Sign up for a new daily fantasy sports account on Saturday, March 21, 2026, using the Underdog promo code TOPACTION to claim $50 in bonus entries for the March Madness Round of 32. The process is simple—enter a $5+ college basketball DFS lineup, and Underdog will award you $50 in bonus entries to use on future contests. Once registered, you can start building lineups right away using player projections from today’s Round of 32 games. Underdog remains one of the leading DFS apps in the U.S., with availability in most states. Click the sign-up module below to get started.
Underdog provides a strong alternative to online sports betting by focusing on player-based contests rather than spreads or totals. You’ll build entries based on player projections, and each additional pick increases your potential payout multiplier, allowing you to scale returns as you expand your March Madness Round of 32 lineup.
To see where the Underdog promo code TOPACTION is available, refer to the table below for a full list of eligible states.
| Underdog Promo Offer | DFS States Available | Underdog Promo Code Sign-Up Link |
|---|---|---|
| Play $5, Get $50 in Fantasy Bonus Entries | AL, AK, AR, CA, 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: Make Entry With CBB Picks Today
Sign up with the Underdog promo code TOPACTION, submit a $5+ entry, and unlock $50 in bonus entries that can be used on any picks from March Madness college basketball games in the Round of 32. Before locking in your lineup, it’s important to understand how Underdog entries function and how payouts are structured.
Underdog features two entry styles: Standard and Flex. A Standard entry requires a perfect lineup to cash but offers the highest upside. A Flex entry provides more flexibility, allowing one miss while still returning a smaller payout compared to a perfect Standard hit.
Here’s an example of a $5 Standard entry featuring CBB DFS picks for the Round of 32, with a 5x payout multiplier if all selections hit:
- Aday Mara Higher Than 7.5 Rebounds
- Kingston Flemings Lower Than 5.5 Assists
- Cayden Boozer Higher Than 13.5 Points
Here’s how the entry payout works depending on the results of your picks:
- If all picks win: You receive $25 total ($20 profit + $5 entry returned) along with $50 in bonus entries.
- If one or more picks lose: You still receive $50 in bonus entries.
The Underdog promo code TOPACTION is currently available to new users in the following states: AL, AK, AR, CA, DC, FL, GA, IL, IN, KS, ME, MS, MN, NE, NM, NC, ND, OK, OR, RI, SC, SD, TX, VT, VA, UT, WI, and WY.
Underdog Registration Steps: March Madness Round of 32
Follow the steps below to claim your $50 bonus with the Underdog promo code TOPACTION:
- Click the registration link or use a sign-up module to download the Underdog app.
- Create your username and password.
- Enter your email, date of birth, and required personal information.
- Input the Underdog promo code TOPACTION at the appropriate stage.
- Agree to the Terms of Use and Privacy Policy.
- Complete registration and deposit $10+ into your new account.
- Build your $5 first entry using March Madness CBB picks from the Round of 32 games. You get $50 in fantasy bonus entries, win or lose.
Underdog 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. 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; AZ: 1-800-NEXT-STEP (1-800-639-8783) or text NEXT-STEP to 53342; NY: Call the 24/7 HOPEline at 1-877-8-HOPENY or Text HOPENY (467369).
