Underdog Promo Code GRINDERS: Play $5, Get $100

by Dylan Wilkerson (dwilkerson) Last Updated 2026-10-05T12:37:14
✅ Fact checked by Pablo Capris

Updated on 10/6/26

Underdog

Play $5, Get $100!

Bonus Code

GRINDERS

Claim $100

Must be 18+ (19+ in AL, NE; 19+ in CO for some games; 21+ in AZ & VA) and present in a state where Underdog Fantasy operates. Terms apply. Concerned with your play? Call 1-800-MY-RESET or 1-800-GAMBLER or visit www.ncpgambling.org; NY: Call the 24/7 HOPEline at 1-877-8-HOPENY or Text HOPENY (467369).

Use our Underdog promo code GRINDERS to get $100 after you deposit at least $10 and enter $5 in an eligible contest.

With football season underway, Underdog provides users with a one-stop shop to play one of their many formats, all in one app. Whether you want to trade on team results powered by their prediction markets, play draft-style fantasy games, or rip virtual packs for sports cards, Underdog has it all for you and me. Use our Underdog promo code GRINDERS now to unlock a bonus when you sign up.

Which contest types you see depends on your state, and your profile address needs to match where you actually are — a mismatch can block a deposit or stop the bonus from crediting.

Underdog Promo Code GRINDERS for October 2026

The best Underdog promo code is GRINDERS. Enter this code at signup, and Play $5, Get $100!

Underdog promo code GRINDERS is ONLY for new users. It runs in 40 states plus Washington, D.C., listed in the promo table above.

My Experience With the Underdog Promo Code GRINDERS

I used the Underdog promo code GRINDERS first hand and my experience was great. I decided to sign up for the app to take advantage of this offer. After submitting my information required to sign up like my username and password, I was then prompted to link a payment account to deposit. I decided to link my bank account. After I linked my bank account with Underdog, I had a decision to make. How much do I want to deposit?

Underdog promo code GRINDERS allows me to Play $5, Get $100! I deposited, entered a $5 contest, and the $100 landed once it settled. From there I used it across team and player outcomes and a few NFL best ball drafts.

I found that Underdog’s app and web interface is the most intuitive for everyone. It is a sleek design and offers a prediction market product without the confusing order books and limit orders. Want to trade on an outcome? I found that it was very easy to simply look at the percentage next to a team, tap the outcome, and trade the outcome.

This simplicity is not limited to team outcomes. Want to trade on player outcomes? That is also powered by the prediction market exchange. This allows a lot of access to a lot of users across the state. Anything I wanted to trade on I was able to find and place the trade with no hassle.

They also have the best drafting product available. They have a plethora of drafts available amongst a range of sports. I love best ball, specifically PGA Tour best ball and MLB playoff best ball. All of these were available and had an interface that is very easy to use.

How Does the Underdog Welcome Bonus Work?

Easy! When you sign up using the Underdog promo code GRINDERS, you’ll get the best value offer for new players: Play $5, Get $100!

Deposit at least $10, enter $5 or more in an eligible contest, and Underdog credits $100 once that entry settles. You don’t need to win it.

Trading involves risk, including total loss on positions. Content is promotional and not a recommendation to trade. Promotion issued by affiliate. Terms apply.

How to Use the Underdog Promo Code

The Underdog promo code GRINDERS is super easy to claim.

1. Use the links on this page to go to the Underdog site or app.
2. Enter the Underdog promo code GRINDERS, if it didn’t auto-fill.
3. Complete your registration and verify your account.
4. Deposit at least $10.
5. Enter $5 or more in an eligible contest.
The $100 lands once that entry settles. You don’t have to win it, but you do have to wait for it to finish.

From there you can build Pick’em entries, join drafts, or try whatever contest types are live in your state.

Underdog Promo vs Other Prediction Market Promos

Underdog isn’t the only DFS app offering a welcome bonus, but $100 off a $5 entry is the highest multiple on this list.

The difference is what you have to put up. Polymarket wants a $10 deposit for $50. Kalshi and ProphetX both want $25 or more in trades. Underdog asks for a $5 entry and returns $100, which is the best ratio here by a distance.

Where the others have an edge is flexibility: a trading bonus can go on any contract, while Underdog’s credit is tied to eligible fantasy contests.

What Products Does Underdog Offer?

Underdog has evolved since it came onto the scene at the forefront of the daily fantasy space. What was once reserved for drafts has evolved into a prediction-market behemoth allowing users to trade on the outcomes of sporting events within the app. Here are the products Underdog offers, all in its app.

• Underdog Predict: This product allows users to trade on the outcomes of sporting events including player props, the total score of the game, the spread, and who will win the game. This is an enticing interface for users wanting to trade on games but are skeptical of technical platforms like Kalshi and Polymarket. This is my personal favorite out of Underdog’s products as it allows users to trade on both player and team outcomes with a design and UX that is not intimidating to someone without traditional prediction market experience.
• Underdog Drafts: This is one of Underdog’s legacy products. Underdog offers drafts to users in select states including but not limited to best ball, daily slates, and playoff best ball.
• Underdog Rips: Underdog has recently unleashed a new product called Underdog Rips, where users can purchase packs of sports cards in the app and keep them digitally, sell them instantly, or have them shipped to you. Odds, prices, and total value are listed before you open a pack so you know exactly what you are getting.

What the GRINDERS Offer Actually Gives You

• Low barrier: a $10 deposit and a $5 entry is the whole qualification. Most DFS welcome offers want more up front.
• You don’t have to win: the $100 arrives once the entry settles, whatever the result.
• The catch is timing: you wait for the contest to finish rather than getting credited at deposit.
• Verified: we re-check the GRINDERS code on each update, and it applied cleanly on both iOS and desktop signup at our last test.

Underdog Goes Live with Prediction Markets

On July 18, 2026, Underdog launched its own CFTC-licensed exchange, cutting out the third-party partners it had been routing trades through — Crypto.com and Kalshi — since becoming the first sports gaming operator to offer prediction market access in September 2025.

The backend build moved quickly. On March 9, 2026, Underdog announced the purchase of Aristotle Exchange DCM, Inc. and Aristotle Exchange DCO, Inc., picking up a Designated Contract Market and a Derivatives Clearing Organization in a single transaction. Combined with its existing Futures Commission Merchant registration, Underdog says that makes it the first sports company holding the complete prediction market license stack.

Practically, it means Underdog can now list a contract, clear it, and hold customer funds without routing any part of the trade through an outside exchange, the same vertical-integration move DraftKings has been making. CEO Jeremy Levine framed the launch as doubling down on Underdog’s sports-first identity as the line between DFS, sportsbooks, and prediction markets keeps blurring.

Where to Put Your Underdog Bonus Funds This Week

The NFL slate is spread across quite a few windows for Underdog Pick’em this week. Falcons vs Saints gets the standalone Monday night spot, followed by Buccaneers vs Cowboys on Thursday. Sunday starts early with Eagles vs Jaguars in London at 9:30 a.m. EDT, then moves through the usual afternoon windows and Ravens vs Falcons on Sunday Night Football. Bills vs Rams finishes the stretch Monday night.

For Pick’em, I like having that much separation between games because there’s no reason to force everything into the Sunday afternoon slate. Player projections can move as injury reports and roles become clearer, so I’d still check the live Underdog board before submitting an entry rather than assuming an earlier projection is still available.

Here’s the confirmed NFL schedule:

All times are EDT. Sunday afternoon CBS and FOX coverage varies by market. Check the live Underdog board for the player markets available in your contest and location before submitting an entry.

🛡️ Protect Your Entries with Flex Picks

Even the best research can’t remove the variance.

A player can be replaced earlier than expected, a match can take an unexpected turn, or a golfer can struggle through a difficult stretch of holes. Flex is the feature most worth understanding before you build a bigger card.

When you build an entry with three or more picks, you can choose Flex to give yourself a little extra protection. Instead of needing every pick to hit, you can still earn a payout if one selection misses.

The tradeoff is a lower multiplier — a 5-pick Standard pays 20x, while a 5-pick Flex pays 10x if all five hit and 2.5x if you go 4-for-5. Worth reaching for on volatile slates, though as our own testing showed, Flex only rescues a card that misses by exactly one.

Underdog Promos for Existing Users

What happens when you’ve already created your account at Underdog?

Well, the Underdog promo code GRINDERS is ONLY for new users, but Underdog runs other promos for existing users, including profit boosts, insurance-style tokens, and referral bonuses.

Is Underdog a Sportsbook?

Underdog is entirely based on real-world sports and real player performances, including the MLB, NBA, NFL, NHL, UFC, and more. However, it’s important to understand that Underdog operates as a prediction market platform, not a traditional sportsbook.

Underdog’s app is completely operated by their prediction market exchange, so you can trade on team outcomes as well as player outcomes. The difference here is the verbiage associated with the placement of trades. You can also trade on season-long outcomes like who will win the Super Bowl or NFL MVP.

Is Underdog Legit and Safe?

Yes. Underdog is a highly secure, legitimate prediction market platform backed by major investors. The platform uses industry-standard security to protect your data and processes transactions.

Since prediction markets are federally regulated, they are widely available in more states compared to traditional sportsbooks.

Where Is Underdog Available?

Underdog has at least one product available in every state except for Nevada.

Check out our table for a full breakdown of Underdog available states and contests:

If you’re signing up for the promo, check state eligibility before you deposit and make sure the contest format you want is live where you are.

That saves you from going to the app, seeing a different lobby than expected, and assuming the offer didn’t work. It also gives you a better reason to use the bonus right away instead of figuring things out after the fact.

Underdog Contests & Games

Underdog started with the major sports (NFL, NBA, MLB, and NHL) but has since expanded to include college sports and other offerings like soccer, tennis, PGA, and esports.

When it comes to NFL DFS, Underdog stands out with simple but competitive formats that work for both casual and experienced players.

You can jump into snake drafts for daily, weekly, or season-long contests, or go straight to Pick’em with Higher/Lower and Rivals, where an 8-pick entry pays up to 120x.

Regular Daily Fantasy Drafts

Underdog has a typical fantasy draft option, with a scoring system that isn’t much different than what you see elsewhere. For their fantasy football leagues, Underdog has adopted 0.5 PPR (points per reception) scoring.

You can choose between two different draft speeds, Fast or Slow, depending on your needs and your desired draft experience. Each user is given 30 seconds per Pick in Fast Drafts, while Slow Drafts give users 8 hours per Pick.

If you want to try a unique draft game, check out Griddy’s fantasy football puzzle game.

Battle Royale Daily Fantasy Draft

Battle Royale is another popular feature that is unique to Underdog.

In Battle Royale, entrants select players through a snake draft, but with a twist: you’re not only competing against the others in your draft group, you’re competing against every group entered in the same contest.

At the end of the week, the players with the highest scores are awarded prizes based on the respective pool they entered.

Tips for Drafting Your First Battle Royale Lineup

Battle Royale can be a little intimidating, so here are some tips for newbies:

• Familiarize yourself with the scoring—knowing how many points you get for, say, steals can help you make better picks.
• Do your research beforehand so that your draft time doesn’t pass you by.
• Start small—being conservative with your initial entry fee will empower you to try again if things don’t initially go your way.

Best Ball Tournament Contests

Of course, Underdog’s main attraction for Best Ball is usually the NFL. Check out Best Ball Mania VI’s payout structures below.

Best Ball is a draft-only format where you pick your team at the start of the season, and Underdog automatically sets your highest-scoring lineup each week—no management required.

All contests use a snake draft, and once your roster is set, there are no waivers or lineup decisions. That makes it a great option if you want a more hands-off fantasy experience.

Best Ball contests vary by entry fee and prize pool, but they all follow the same core structure. It’s also where some of Underdog’s biggest tournaments and payouts are available.

If you want more insight so you can make smart picks, check out our NFL Best Ball Season Long Fantasy Rankings for Underdog.

Our DFS podcasts offer general insights for players interested in formats like best ball and daily drafts.

Playing College Football on Underdog

Underdog expanding its Best Ball contests into college football is one of the more useful additions this year.

I’m telling my friends and family who love college football to take advantage of the Underdog promo code GRINDERS and use it for entries into Best Bowl Mania. Especially for those in states that have yet to legalize online sports betting or college football player props, Underdog is the perfect alternative.

Some things to keep in mind:

• No NCAA daily fantasy drafts
• Pick’em and rivals are available for the NCAA
• No live scoring for college football
• You often have to wait until Thursday mornings ahead of Saturday games to find the NCAA pick’em options

Underdog Pick’em Contests

Here are the four contest types to know:

Does Underdog Have Early Cashouts?

Sort of. The “Win Now” feature originated on Underdog Champions contests, letting you lock in your Champions points and win a specified amount after the contest ends.

Usefully, the “Win Now” feature was extended to Streaks, so if you want to take the money and run on your Streak, you can do so. If you hit your first few picks, you don’t necessarily have to wait to see if the rest of your picks are also winners to walk away on top.

Underdog Banking: Deposits & Withdrawals

Funding your account and withdrawing winnings on Underdog is simple. Most methods are quick, but one key thing to know: you’ll usually need to withdraw using the same method you used to deposit.

Venmo, PayPal, and Trustly are the main payout options. Trustly is typically fastest at 24–48 hours; PayPal and Venmo usually land within 24–72.

Key Things to Know

• Withdrawals are always free
  
• Minimum withdrawal is $10
  
• You can withdraw your full balance even if it drops below $10
  

👉 Important: You must confirm withdrawals via email within 10 minutes, or the request will be canceled and funds returned to your account.

Here’s what the process actually looks like. You request the withdrawal in-app, then Underdog emails a confirmation link that expires in 10 minutes — miss it and the request cancels and the money returns to your balance.

Once confirmed, our own test request cleared inside the published window with no review step in between — the full timing is in our testing notes below.

Check out our review of EDGE Boost for more info on compatible Underdog banking methods.

My Experience With Underdog

Testing by Stephen Pierce, August 2026.

A $20 Apple Pay deposit was usable instantly with no hold before entering a contest — though this was an established account, so we can’t speak to first-time verification timing.

On August 27 we built a four-pick Standard card for $5 at 10x, all MLB strikeout props: Gerrit Cole over 5.5, Jacob Misiorowski over 8.5, Chris Sale over 6.5, Yoshinobu Yamamoto over 6.5. Sale and Yamamoto cleared comfortably at 11 and 8. Cole finished on 5, Misiorowski on 6. Two from four — which on a Standard entry pays exactly the same as zero from four.

Flex wouldn’t have rescued it either, and that’s worth understanding before you reach for it. A four-pick Flex pays on 3-of-4, not 2-of-4. Building all four legs from one volatile stat is the shape most likely to land you at two, which is the one place Flex offers nothing.

Withdrawals have been the most reliable part. A $25 request submitted at 7am on August 19 landed roughly 36 hours later, with no verification hold or payment review. The email confirmation step is real and it’s tight — you have 10 minutes to confirm, or the request cancels and the funds return to your balance.

Virginia shows the Champions format rather than standard Pick’em, and in practice it plays much the way Pick’em always did.

One gripe: the MLB board leans harder on home run props than on hits. If you build around 0.5 hits, there’s less on the board for you than the overall market count suggests.

Worth adding that the draft side is the part we’ve used longest — daily snake drafts with friends, or dropping into a bigger pool when there’s nobody around. That’s a different product from Pick’em and it’s held up over several seasons.

Pros & Cons

Underdog Responsible Gaming Tools

Underdog’s focus is on making sure every player has a safe and enjoyable experience. Daily fantasy sports should be a fun way to follow your favorite sports, and it is important to play within your means.

Underdog provides several built-in resources to help you manage your time and budget effectively.

• Self-Imposed Limits: You can set daily, weekly, or monthly restrictions on how much you deposit or the total amount you spend on entry fees. Once these limits are reached, the app will prevent further transactions until the period resets.
• Cool-Off Periods: If you feel the need to step away for a short time, the “Cool-Off” feature allows you to take a break from the platform for a few days or weeks.
• Self-Exclusion: For those who need a more permanent solution, Underdog offers a self-exclusion option. This restricts your access to the platform for a much longer duration or indefinitely.

State-Specific Protections

Depending on your location, you may notice automatic protections. For example, players in Massachusetts have a standard monthly deposit limit of $1,000, while Maryland and Tennessee also have state-mandated caps to encourage healthy play.

Underdog Customer Service

If you end up needing help on Underdog, you’ll be glad to hear that the customer service team is pretty helpful.

• Live chat: Verify your account before speaking to an actual customer service rep instead of a robot.
• Twitter/X: @UDSupport
• Email: support@underdogfantasy.com.

Support is available 24/7, though response times can vary depending on volume. And from what we’ve seen, Underdog often hits users with the “volume is higher than usual” disclaimer.

Underdog Mobile App Review (October 2026)

✅ The Underdog app is easy to use and runs smoothly when you need to grab last-minute picks before an event starts.

✅ The interface avoids unnecessary clutter. You can easily toggle between standard drafts, Pick’em lobbies, and tracking your active entries.

✅ Depositing and withdrawing funds feels intuitive.

✅ The platform presents complex player data in a digestible format.

❗We didn’t hit any lag or errors across our testing sessions, including on a full MLB evening slate, about 15 taps from opening the app to a submitted entry.

Here’s how it reads to someone newer to the platform:

Underdog has become a major player in the DFS space, and the app is where that shows.

Getting to things that you actually care about, the Underdog app may not jump out immediately, but it functions very well. The home screen welcomes you with promotions, trending picks, popular picks, and the key matchup of the day. In other words, it’s what a home screen should be.

Of course, you can also search for particular players, teams, or stat types to make picks on. And if Pick ’em isn’t your thing, you can head over to Drafts and get in on some old-school DFS action.

Joe Beguiristain, novice DFS player

Where Underdog Stands Out

Underdog stands out for three things: the Best Ball Mania prize pool, a clean app, and a steady run of promos for existing users.

Perhaps one of Underdog’s biggest draws is its access to college football. This offering is large for SEC football fans, considering that many southeastern states don’t have operators with legal online sports betting licenses. And even if they do, restrictions on college props can restrict your play.

But with Underdog’s multiple contests, you can get in on the college ball action despite many legal regulations that prohibit other types of real money play and the claiming of bonuses like the Underdog promo code GRINDERS.

Underdog Promo Code FAQs

Hopefully, we were able to answer any lingering questions about Underdog above. If not, check out our top Underdog FAQs below.

What is the best Underdog promo code for new users?

The best Underdog promo code for new users is GRINDERS. Use it during signup to get the exclusive welcome offer: Play $5, Get $100!

Is Underdog legit?

Yes, the Underdog app is legit with a massive group of high-profile investors that includes Mark Cuban, Kevin Durant, Adam Schefter, The Chainsmokers, Nas, and Future. The platform operates within the legal framework of each state it operates in, ensuring that your deposits and winnings are protected.

What’s the minimum deposit at Underdog?

The minimum deposit at Underdog is $10, which you can make via online bank transfers, credit/debit cards, or PayPal. Though this amount is a little higher than the $5 minimum deposit requirement at other DFS apps, it’s still an affordable way to get in on the action.

What is Underdog?

Underdog is a daily fantasy sports site and app that offers various real money DFS contests. Underdog users can play pick’em, best ball, and snake drafts at this legal DFS platform that operates in the majority of states.

Does Underdog pay real money?

Yes. Winnings are real cash, withdrawable through PayPal, Venmo, or Trustly with a $10 minimum.

How does Underdog pay out winnings?

Submit a withdrawal request and confirm it by email within 10 minutes. Funds typically arrive within 24–72 hours depending on method, with Trustly the fastest.

Which states have Underdog?

The app works in 42 states plus Washington, D.C. — everywhere except Connecticut, Hawaii, Idaho, Iowa, Louisiana, Montana, Nevada, and Washington. Fantasy contests are live in all 42 except Maine.