Sign up with the Underdog promo code TOPACTION to secure a $100 welcome offer for tonight's Thursday Night Football tilt between the Buffalo Bills and Houston Texans.
All you have to do is submit a $5+ entry once you register with the Underdog promo code TOPACTION and receive $100 in bonus entries, no matter how your initial play performs. Your bonus entries are delivered in 10 separate $10 increments, giving you multiple chances to get in on the action.
Underdog Fantasy operates legally in most U.S. states, including many where online sports betting hasn’t launched yet. That makes the Underdog Fantasy promo code TOPACTION one of the best alternatives to traditional sports betting bonuses. It's perfect for attacking tonight’s matchup between two teams fighting for playoff spots on Amazon Prime* 8:15 p.m. EST kickoff). Review the chart below for full details concerning which states have access to Underdog.
| Underdog Promo Offer | DFS States Available | Underdog Promo Code Sign-Up Link |
|---|---|---|
| Play $5, Get $100 in Bonus 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: Unlock $100 Bonus Entries for Bills vs. Texans Tonight
Sign up with the Underdog promo code TOPACTION to secure $100 in bonus entries for tonight's Buffalo Bills-Houston Texans game in Houston. All you need to do is submit a $5+ entry at Underdog Fantasy, and you’ll automatically receive $100 in bonus entries. Your bonus will arrive in 10 separate $10 increments, and none of the bonus entries come with an expiration date.
Underdog Fantasy offers two types of entries: Standard and Flex. Standard entries require every pick to hit for the full payout, delivering the highest return. Flex entries provide a safety net by allowing one missed pick, though the payouts are smaller when you sweep the board. Standard entries reward risk; Flex entries reward stability.
Here’s an example of an entry I built for tonight’s Bills-Texans game.
- Josh Allen Lower Than 33.5 Rushing Yards
- Gabe Davis Lower Than 26.5 Receiving Yards
- Davis Mills Higher Than 1.5 Passing TDs
Let’s say I submit this entry as my initial $5 play using the Underdog promo code TOPACTION, and it carries an 8x payout multiplier. Here’s what I’d receive depending on how the picks perform:
- If all of my selections hit: I earn a $40 total payout ($35 profit + my $5 entry returned) plus $100 in bonus entries.
- If any pick loses: I still receive $100 in bonus entries, regardless of the outcome.
Underdog Fantasy Promo Code Sign-Up Steps: Thursday, November 20, 2025
Follow the steps below to claim your $100 bonus with the Underdog Fantasy promo code TOPACTION:
- Click this link or any sign-up module on this page to download the Underdog Fantasy app.
- Create a username and password.
- Enter your email, date of birth, and other required personal information to set up your new Underdog account.
- Input the Underdog promo code TOPACTION and submit a $5+ entry to unlock $100 in bonus entries.
- Agree to the Underdog Terms of Use and Privacy Policy.
- Click “Sign Up.”
- Make your first deposit of $10 or more.
- Build your first entry using picks from Bills-Texans tonight.
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).
