Underdog

Underdog started out in 2020 as a Best Ball and Pick'em app. Since July 2026 it has run a sports prediction market on its own exchange, Underdog Exchange (UDX), regulated by the Commodity Futures Trading Commission, and it has since added Rips, digital card packs tied to real trading cards. Contracts, fantasy contests and card packs now share one account.

This review covers the two welcome offers on code GETOFFER, how the prediction markets and Rips work, banking, and where you can use the app.

Underdog review

New customers: Use Code GETOFFER: Play $10, Get $50 in Bonus Entries

• Enter code GETOFFER when you sign up, or open the account through the link and the code is filled in for you.
• Underdog shows new users a choice of welcome offers. You keep one, and once you pick it you cannot switch.
• Play $10, Get $50: deposit at least $10 and place a qualifying $10 entry (draft entries do not count). Win or lose, $50 in bonus entries follows once the entry's cancel window closes.
• The $50 may arrive all at once or in daily installments. An installment can expire 24 hours after it lands, so use each one the day you get it.
• Bonus entries are for fantasy contests (Pick'em and Drafts), need a 1x playthrough and only go on entries that pay 2x or more. They cannot be spent directly on prediction picks, though they can fund the fantasy leg of a combo.
• 5 free Rips packs: play $5 instead and take five Rips packs worth up to $750 in total. The $750 is the most the cards could be worth, not cash, and every pull is random.
• Must be 18+ (19+ in Alabama and Nebraska, 19+ in Colorado for some games, 21+ in Arizona, Massachusetts and Virginia) and present in a state where Underdog operates. New customers only.

Click HERE to claim the Underdog welcome offer

Underdog best features

Underdog now has an exchange and card packs next to the fantasy games it started with.

Prediction markets on Underdog's own exchange

Every market is a contract priced between 1 cent and $1, and the price is the probability. A contract at 63 cents means the market gives that outcome about a 63% chance. If you are right, each contract pays $1. You can sell before the game ends when cash out is offered.

Rips card packs

Each Rips pack is linked to one real card, either an authenticated card or a slab graded by PSA, BGS, CGC or SGC, already sitting in a vault. Packs run from $5 to $2,500, and the odds for every value tier are on the pack page before you open it. Some sports packs also have a Toss Up mode with straight 50/50 odds. Rips lives in the iOS and Android apps, not the web app.

What happens after you open a pack

Every pull gets a fair market value based on recent sales of the same card, and Underdog will buy it back at 100% of that figure. The quote holds for three days and does not drop. In that window you can have the card shipped for the vault's shipping fee, with nothing added by Underdog, or leave it in your Card Stash. Do nothing and it is sold back at the quoted price.

Combos, Pick'em and Drafts

You can put a team outcome and a fantasy player pick on the same entry where both products are live. Pick'em pays fixed multipliers on player projections, and Drafts cover daily slates and Best Ball. Once you have joined Underdog, the lobby only shows the modes that are live in your state.

Keep Your Million

Underdog hands every new user a virtual $1,000,000 and 20 higher-or-lower questions. Whatever is left after all 20 is yours in bonus funds, and you can play it whichever welcome offer you choose.

Pros and cons of Underdog

Most new users will care about the offer choice and the card packs, so both show up here.

Pros

✅ $50 in bonus entries from one $10 play with code GETOFFER

✅ Five Rips packs worth up to $750 instead, if cards are more your thing

✅ Prediction markets on a CFTC-regulated exchange that Underdog owns outright

✅ Rips pulls are real graded or authenticated cards you can have shipped home

✅ 4.8 stars from more than 327,000 App Store ratings

Cons

❌ You get one welcome offer, so pick the one that suits how you play

❌ Daily installments can expire after 24 hours, so check in each day

How to get started with Underdog

1. Click HERE to open your Underdog account with code GETOFFER.
2. Enter an email address, a password and a username, and check that GETOFFER sits in the promo code field.
3. Add your name, address, date of birth and the last four digits of your SSN so Underdog can verify you.
4. Download the iOS or Android app. The web app works too, but Rips needs the app.
5. Choose your welcome offer: Play $10, Get $50 or the five Rips packs.
6. Deposit at least $10 by debit card, Apple Pay or Trustly bank transfer.
7. Place your qualifying entry, then use your bonus entries or rip your packs, and trade your first contract.

What can you trade on with Underdog?

The markets below open up once you have signed up.

Moneylines: Buy the contract on the team you think wins, priced at its implied probability.

Spreads: Contracts on whether a side covers the line, with alternate numbers available.

Totals: Higher or lower on the combined score, settled yes or no at the final whistle.

Player picks: Contracts on an individual stat line, or Pick'em projections where fantasy contests are live.

Combos and parlays: Stack a team outcome with player picks on one entry, or build a prediction parlay across games.

Sports covered by Underdog

Football leads in the fall, with the NBA, NHL and the rest filling the schedule around it.

• Baseball
• Basketball
• College basketball
• College football
• Esports
• Football
• Golf
• Hockey
• MMA
• Soccer
• Tennis
• WNBA

Banking at Underdog

Deposit from $10 by Trustly online banking, debit or credit card (Visa, Mastercard, Amex), Apple Pay, Google Pay, PayPal or Venmo after you register. Prediction picks can only be funded by card, Apple Pay or Trustly, so start with one of those if you plan to trade.

Withdrawals go back to PayPal, Trustly, Venmo, Paysafe, Apple Pay or a debit card you have deposited with, and start at $10. Underdog processes requests within 48 to 72 hours. Rips buybacks are paid into your Underdog balance, and bonus entries cannot be withdrawn.

Where is Underdog available?

Some part of Underdog is live in every state and DC except Nevada. Prediction markets run in 46 states and DC because the exchange is regulated federally, and the app checks your location every time you trade. Pick'em and Drafts run in 33 states and DC, and Rips is open everywhere but Nevada. Arizona, Michigan and New York have no prediction picks: Arizona has Pick'em, Drafts and Rips, New York has Drafts and Rips, and Michigan has Rips. State court cases over sports contracts can change what you see.

• Nevada

Sign up here to get started.

FAQs

Can I use Underdog on my phone and my computer?

Yes. There are iPhone and Android apps and a web app, and the same account and balance work on all three. Rips is the exception and only runs in the apps.

Is Underdog safe and regulated?

Yes. The prediction markets trade on Underdog Exchange, which the CFTC regulates, and fantasy contests are licensed state by state. The app also has deposit limits, cool-off periods and self-exclusion.

Do I pay tax on my winnings?

Yes. Winnings from contracts and contests are taxable income in the United States. Ask a tax professional if you are unsure.

How old do I need to be?

You must be 18 or older for prediction picks and be physically in an eligible state. The app-wide minimum is 19 in Alabama and Nebraska, 19 in Colorado for some games, and 21 in Arizona, Massachusetts and Virginia.

How fast are payouts?

Underdog processes withdrawals within 48 to 72 hours. PayPal usually lands about two days later, and Trustly can take up to three business days.

Are the cards in Rips packs real?

Yes. Every pack is tied to a physical card held in a vault, and you can have it shipped to you within three days of opening the pack. Domestic deliveries usually take one to three weeks, depending on which vault holds the card. Ready to go? Click here to claim Use Code GETOFFER: Play $10, Get $50 in Bonus Entries.

18+. Trading involves risk, including total loss on positions. Trading decisions and their consequences are your sole responsibility. Nothing on underdogexchange.com constitutes a recommendation, solicitation, or offer to buy or sell any financial instrument. UDX is subject to CFTC regulatory oversight. Promotion issued by affiliate. Content is promotional and not a recommendation to trade. Terms apply. Please trade responsibly. Call 1-800-MY-RESET or visit www.ncpgambling.org; AZ: 1-800-NEXT-STEP (1-800-639-8783) or text NEXT-STEP to 53342; NC: Gambling Problem? Call 1-877-718-5543, visit morethanagame.nc.gov, or call 1-800-GAMBLER; NY: Call the 24/7 HOPEline at 1-877-8-HOPENY or Text HOPENY (467369). MD: Please play responsibly. For help dial 1-800-GAMBLER or visit mdgamblinghelp.org. CO: Gambling problem? Call or TEXT 1-800-GAMBLER. PA: If you or someone you know has a gambling problem, help is available. Call (1-800-GAMBLER).