Unlock $50 in bonus cash today with the Underdog promo code TOPACTION. Sign up now and place a $5 lineup using picks from any sport, including college football. Regardless of your lineup outcome, you get $50 in bonus cash, which expires after 14 days.
To claim your welcome bonus, click the sign-up module below or enter the Underdog promo code TOPACTION. Use this sign-up offer in the following states: AL, AK, AR, 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.
Use Underdog Promo Code TOPACTION for NCAAF Lineup Now
Celebrate the start of the 2025 college football season by diving into the action with Underdog Fantasy. Once you unlock your welcome bonus using the Underdog promo code TOPACTION, you're ready to build your lineup. Choose "Higher" or "Lower" on player projections to add them to your lineup, which consists of two and six picks.
I've created an example lineup featuring picks from these matchups: Iowa State vs. Kansas State (12 p.m. ET on ESPN), Fresno State vs. Kansas (6:30 p.m. ET on FOX), and Stanford vs. Hawaii (7:30 p.m. ET on CBS).
If your lineup features three or more picks, choose between the Standard and Flex options. A Standard entry offers a 6x payout for winning every pick, while the Flex entry provides a 3x payout for a perfect entry or a 1x payout with a 2-for-3 entry.
Don't miss out on $50 in bonus cash with the Underdog promo code TOPACTION. Submit a $5 lineup using NCAAF picks to unlock your bonus cash, win or lose.
- Avery Johnson (Kansas State Wildcats) Higher Than 203.5 Passing Yards
- Jalon Daniels (Kansas Jayhawks) Lower Than 34.5 Rushing Yards
- Nick Cenacle (Hawaii Rainbows) Higher Than 74.5 Receiving Yards
How to Sign Up for Underdog Fantasy on Saturday, August 23, 2025
Follow the steps below to claim the Underdog promo code TOPACTION and make your first deposit and lineup on Saturday:
- 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 for a play $5, get $50 in bonus cash 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+.
- Step 8: Create your first entry at Underdog Fantasy with picks from college football or any other sport.
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, 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)