Sign up for a new DFS account today with the Underdog promo code TOPACTION to secure a $100 bonus offer. Simply play a $5+ initial entry at Underdog on Monday Night Football or any other event. Get $100 in bonus funds or $100 in entries with the Underdog promo code TOPACTION. You have a 50-50 chance at claiming each sign-up offer — it is randomized which bonus you get.
This sign-up offer is available in a majority of U.S. states, which represents one of the best alternatives to the top NFL betting promos. Create entries using your bonus with the Underdog promo code TOPACTION on Buccaneers vs. Lions and Texans vs. Seahawks today. Check out the chart below for more information about the sign-up bonus.
| Underdog Promo Offer | DFS States Available | Underdog Promo Code Sign-Up Link |
|---|---|---|
| Play $5, Get $100 in Bonus Funds or Entries | AL, AK, AR, DC, FL, GA, IL, IN, KS, ME, MS, MN, NE, NM, NC, ND, OK, OR, RI, SC, SD, TX, VT, VA, UT, WI, WY | TOPACTION |
Underdog Promo Code TOPACTION: Get $100 Bonus for Monday Night Football
Use the Underdog promo code TOPACTION to claim your $100 in bonus funds or $100 in entries today. Remember, you have a 50% chance at getting $100 in bonus funds and a 50% chance at getting 10 $10 entries. You must play an initial entry of $5 or more to be eligible for the bonus.
There are two different ways to play your first entry at Underdog: Standard and Flex. A Standard entry requires you to win all of your picks to receive the largest potential payout, while a Flex entry yields a smaller payout if you go perfect and an even smaller payout than that if you lose just one pick.
Here is an example of a $5 Standard entry I created with Monday Night Football picks that has a 7.4x payout multiplier:
- Baker Mayfield Higher Than 243.5 Passing Yards
- Sam Darnold Lower Than 223.5 Passing Yards
- Jameson Williams Higher Than 0.5 Rush + Rec TDs
Suppose I place this entry as my $5 initial entry with the Underdog promo code TOPACTION. Here is what I receive based on the outcome of it:
- If all of my picks win, I receive a $37 total payout ($32 profit + $5 entry back) and $100 in bonus funds or entries.
- If one or more of my picks lose, I receive $100 in bonus funds or entries.
Underdog Promo Sign-Up Steps: Monday, October 20, 2025
Use the steps outlined below to claim your $100 bonus with the Underdog Fantasy promo code TOPACTION today:
- Step 1: Click this link or any sign-up module on this page to download the Underdog app.
- Step 2: Create a username and password.
- Step 3: Fill in your email, date of birth, and all other required personal information to create a new Underdog account.
- Step 4: Enter the Underdog promo code TOPACTION and play a $5+ entry to get $100 in bonus cash.
- Step 5: Agree to the Underdog Terms of Use and Privacy Policy.
- Step 6: Click "Sign Up."
- Step 7: Make your first deposit of $10+.
- Step 8: Create your first entry at Underdog with picks from Monday Night Football.
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 operates. Terms apply. Offer not valid in MD, MI, NY, OH, and PA. Concerned with your play? Call 1-800-GAMBLER or visit www.ncpgambling.org; NY: Call the 24/7 HOPEline at 1-877-8-HOPENY or Text HOPENY (467369)" with "Must be 18+ (21+ MA & AZ, 19+ AL, NE) and present in a state where Underdog operates. subject to change. Terms apply."
