and Bet365 need no code.
Which States Can Trade on Kalshi and Polymarket?
Polymarket US is open to eligible new accounts nationwide. Kalshi is available in most states but not in Arizona, Illinois, Massachusetts, Maryland, Michigan, Montana, New Jersey or Ohio. Underdog’s fantasy bonus is not valid in Maryland, Michigan, New Jersey, New York, Ohio or Pennsylvania; Underdog Predict is available more broadly to US residents 18 and over.
Conclusion — Use Polymarket Code DIMERS Before the 1 P.m. Kickoffs Today
Six bonuses are live for the first NFL Sunday of the season, and the only one that turns $10 into $60 before the early window is the
. Kalshi code DIMERS adds $25 on a $25 deposit, DraftKings pays $200 over three weeks on a $5 bet, Underdog pairs $50 in bonus entries with Keep Your Million, Novig turns $10 into $25 in trade credits, and Bet365 pays $365 in bonus bets on a $10 wager. This page will be updated again for Monday night’s Broncos–Chiefs game with the day’s prices and any change to the bonuses above.
Polymarket: Offer valid for new Polymarket US accounts only; one bonus per user. Deposit $10 with code DIMERS to receive $50 in trading funds. Subject to Polymarket’s terms.
Kalshi: Must be 18 years or older and have a legal, U.S. residential address within the applicable state, D.C., or U.S. territories. Not available in AZ, IL, MA, MD, MI, MT, NJ, and OH. Deposit $25 and receive a $25 bonus in trading funds; bonus funds must be traded before any resulting funds can be withdrawn. New Kalshi accounts only; one offer per user.
Underdog: Must be 18+ (19+ in AL, NE; 19+ in CO for some games; 21+ in AZ, MA, and VA) and present in a state where Underdog Fantasy operates. Terms apply. Offer not valid in MD, MI, NJ, NY, OH, and PA. Concerned with your play? Call 1-800-MY-RESET or 1-800-GAMBLER or visit
www.ncpgambling.org; NY: Call the 24/7 HOPEline at 1-877-8-HOPENY or Text HOPENY (467369). Trading involves risk, including total loss on positions. Trading decisions and their consequences are your sole responsibility. Nothing on underdogexchange.com constitutes a recommendation, solicitation, or offer to buy or sell any financial instrument. UDX is subject to CFTC regulatory oversight. Promotion issued by affiliate.
DraftKings, Bet365 and Novig: 21+ (18+ where permitted) and physically present in an eligible state. New customers only. Bonus bets and trade credits are non-withdrawable and subject to each operator’s terms. Gambling problem? Call 1-800-GAMBLER.
Advertiser disclosure
Available with Dimers Pro
