The sports calendar is busy this time of year with two ranked college basketball matchups on the ESPN schedule today and the upcoming Patriots vs. Seahawks Super Bowl LX. New players can unlock an exceptional DFS welcome offer with Underdog promo code TOPACTION.
Now is a perfect time to join Underdog and place a $5 fantasy entry on the Monday NCAAB schedule, such as Louisville vs. Duke at 7 p.m. ET on ESPN. After you place this $5 first entry, you unlock $75 in fantasy bonus entries to use on more college basketball action, the upcoming Super Bowl, or any sport you prefer.
Underdog Promo Code Overview
A straightfoward bonus works best when you already have a slate in mind, and the Underdog promo code TOPACTION fits that moment. You can turn a small play into extra Fantasy Bonus Entries without overcommitting your deposited funds, which keeps the decision simple when the schedule gets busy.
Timing matters with a loaded ESPN NCAAB schedule on Monday, Jan. 26, 2026 and the upcoming Seahawks vs. Patriots Super Bowl.
How to Claim the Underdog Promo Code
If I place a $5 entry on Louisville vs. Duke predictions tonight, I have the chance to win cash if my entry is successful. In addition, after I meet Underdog’s requirements and enter the Underdog promo code TOPACTION where prompted, the Fantasy Bonus Entries piece is a fixed amount and does not change based on whether my $5 entry wins or loses.
This is one of the most valuable DFS welcome offers just in time for a loaded NCAAB slate on Monday and the upcoming Super Bowl.
Example: $5 entry → $75 bonus
Put real numbers on it: you play $5, then Underdog credits $75 Fantasy Bonus Entries when you register a new account with the Underdog promo code TOPACTION and meet the operator’s requirements.
If you are located in a legal, sports betting state, access thousands more in total bonus value from the best sportsbooks on the market before Monday tip-off.
How to Sign Up for Underdog Promo Code TOPACTION
- Confirm you are 21+ and located where Underdog is available, then open the Underdog app or website with this link. Start a new account registration with your legal name and contact info.
- During sign-up, find the promo code field and enter the Underdog promo code TOPACTION exactly, then double-check it before you submit so the system can attach the offer to your profile.
- Complete any required account verification steps Underdog prompts (identity and location checks can vary by state).
- Make your first $5 play inside Underdog, keeping your entry simple so you can track what happens next.
- After your $5 play, check your account for the $75 in Fantasy Bonus Entries and use them before they expire.
Terms & Conditions
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, NJ, 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).
