Polymarket Promo Code GRINDERS: Get a $20 Trading Bonus! (August 2026)

by Virginia Gandolfo (vgandolfo) Last Updated 2026-08-17T17:41:46
✅ Fact checked by Pablo Capris

Updated on 8/20/26

Polymarket

Deposit $10, Get a $20 Trading Bonus!

Bonus Code

GRINDERS

Claim $20

18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See http://polymarket.us/tos for more information. The Polymarket US App serves as an independent software provider and affiliate of Polymarket US and Polymarket Clearing, the CFTC-regulated derivatives exchange and clearing organization. Not available in AZ, IL, MA, MD, MI, MT, NV, and OH.

New users who enter the Polymarket referral code GRINDERS during signup can qualify for the current offer: Deposit $10, Get a $20 Trading Bonus!

Polymarket US is a federally regulated event-contract exchange rather than a traditional sportsbook. Here, users buy and sell contracts tied to sports and other real-world outcomes, with prices changing as orders enter the market. The U.S. exchange operates through QCX LLC, which does business as Polymarket US and holds a Commodity Futures Trading Commission Designated Contract Market designation.

What is the Polymarket Referral Code?

The Polymarket referral code is GRINDERS. Eligible new users must enter it during registration and deposit at least $10 to qualify for $20 in trading credits.

The credit cannot be withdrawn on its own. It must first be used as collateral for a position. Once that position settles or is closed, any funds released from it may become eligible for withdrawal under Polymarket’s standard account rules.

How to Use the Polymarket Promo Code GRINDERS

1. Download the Polymarket US app from the App Store or Google Play.
2. Create a new account and enter GRINDERS in the promo or referral code field during signup.
3. Complete the identity-verification process in the app.
4. Deposit at least $10 by debit card or ACH bank transfer.
5. After the qualifying deposit clears and the offer requirements are met, the $20 trading credit is added to the account.

Remember: the code has to be entered during registration. It cannot be added to an existing account after signup.

You can compare this offer with the other platforms covered in our Best Prediction Market Apps.

What to Trade With GRINDERS Right Now

Once the credit is added, it can be used as collateral on eligible markets in the Polymarket US app, including sports. Baseball is the busiest board right now, with a full week of games as the season inches towards the end.

Two series stand out: Yankees–Orioles at Camden Yards and White Sox–Cubs at Wrigley Field. Series like these are good spots to put the credit to work, and because you can sell a contract before the final out, you’re not locked in if the price moves your way mid-game.

Sports markets can cover game winners, totals, player statistics, tournament advancement, conference champions, and season-long futures. The app also carries markets tied to politics, finance, economics, technology, crypto, culture, weather, and other real-world events, though the lineup changes over time.

Keep in mind Polymarket US and the international Polymarket site operate separately, so a contract on one may not be listed on the other. Check the U.S. app before deciding where to use the credit.

How Do Sports Markets Work at Polymarket?

Polymarket sports markets can cover game winners, totals, player statistics, tournament advancement, conference champions, and season-long futures.

Each contract trades between $0.01 and $0.99. A “Yes” contract priced at $0.55 suggests that traders are giving the outcome roughly a 55% chance, while the matching “No” side would be priced around $0.45.

Those prices can change whenever traders react to new information. For instance, LeBron James officially joining the Philadelphia 76ers on a two-year, $8 million deal in late July 2026 gave the market another major roster move to account for when pricing the Eastern Conference race.

Here’s how a payout could work. Say you buy 90 “Yes” contracts at $0.55:

• The position costs $49.50 before fees.
• If the market settles “Yes,” each contract pays $1.
• You receive $90, leaving a $40.50 gain before fees.
• If the market settles “No,” the contracts pay $0 and you lose the $49.50 spent.

You can also sell the contracts before the market settles, provided another trader is willing to buy them. And, depending on how the price has moved, you may receive more or less than you originally paid.

For another sports-focused option, see our DraftKings Prediction review.

How Should You Trade Live Sports Markets on Polymarket?

Before you place a bet, it’s important to understand exactly how the market will decide who wins. This is called the “settlement rule,” and it can vary more than you might expect.

For example, two soccer markets might look identical at first glance, but they can settle in completely different ways. One might only count the score after 90 minutes, while another includes extra time and penalties. So even if the same team “wins” the match overall, the contract could still settle as a loss depending on the rules.

Player markets can be even more specific. Some require the athlete to actually start the game, or play a minimum number of minutes, while others depend on official stats from a specific source, which means the result might not match what you see on TV or in real time.

Next, take a look at the buy and sell prices. The difference between them is called the “spread.” If that gap is wide, it usually means it costs a bit more to get in and it may be harder to sell quickly at the price you expect.

It’s also important to check how many contracts are actually available at each price. Sometimes a price looks appealing, but there are only a few contracts for sale at that level. If you try to buy more, your order may get filled at worse and worse prices, which raises your average cost.

To help with this, you can use a limit order. This lets you set the exact highest price you’re willing to pay (or the lowest price you’re willing to accept). It gives you more control, but the trade-off is that your order might not get filled if the market never reaches your price.

Finally, think about your exit plan before you even enter the trade. You can hold until the market settles, sell early if the price moves in your favor, or cut your losses if things go the wrong way. One thing to keep in mind: near the end of a game, trading can slow down a lot, and it may be harder to find someone willing to buy or sell at a fair price.

What Do Polymarket App Reviews Say?

Feedback is pretty mixed depending on whether you’re using iPhone or Android.

When we checked the stores on August 5, 2026, Polymarket had a 4.6 out of 5 rating from about 53,000 reviews on the Apple App Store. On Google Play, it was lower at 3.6 out of 5 from roughly 8,910 reviews.

The difference between the two is pretty noticeable. iPhone users seem generally satisfied, while Android users report more technical issues and frustration with execution during volatile moments.

That said, it’s worth taking individual reviews with a grain of salt. App store ratings are self-reported and can reflect anything from temporary bugs to account-specific verification checks or even outdated app versions.

Still, when you see repeated complaints about withdrawals, account holds, app stability, or slow support, it’s something to keep in mind before using the Polymarket promo code GRINDERS and depositing real money.

And now that we’re on that topic, let’s talk about how you actually move money in and out.

How Do You Deposit and Withdraw Money on Polymarket?

The main deposit methods in the Polymarket US app are debit card and ACH bank transfer. Its payment system also supports card and Apple Pay transactions, although the exact options shown can depend on the account.

Debit-card and Apple Pay deposits are listed as instant, while ACH transfers can take one to three business days. Verification checks, bank processing, and payment-provider reviews may affect the actual timing.

To deposit:

1. Open your profile in the Polymarket US app.
2. Select “Deposit.”
3. Choose one of the funding methods available to your account.
4. Enter the amount and confirm the transaction.

Withdrawal options show up in the account once the funds are eligible. Polymarket checks the available balance and any funding-source requirements before processing the request, so not every withdrawal method will necessarily appear for every user.

See how the banking experience at FanDuel Predicts compares with Polymarket’s.

Does Polymarket Charge Fees?

Yes. Polymarket charges a small fee when you buy or sell a contract immediately with someone else’s existing offer. This is called a taker order, because you’re essentially “taking” someone else’s price from the market.

If instead you place an order and wait for someone else to accept it, that’s called a maker order. In many cases, maker orders are rewarded with a small rebate (a tiny bonus) instead of a fee, because you’re helping add liquidity to the market.

That being said, fees aren’t a fixed amount. They depend on the contract price and how many contracts you trade. In general, fees are higher when the price is around $0.50 (where uncertainty is highest) and lower when the price is closer to $0 or $1 (where the outcome is more certain).

If your order is canceled, rejected, or expires without being filled, you won’t be charged anything because no trade actually took place. Before you confirm any trade, Polymarket also shows you the exact fee upfront so you know the cost in advance.

Polymarket Pros and Cons

Pros

• Polymarket US operates through a CFTC-designated contract market.
• Positions can be sold before settlement when a matching order is available.
• The platform covers sports as well as lots of non-sports categories.
• U.S. accounts use dollar-denominated balances, with no crypto wallet required.
• Executed maker orders get a rebate under the current fee schedule.

Cons

• Niche markets can have wide spreads or limited order-book depth.
• Orders that execute immediately as taker trades carry a fee.
• Android ratings trail the iPhone version by a noticeable margin.
• Some recent app-store reviewers reported withdrawal, verification, support, and app-performance problems, though complaints were typically met with responses from Polymarket directing users to customer support.

Kalshi vs. Polymarket: What Are the Key Differences?

Neither platform is strictly better than the other; it really depends on how you like to trade.

Kalshi is a bit more flexible when it comes to funding your account, which can make getting started easier. Polymarket, on the other hand, can be more appealing if you’re comfortable placing limit orders and letting the market come to you, especially with its current maker rebate setup.

Read our full Kalshi vs. Polymarket review for a closer comparison.

How Did Polymarket Return to the US?

Polymarket returned to the U.S. market in 2025 by acquiring QCEX, a company that owned a federally regulated exchange and clearinghouse.

That exchange, QCX LLC, is now operating under the name Polymarket US and is approved by the Commodity Futures Trading Commission (CFTC) as a Designated Contract Market.

QCEX, QCX, and Polymarket US are related names from the same corporate structure, but they refer to different parts of the business, meaning they don’t refer to exactly the same legal entity.

Recent Polymarket Legal and Business Timeline

Earlier Polymarket History

In January 2022, Polymarket reached a settlement with the CFTC that included a $1.4 million civil penalty and a requirement to shut down markets that didn’t meet federal derivatives rules. The regulator said Polymarket had been offering event-based binary markets without the proper approval to operate as a regulated exchange. Today, Polymarket US runs through QCX LLC, a separate entity that has since been designated as a federally regulated contract market.

Customer Support at Polymarket

Polymarket US provides customer support through in-app chat and by email at support@polymarket.us.

When reporting an issue, include:

• The market name
• The order or transaction details
• The date and approximate time
• Any error message shown
• Screenshots that help explain what happened

Never send your password, authentication codes, or complete banking details.

Polymarket US also has a recurring maintenance window every Thursday from 2 a.m. to 6 a.m. ET. Open orders are canceled before maintenance begins, and order books reopen empty once trading resumes. If the app seems unavailable during that period, check the platform’s system-status page before contacting support.

Responsible Trading at Polymarket

Only trade with money you can afford to lose. Anyone who needs help with gambling-related harm can call or text the National Problem Gambling Helpline at 1-800-MY-RESET. The service is available across all 50 states and U.S. territories.

For more information on setting limits and recognizing risky trading behavior, read our responsible trading guide.

Polymarket Promo Codes FAQs

What is the Polymarket promo code and referral code?

The Polymarket promo code and referral code are both GRINDERS. New users who enter it at signup and deposit at least $10 can get $20 in trading credits.

Can I withdraw the $20 Polymarket bonus directly?

No. You’ll need to use the credit to open a position first. Any profits you make after closing it can then be withdrawn.

Is Polymarket legal in the US?

Yes. Polymarket US operates through QCX LLC, a CFTC-designated contract market and is legally available in over 40 states. Just keep in mind the GRINDERS offer is restricted in AZ, IL, MA, MD, MI, MT, NV, and OH.

Does Polymarket have sports betting?

Not exactly. Polymarket US offers sports event contracts, not traditional sportsbook bets. These can include game winners, totals, player stats, and futures.

For standard sportsbook betting, check out our guide to the Top 11 Best Mobile Sports Betting Apps.

Does Polymarket charge fees?

Yes. You pay a fee when you take an order. If you place a maker order, you may earn a rebate. Unfilled orders aren’t charged.

How long do Polymarket deposits take?

Debit cards are usually instant. ACH transfers take 1-3 business days, depending on your bank and verification.

Is Kalshi better than Polymarket?

It depends. Kalshi offers more ways to fund your account, while Polymarket can be better for maker rebates and limit-order trading. The better platform is usually the one with the best prices and liquidity for the specific market you want.