With March Madness officially underway, the Underdog promo code TOPACTION is your ticket to the action. 32 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.
Underdog Fantasy is available in multiple states, including 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 and deposited funds, browse Underdog Fantasy’s pick’em section for player projections from games like Creighton vs. Louisville and VCU vs. BYU. Available categories include points, rebounds, assists, steals, and combined stats like points + rebounds + assists. Your goal 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:
- Chucky Hepburn (Louisville) – Lower than 16.5 points
- Ryan Kalkbrenner (Creighton) – Higher than 8.5 rebounds
- Jack Clark (VCU) – Higher than 16.5 points + rebounds
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 64 tipping off today, now is the perfect time to sign up for one of the best March Madness betting promos.
Underdog Sign-Up Steps for March Madness
Follow the steps below to claim the Underdog promo code TOPACTION and make your first deposit on Thursday:
- Step 1: Click this link or any sign-up module on this page to download the Underdog Fantasy 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 Fantasy account.
- Step 4: Enter the 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 sport.
Must be 18+ (19+ or 21+ depending on state of residence) and within applicable state. Full T&Cs apply