As we are now deep into March Madness, our Underdog promo code TOPACTION is your ticket to more of the basketball action. 16 teams are slated to be on the floor today, giving daily fantasy sports (DFS) players plenty of opportunities to build winning lineups. Whether you're backing a high-scoring guard, a dominant rebounder, or a key defensive playmaker, Underdog Fantasy lets you test your skills with player pick’em contests.
New users who sign up with the Underdog promo code TOPACTION receive a 50% deposit match bonus of up to $1,000. That means if you deposit $2,000, you get an extra $1,000 in bonus credits to use on Underdog Fantasy pick’em contests for college basketball, or any other sport that you choose.
Underdog Fantasy is available in many states: AL, AK, AZ, AR, CA, DC, DE, GA, IL, KS, KY, MA, MN, MO, NE, NM, NC, ND, OK, OR, RI, SC, SD, TN, TX, UT, VT, VA, WI, WV, and WY.
How to Use the Underdog Promo TOPACTION for March Madness
Once you've signed up at Underdog Fantasy and deposited your funds, browse their pick’em section for player projections from games like Baylor vs. Duke and Saint Mary's vs. Alabama. Available categories include points, rebounds, assists, steals, and combined stats like points + rebounds + assists. Your goal here is to predict whether a player is going to go over or under their projected total.
You can combine up to six picks in a single entry, with the potential to win up to 35x your wager. If your entry has at least three selections, you can choose between two play styles:
- Standard Entry: All picks must be correct to win up to 6x your wager.
- Flex Entry: A lower-risk option that still pays out even if one pick falls short—win 3x if all picks hit and 1x if one selection is incorrect.
Here’s a sample three-pick lineup built using Underdog promo code TOPACTION bonus funds for March Madness matchups:
- Cooper Flagg (Duke) – Higher than 19.5 points
- Mark Sears (Alabama) – Higher than 16.5 points
- Augustus Marciulionis (Saint Mary's) – Lower than 26.5 points + rebounds + assists
If you enter this lineup in Standard mode, you win 6x your wager amount if all three picks hit. Flex mode provides a 3x payout if all three selections win and still returns 1x if one pick misses.
With the Round of 32 finishing up today, now is the perfect time to sign up for one of the best March Madness betting promos.
Underdog Fantasy Sign-Up Steps for March Madness
Carefully follow our steps below to claim the Underdog promo code TOPACTION and make your first deposit on Sunday:
- Step 1: Click this link or any sign-up bonus offer on this page to download the Underdog Fantasy app.
- Step 2: Create your username and password.
- Step 3: Fill in your email, date of birth, and all other correct required personal information to create a new Underdog Fantasy account.
- Step 4: Enter our Underdog Fantasy promo code TOPACTION to get up to $1,000 in bonus funds from the 50% deposit match welcome offer.
- Step 5: Agree to the Underdog Fantasy Terms of Use and Privacy Policy. Confirm you are at least 18 years old (19+ in Alabama/Nebraska, 21+ in Massachusetts/Arizona).
- Step 6: Click "Sign Up."
- Step 7: Make your first deposit of $10+. It is matched at a 50% rate, up to $1,000 in bonus funds.
- Step 8: Create your first entry at Underdog Fantasy with picks from March Madness or any other sport.
Must be 18+ (19+ or 21+ depending on state of residence) and within applicable state. Full T&Cs apply