What Underdog Fantasy Is
Underdog launched in 2020 with a simple thesis: drafting is the most fun part of fantasy sports, so build a platform around it and skip the weekly grind. Six years later, that thesis has paid off — Underdog hosts Best Ball Mania, a $15 million fantasy football tournament, and has become the platform of choice for traditional fantasy players who want to compete for real money without running a full season-long ESPN league.
Its app now covers Drafts (snake-style, including Best Ball), Pick'em (higher/lower player props, including Pick'em Champions tournaments), and Prediction Picks (event contracts, including on its own exchange, UDX), plus extras like Streaks. Drafts are the flagship product.
How Underdog Drafts Work
The signature format is best-ball. Here's how it works:
- You join a draft room — 12 drafters in Best Ball Mania, while other contests run 12-, 6- or other-size rooms.
- You take turns picking real NFL or NBA players in a snake draft (round 1 goes 1–12, round 2 reverses 12–1, and so on).
- Once the draft is over, you're done. The platform automatically starts your highest-scoring players each week — no lineup decisions required.
- Your team accumulates points across the regular season. Top teams advance through playoff rounds in tournament-style contests.
This is the killer feature for casual players. There's no weekly lineup management. No "should I start Mahomes against this defense" decision Tuesday night. You draft once and watch the season play out.
Best Ball Mania: The Marquee Event
Best Ball Mania is Underdog's flagship tournament and one of the largest in fantasy football. The 2025 edition (Best Ball Mania VI) ran a $15 million guaranteed prize pool with a $25 entry and a $2 million top prize. The 2026 edition (Best Ball Mania VII) kept the same $15 million pool and $2 million top prize across 672,336 entries.
The tournament structure: 56,028 twelve-person drafts play out Weeks 1–14, and the top two in each group advance. Weeks 15 and 16 are single-week rounds where only group winners move on, and a 667-team final is decided in Week 17.
Even if you don't enter the headline tournament, smaller best-ball contests (under $20 entry) run continuously throughout the spring and summer leading into the NFL season.
How Pick'em Works on Underdog
Underdog also runs a pick'em product similar to PrizePicks: pick 2–8 players to go higher or lower on their stat projections, and get a multiplier on your entry if they all hit (3.5x for 2 picks up to 120x for 8). Pick'em is available in slightly fewer places than Drafts — New York, for example, has Drafts but not Pick'em. If pick'em isn't available in your state, you'll see Drafts as the main option.
The Bonus, Honestly
Underdog's current signup offer is a 50% deposit match up to $1,000 in bonus funds, plus a free entry into Keep Your Million, its 20-question survival game. The bonus is redeemed on pick'em plays, needs a $10 minimum deposit, and has a 14-day playthrough window. It isn't valid in Maryland, Michigan, New Jersey, New York, Ohio or Pennsylvania. The offer rotates by promo code — Underdog's own homepage has also run "Play $5, Get $50" — so check the exact terms on the signup screen.
Bonus mechanics:
- Bonus funds are credited as non-withdrawable bonus funds that can be used to enter contests but not withdrawn.
- Both your deposit and the match must be played through within 14 days, or the bonus is forfeited; bonus entries can't be used on picks paying under 2x.
- Promotional terms vary — always read the offer's fine print for playthrough requirements and expiration.
Sports Coverage
Underdog skews toward the major North American sports:
- NFL — the platform's identity. Best Ball Mania is the marquee.
- NBA — both drafts and pick'em (in eligible states)
- MLB — drafts and pick'em throughout the season
- NHL — drafts and pick'em
- MMA — pick'em
- College football and college basketball — drafts during their seasons
Underdog has also branched out: pick'em covers golf, NASCAR, soccer, tennis, and esports, and there are golf and soccer drafts. Its heart is still the major team sports; if you want classic salary-cap lineups in golf or motorsports, check DraftKings.
The App and Overall UX
Underdog's mobile app is one of the best-designed in DFS. It feels less crowded than DraftKings and more focused than FanDuel — the core is still Drafts and Pick'em (with Prediction Picks now added), and the app makes each easy to find.
Highlights:
- Draft interface. The live drafting experience is the best in the industry — fast, clean, with player ADP and recent picks always visible.
- Live tracking during NFL games. Watching a best-ball roster auto-optimize in real time on Sunday is genuinely exciting.
- Onboarding. First-time draft tutorial walks you through how scoring and pick rounds work without being condescending.
Trade-off: because the app is built around drafts and pick'em, it doesn't offer DraftKings-style salary-cap lineups (its one salary-cap format is a snake-draft Battle Royale). If you want both, you'll have a separate DraftKings or FanDuel app on your phone.
Deposits, Withdrawals, and Fees
Deposits go through credit/debit card, Apple Pay, PayPal, Venmo, and Trustly bank link. Minimum deposit is $10.
Withdrawals go out via PayPal, Venmo, Trustly, or debit card, typically processed within 48–72 hours (bank transfers can take a few extra business days). There are no Underdog-side fees on withdrawals. Underdog requires a one-time ID verification on your account (and an SSN for tax forms or prediction markets).
Where Underdog Is Legal
Underdog Drafts (best-ball and snake drafts) are available in 34 U.S. states plus Washington, D.C. Underdog Pick'em is available in 33 states, and Prediction Picks reach 46 states plus D.C. Some states allow Drafts but not Pick'em (New York, for example).
Age requirements vary: most states are 18+, but Alabama and Nebraska are 19+ (Colorado is 19+ for some games), and Arizona, Massachusetts, and Virginia are 21+. Check the current state availability before depositing if you live in a regulatory edge case — Underdog's help center lists eligibility by product, and our legal states guide covers PrizePicks.
Pros and Cons
How Underdog Compares
| Feature | Underdog | PrizePicks | DraftKings |
|---|---|---|---|
| Signup Bonus | 50% match up to $1,000 | Play $5, get $150 in Bonus Lineups (if you win) | New-user offer (see current terms) |
| Format | Drafts, best-ball, pick'em | Player pick'em, plus team picks | Salary cap, Showdown |
| Lineup Management | None (best-ball) | None | Required weekly |
| Marquee Tournament | $15M Best Ball Mania | Daily Player Picks lineups | $20M NFL Best Ball Millionaire |
| States Available | 34 + DC (Drafts) | 36 + DC (Player Picks) | 44 |
| Best For | Draft lovers, NFL focus | Quick prop entries | Variety, big GPPs |
Who Should Sign Up for Underdog
Sign up if: you've played season-long fantasy and loved the draft but hated the weekly lineup grind. Or if you want a shot at Best Ball Mania's $15 million prize pool next season. Or if you want both drafts and pick'em on a single, well-designed platform.
Skip it if: you only care about traditional salary-cap DFS — DraftKings or FanDuel are better fits. Also check eligibility first: Underdog's fantasy games aren't offered in 16 states.
Frequently Asked Questions
Is Underdog Fantasy legit?
Yes. Underdog was founded in 2020, has more than 11 million registered accounts, and in July 2026 agreed to be acquired by IG Group for $1.1 billion upfront (closing expected late 2026 or early 2027, pending U.S. regulatory approval). Its prediction markets include event contracts on its own CFTC-regulated exchange, UDX.
What's the difference between best-ball and snake drafts?
Both use a snake-style draft. The difference is what happens after: in best-ball, the platform auto-starts your highest scorers each week — you do nothing. Underdog's daily drafts work the same way but cover a single slate, with quick 4-player lineups. For Best Ball Mania and most Underdog tournaments, it's best-ball.
How fast does Underdog pay out winnings?
Withdrawals via PayPal, Venmo, Trustly, or debit card are typically processed within 48–72 hours. There are no fees from Underdog on any withdrawal method.
Is the Underdog pick'em product the same as PrizePicks?
Mechanically, it's similar — pick 2–8 players to go higher or lower on their stat lines. Underdog uses its own multiplier table (3.5x for a 2-pick entry up to 120x for 8) and offers Flex entries. State availability also differs.
Can I play Underdog if I'm in a state where pick'em isn't legal?
Often yes — Drafts are available in more places than Pick'em. New York, for example, allows Underdog Drafts but not Pick'em. Check Underdog's site for your specific state.
Is the signup bonus really worth it?
Yes, if you'll play pick'em anyway. The current offer matches 50% of your deposit up to $1,000 (a $200 deposit adds $100 in bonus funds), but the bonus is used on pick'em entries and must be played through within 14 days. Read the terms before depositing big.