When you sign up with the Underdog Fantasy promo code TOPACTION, claim the new $100 bonus offer. Simply register for a new DFS account and play a $5+ initial entry to get $100 in bonus cash. Your initial entry with the Underdog Fantasy promo code TOPACTION can contain picks from any sport, including Week 4 NFL games.
Underdog Fantasy is one of the best daily fantasy sports apps on the market, and you can get started with the Underdog promo code TOPACTION now to claim a welcome bonus. Use the sign-up module below to activate your offer.
You can register at Underdog Fantasy today in a majority of U.S. states, including many that do not have legal online sports betting yet. Check out the chart below for information about which states you can take advantage of one of the best alternatives to the top NFL betting promos in.
| Underdog Fantasy Promo Offer | DFS States Available | Underdog Promo Code Sign-Up Link |
|---|---|---|
| Play $5, Get $100 | 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 Fantasy Promo Code TOPACTION: Play Entries on Week 4 NFL
Register now with the Underdog Fantasy promo code TOPACTION to take advantage of one of the best DFS welcome bonuses on the market. Simply play a $5+ initial entry to get $100 in bonus cash back, regardless of the outcome of your entry.
Underdog Fantasy provides users with a unique experience where you compile picks on the Higher or "Lower" for player projections into entries. The more picks you add into an entry, the higher your payout multiplier becomes. There are two different ways to place an entry: Standard or Flex. A Standard entry requires all of your selections to hit for a payout, but it delivers the largest multiplier. A Flex entry pays less for perfection but allows you to miss one pick and still receive a small return.
Here is an example of an entry I created with the Underdog Fantasy promo code TOPACTION:
- Patrick Mahomes HIGHER than 24.5 Rushing Yards
- Zay Flowers HIGHER than 62.5 Receiving Yards
- Ashton Jeanty HIGHER than 0.5 Rush + Rec TDs
Suppose I place this entry as a $5 Standard, which has a 5x payout multiplier, with the Underdog Fantasy promo code TOPACTION.
- If all of my picks win, I receive a $25 total payout ($20 profit + $5 entry back) and $100 in bonus cash.
- If one or more of my picks lose, I receive the $100 in bonus cash only.
How to Claim Your Underdog Fantasy Promo: Sunday, September 28, 2025
Follow 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 Week 4 NFL games.
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. See assets.underdogfantasy.com/web/PlayandGetTerms_DFS_.html for details. 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)
