When you register today with the Underdog promo code TOPACTION, claim one of the best DFS sign-up bonuses. Underdog Fantasy is one of the top DFS operators in the industry at the moment, and when you sign up with the Underdog promo code TOPACTION, you receive a 50% deposit match of up to $1K in bonus cash. Use the bonus cash you get with this welcome offer to place entries containing picks from any sport, including MLB.
The Underdog promo code TOPACTION provides a 50% match on your first deposit for up to $1K in bonus cash. As a result, you must make an initial deposit of $2K or more to claim the maximum bonus. At Underdog Fantasy, you create entries instead of placing sports bets, making the platform one of the best alternatives to online sports betting. This is especially true in the U.S. states where online sports betting is not legal yet, given that Underdog Fantasy is legal in most states.
New users in Alabama and Minnesota receive a different sign-up offer. Play $5+ in entries and draft contests at Underdog Fantasy now to get $50 in bonus cash. When you register with the Underdog Fantasy promo code TOPACTION in Georgia and Utah, you get both the $1K deposit match and the $50 play-through bonus offer.
| Underdog Fantasy Promo | States Available | Underdog Promo Code Sign-Up Link |
|---|---|---|
| Get Up to $1K Bonus Cash When You Make Your First Deposit | AK, AR, FL, IL, IN, KS, ME, MS, NE, NM, NY, NC, ND, OK, OR, RI, SC, SD, TX, VT, VA, WI, WY, DC | TOPACTION |
| Deposit Match Up to $1000 + Play $5, Get $50 | GA, UT | TOPACTION |
| Play $5, Get $50 | AL, MN | TOPACTION |
Underdog Fantasy Promo Code TOPACTION: Place MLB Entries Now
Let's break down how the sign-up offer available with the Underdog promo code TOPACTION works now. Remember, you receive a 50% deposit match of up to $1K in bonus cash. Suppose I register and make my first deposit for $1K. The 50% match rate unlocks $500 in bonus cash that is placed into a separate bonus balance from my deposited cash balance.
Now that I have my bonus cash in tow, let's look at how entries work at Underdog Fantasy. There are two different ways to place entries: Standard or Flex. A Standard entry provides a larger payout than a Flex, but you only receive it for going perfect. With a Flex, you receive a smaller payout if you win all of your picks or lose just one.
Here is a look at an example of my first entry with the Underdog promo code TOPACTION:
- Brandon Woodruff HIGHER than 6.5 Strikeouts
- Hunter Greene HIGHER than 5.5 Strikeouts
- Shohei Ohtani HIGHER than 4.5 Strikeouts
Suppose I place this entry as a Standard for $10, which has a 5.5x payout multiplier. If all picks win, I receive a $55 total payout that includes $45 in profit and my $10 entry back. Remember to use the Underdog promo code TOPACTION to secure your offer. If I use bonus cash to place this entry, I do not receive the $10 entry amount back. Any winnings are added to my cash balance.
How to Claim Your Underdog Promo: Wednesday, August 13, 2025
Follow the steps outlined below to claim your welcome offer with the Underdog promo code TOPACTION:
- Step 1: Click this link or any sign-up module on this page to download the Underdog 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 account.
- Step 4: Enter the Underdog promo code TOPACTION to get up to $1,000 in bonus cash from the 50% deposit match welcome offer.
- Step 5: Agree to the Underdog 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+.
- Step 8: Create your first entry at Underdog.
Must be 18+ (19+ or 21+ depending on state of residence) and within applicable state. Full T&Cs apply.
Must be 18+ and present in Georgia or Utah. Terms apply. See underdogfantasy.com/web/deposit-match-terms and https://assets.underdogfantasy.com/web/play_get.html for details. Concerned with your play? Call 1-800-GAMBLER or visit www.ncpgambling.org.
Must be 18+ (19+ in AL) and present in Minnesota or Alabama. Terms apply. See https://assets.underdogfantasy.com/web/play_get.html for details. Concerned with your play? Call 1-800-GAMBLER or visit www.ncpgambling.org.