18+ (19+ in AL, NE; 21+ in AZ, MA, VA). Play a $5+ Best Ball entry to unlock $75 in bonus entries. Bonus entries expire 14 days after registration. Underdog Fantasy is not available in CT, HI, IA, ID, LA, ME, MT, NV, or WA. Welcome offer not valid in MD, MI, NJ, NY, OH, or PA. Must be physically located in an eligible US state to play. Gambling problem? Call or text 1-800-GAMBLER (1-800-426-2573). Chat available at ncpgambling.org/chat.
Underdog has become one of the most talked-about names in the U.S. fantasy sports space, especially among players who want a faster, more modern alternative to traditional sportsbooks and old-school daily fantasy contests.
Rather than focusing on a massive betting board packed with complicated markets, Underdog keeps things simple and engaging through pick’em-style entries, fantasy contests, and player projection games. That format has made it especially popular during major events such as March Madness, when college basketball fans want a more interactive way to follow the tournament.
If you’re thinking about joining, this guide covers everything you need to know about the Underdog welcome offer, how bonus entries work, the app experience, available contest types, payments, state availability, and whether the platform is worth trying.
Underdog Welcome Bonus
Welcome Offer: Play $5, Get $75 in Bonus Entries
New users can unlock Underdog’s introductory offer by signing up, making a qualifying deposit, and submitting their first eligible entry.
How the Offer Works
- Create an Underdog account
- Deposit at least $10
- Submit a qualifying entry of at least $5
- Once the entry is graded, receive $75 in Bonus Entries
This is a low-cost way to test the platform, especially for users who want to try NCAA tournament contests, player projection entries, or other featured games without committing too much upfront.
Understanding Underdog Bonus Entries
Unlike a standard sportsbook welcome bonus that may come as bonus bets or site credit, Underdog awards users Bonus Entries.
These bonus entries are promotional funds that can be used on eligible contests and pick’em-style entries across the platform. They are designed to give new users more chances to play after completing the initial requirements.
What Bonus Entries Mean
Bonus Entries
- Promotional entry funds credited after your first qualifying play is graded
- Can be used on eligible Underdog contests
- Typically subject to platform terms and expiry rules
Cash Deposit
- Your real deposited funds used to enter qualifying contests
- Required to unlock the welcome offer
This setup is straightforward: make your first qualifying play, wait for it to settle, and then use the bonus entries on other eligible games.
Pros and Cons
Before signing up, it helps to understand where Underdog stands out and where it may feel different from traditional sportsbooks.
Pros
- Simple Welcome Offer: Low barrier to entry with a $10 minimum deposit and $5 qualifying play
- Strong Mobile Experience: Clean app design on both iOS and Android
- Fast-Paced Format: Pick’em entries and fantasy contests are easy to understand
- Great for Big Events: Especially appealing during March Madness and other major sports periods
- Wide State Availability: Available in many U.S. states
Cons
- Not a Traditional Sportsbook: Users looking for standard moneylines, spreads, and totals may prefer a regulated sportsbook
- Bonus Comes as Entry Credits: Not the same as withdrawable cash
- State Rules Vary: Availability and contest formats can differ depending on location
- Promo Funds Expire: Bonus entries generally need to be used within the stated time limit
Underdog Overview & Background
Underdog has built its reputation by focusing on a mobile-first fantasy sports product that feels modern, fast, and highly shareable. Instead of overwhelming users with hundreds of betting options, the platform centers on player-focused entries and fantasy-style contests.
That approach has helped Underdog stand out with younger sports fans and casual players who want a simpler experience than what many traditional sportsbooks offer. It has also gained traction during major sporting events, including the NCAA Tournament, where player-based entries can add an extra layer of excitement to every game.
For many users, the appeal is clear: easy entry creation, a polished app, and a format that keeps the focus on player performances rather than just team results.
App & User Experience
Underdog is built for mobile and performs well on both iOS and Android. The app is one of the platform’s biggest strengths, with a smooth interface that makes it easy to browse contests, build entries, and manage your account.
Key Features
- Mobile-First Design: Fast navigation and clean layouts
- Pick’em Entries: Build entries around player projections and performance stats
- Fantasy Contests: Multiple contest formats for different player preferences
- Quick Account Setup: Registration and verification are relatively simple
- Intuitive Lobby: Featured contests are easy to find during major sporting events
The overall experience feels much more streamlined than many traditional betting apps. Users who want speed and simplicity will likely appreciate the layout.
Contest Types & Sports Coverage
Underdog is best known for fantasy-style contests and player projection games rather than full sportsbook betting markets.
Sports coverage can include major U.S. leagues and events such as:
- NFL
- NBA
- MLB
- NHL
- NCAA Basketball
- College Football
- Golf
- MMA
- Soccer
Popular entry formats often revolve around:
- Player projections
- Pick’em selections
- Daily fantasy contests
- Tournament-focused entries
- Special event contests
Pick’em Variants and Multipliers
Underdog runs Pick’em in two formats depending on state regulation. In most states, users play a traditional more/less projection game against the house. In states that pushed back on house-style pick’em, Underdog offers a peer-to-peer variant called Pick’em Champions, where users compete against each other rather than the platform.
Pick’em payouts run on a fixed multiplier scale: a 2-pick entry pays 3x for two correct, 3-pick pays 6x, 4-pick pays 10x, and a clean 5-pick entry pays 20x. Occasional promotional boosts push those rates higher during marquee events.
For March Madness in particular, Underdog gives college basketball fans a way to build entries around player stat lines and game performances instead of simply picking winners against the spread.
Promotions for Existing Users
While the new-user offer is the main attraction for first-time players, Underdog may also run ongoing promotions and featured contests for existing users.
These can include:
- Special tournament promos
- Boosted featured contests
- Seasonal campaigns around major sports events
- Referral incentives
- Limited-time entry rewards
Ongoing promotions can change frequently, so regular users often keep an eye on the app lobby for new featured offers.
Deposits & Withdrawals
To claim the welcome offer, users must make a deposit of at least $10 and complete a qualifying $5 play.
Deposits
- Minimum deposit for the offer: $10
- Users fund their account through the cashier section
- Payment options may vary by location and platform settings
Withdrawals
Withdrawal rules, timing, and eligibility depend on account verification and platform terms. As with most fantasy and gaming platforms, users should expect identity checks before cashing out.
It is always smart to verify your account details early, as this can help prevent delays later when requesting a withdrawal.
How to Claim the Underdog Welcome Offer
Claiming the bonus is fairly simple.
Step-by-Step
- Visit the Underdog site or app
- Select Sign Up
- Enter your details, including name, email, and login information
- Verify your account through the confirmation email
- Go to the cashier and deposit at least $10
- Submit a qualifying entry of at least $5
- Once that entry is graded, receive $75 in Bonus Entries
The process is beginner-friendly and should only take a few minutes to complete.
Legal States for Underdog
Underdog operates in around 40 US jurisdictions (states plus Washington, D.C.), though which products you can access depends on state regulations, and eligibility rules shift as legislatures act.
Available states include Alabama, Alaska, Arizona, Arkansas, California, Colorado, Washington D.C., Delaware, Florida, Georgia, Illinois, Indiana, Kansas, Kentucky, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, West Virginia, Wisconsin, and Wyoming.
Underdog is unavailable entirely in Connecticut, Hawaii, Idaho, Iowa, Louisiana, Maine, Montana, Nevada, and Washington due to state-level DFS regulations. In a handful of additional states (Maryland, Michigan, New Jersey, New York, Ohio, and Pennsylvania), Underdog products are available but the welcome offer does not apply.
Because rules can change and contest availability may differ by state, users should always confirm eligibility directly on the platform before signing up.
Responsible Gaming & Safety
Underdog includes standard safeguards designed to support safer play.
These may include:
- Age verification
- Geolocation checks
- Identity verification
- Account monitoring
- Responsible gaming messaging
Minimum age rules vary by state:
- 18+ in most eligible states
- 19+ in Alabama and Nebraska
- 19+ in Colorado for some games
- 21+ in Arizona, Massachusetts, and Virginia
Users should check the exact rules that apply in their location before entering contests.
Underdog vs Traditional Sportsbooks
| Feature | Underdog | Traditional Sportsbooks |
|---|---|---|
| Main Format | Fantasy contests and player projections | Standard sports betting |
| Focus | Player performance entries | Team and event betting markets |
| Welcome Bonus | Bonus entries | Bonus bets or site credit |
| App Experience | Very streamlined and mobile-first | Varies by operator |
| March Madness Appeal | Strong for player-based entries | Strong for spreads, totals, moneylines |
| Availability | Broad, but format varies by state | Only in licensed sportsbook states |
Underdog is a better fit for users who enjoy player-focused gameplay and a cleaner fantasy-style experience. Traditional sportsbooks remain stronger for bettors who want full market depth and conventional wager types.
Verdict: Is Underdog Worth It?
Yes. Especially for users who enjoy fantasy-style sports gaming, player projection entries, and major event contests like March Madness.
The Play $5, Get $75 in Bonus Entries offer is easy to understand and doesn’t require a large upfront commitment. That makes it a solid starting point for new users who want to test the app and explore how Underdog works.
It may not replace a traditional sportsbook for everyone, particularly for bettors who want classic lines and bigger market depth. But for players who value simplicity, mobile usability, and player-based contest formats, Underdog is a strong option.
Underdog Rating: 4.3 / 5
A polished and engaging fantasy platform with a beginner-friendly welcome offer, strong mobile design, and broad appeal during major sports events.
Underdog FAQs
New users can qualify for a Play $5, Get $75 in Bonus Entries promotion after signing up, depositing at least $10, and submitting a qualifying $5 entry.
Bonus entries are promotional funds credited after your first qualifying entry is graded. They can be used on eligible contests on the platform.
The minimum deposit is $10.
You need to submit a qualifying entry of at least $5.
No. Underdog is better described as a fantasy sports and player projection platform rather than a conventional sportsbook.
Yes. Underdog has mobile apps available on iOS and Android, and the platform is designed with a strong mobile-first experience.
Yes. Underdog is especially appealing during March Madness because users can build entries around player projections and performance stats throughout the NCAA Tournament.
Bonus entries expire 14 days after registration, though users should always confirm the latest terms on the platform.
Underdog is available in many U.S. states, but legality and contest availability depend on location. Users must also meet the age requirement in their state.
Underdog is best for users who prefer simple, player-focused entries and fantasy-style contests rather than traditional sportsbook betting markets.