Prediction Market Promos: Trade on MLB Games like Brewers vs Cubs with Up To $1,390 in Prediction Bonuses

Peter Clarke - Senior Editor at Covers.com
Peter Clarke • Senior Editor 16+ years betting experience
Updated: Sep 2, 2026 , 02:39 PM ET • 3 min read

Explore the best predictions market promos for Brewers vs. Cubs on Sept. 3, featuring welcome offers from Kalshi, Polymarket and more.

Claim prediction market welcome bonuses by signing up today!
Photo By - Claim prediction market welcome bonuses by signing up today!

Fans looking to explore predictions market promos ahead of Wednesday's Brewers vs. Cubs game can find plenty of welcome offers worth claiming. New users can download any of the best prediction market apps and browse the latest prediction market promos before placing their first trade. Each platform below offers a sign-up bonus for new customers heading into Wednesday, September 3.

Our best prediction market promos

Top 8 Prediction Markets Welcome Offers Claim Now
Kalshi $35 Trading Bonus Claim $35 with code 'COVERS35'
Polymarket Deposit $10, Get $50 Bonus Claim $50 with code "COVERS"
ProphetX Trade $10, Get $20 Claim $20 with code "COVERS"
Novig Deposit $10, Get $25 Claim $25 with code "COVERS"
OG.com Trade $10, Get $10 Bonus Claim $10
Underdog 50% Deposit Match up to $1,000 Claim $1,000 with code "COVERS"
Crypto.com Unlock $50 Bonus Claim $50
DraftKings Predictions Spend $5, Get $200 in Prediction Dollars Claim $200

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Prediction Market Promos for Brewers vs. Cubs

Wednesday's Brewers vs. Cubs matchup at Wrigley Field, featuring Jacob Misiorowski against David Peterson, gives new users an added reason to check out the prediction market space. Below are the latest offers from some of the best prediction market sites, including several of the best predictions promos available heading into the Wednesday, September 3, MLB matchup.


No. 1: Kalshi

Trade $25, Get $35 Bonus

Certain limitations apply. The offer is available to new users only, subject to the terms and conditions specified by Kalshi. 18+ only. Restrictions and eligibility requirements apply. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information.

Kalshi

The Kalshi promo code COVERS35 unlocks a "Trade $25, Get $35" welcome offer for eligible new customers. Kalshi allows users to trade contracts on sports, politics, economics and pop culture events.

Terms and conditions:

  • Available in all states except Nevada and Washington.
  • Users must be physically located in an eligible location.
  • Eligible new customers can use the Kalshi promo code or an eligible referral link, but not both.
  • Limited to one offer per Kalshi account.
  • A government ID or passport, plus a selfie, is required for verification.
  • Requires an initial deposit of at least $10 and a transaction of at least $25 on Kalshi's Predictions product.
  • The $35 bonus is credited once $25 in trades is completed, regardless of outcome.
  • Bonus credit cannot initially be withdrawn, must be used on Kalshi's Predictions product, and expires seven days after issuance.

How to claim the Kalshi promo code:

  1. Register on the Kalshi landing page and enter the Kalshi promo code COVERS35, providing personal details and identity verification.
  2. Deposit at least $10 into the Kalshi wallet using an available payment method.
  3. Transact at least $25 on Kalshi's Predictions product.
  4. Withdraw eligible cash proceeds through the Transfers section once requirements are met.

No. 2: Polymarket

 Polymarket Logo 

Get $50 With Code COVERS

18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See https://polymarket.com/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 exchange and clearing organization.

Polymarket

New users can enter the Polymarket promo code COVERS to claim a "Deposit $10, Get $50" trading bonus. The offer requires an initial deposit of $10 to unlock the reward.

Terms and conditions:

  • Available in all states except Nevada.
  • Users must be physically located in an eligible location.
  • Sign up with the Polymarket promo code COVERS to trigger the offer.
  • Proof of ID, including a photo of a driver's license or passport plus an accompanying selfie, is required.
  • An initial deposit of $10 is required.

How to claim the Polymarket promo code:

  1. Visit the Polymarket US app, select "Sign Up" and enter the Polymarket promo code COVERS, registering with a Google or Apple ID.
  2. Provide a username, full name, date of birth and address, then complete identity verification.
  3. Deposit at least $10 using debit card, ACH bank transfer or wire transfer.
  4. Select an event contract, choose an outcome, enter a trade amount and confirm the transaction.
  5. Withdraw eligible funds once cleared, returning to the original funding source.

No. 3: ProphetX

 ProphetX Logo 

Get $20 With Code COVERS

Restrictions and eligibility requirements apply. The offer is available to new users only, subject to the terms and conditions specified by ProphetX. 18+ only. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. ProphetX products are not available in all jurisdictions.

ProphetX

Registering with the ProphetX promo code COVERS unlocks a "Trade $10, Get $20" bonus for new customers. Users must deposit at least $10 and trade at least $10 in event contracts to receive the reward.

Terms and conditions:

  • Available in all states plus Washington, D.C., excluding Nevada.
  • Users must be physically present in an eligible location.
  • Sign up with the ProphetX promo code COVERS to trigger the offer.
  • A government ID or passport, along with a selfie holding that ID, is required.
  • Requires an initial deposit of at least $10 and a trade of at least $10 in event contracts.
  • The $20 bonus is credited once the $10 trade requirement is met, regardless of the outcome.
  • The offer is ongoing.

How to claim the ProphetX promo code:

  1. Launch the ProphetX app or desktop site, select "Register," and provide full name, date of birth, address, Social Security number and phone number, then enter the ProphetX promo code COVERS.
  2. Verify identity with a driver's license or passport photo and confirm the one-time PIN sent by text.
  3. Deposit at least $10 through the banking section.
  4. Place a trade of at least $10 on an available market.
  5. Receive the $20 bonus and withdraw eligible winnings, typically processed within five business days.

No. 4: Novig

Deposit $10, Get $25

COVERS

Restrictions and eligibility requirements apply. The offer is available to new users only, subject to the terms and conditions specified by Novig. 21+ only. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Novig products are not available in all jurisdictions.

Novig

The Novig promo code COVERS activates a "Deposit $10, Get $25" welcome offer, delivered as five Trade Credits worth $5 each. The credits must be used on contracts priced between $0.01 and $0.60 and expire after 30 days.

Terms and conditions:

  • Users must be at least 21 years old and enter the Novig promo code COVERS during registration.
  • A qualifying deposit and trade are required to activate the offer.
  • Requires a minimum deposit of $10 and a minimum trade of $5.
  • Novig Coins are non-withdrawable and hold no monetary value, though Novig Cash can be exchanged for prizes.
  • The offer is available nationwide and has no end date.

How to claim the Novig promo code:

  1. Download the Novig app from the App Store or Google Play Store and select "Sign Up."
  2. Provide full name, home address, email and Social Security number to verify the account.
  3. Enter the Novig promo code COVERS during registration.
  4. Deposit at least $10 and place a trade of at least $5 to receive the Trade Credits.

No. 5: OG.com

OG.com Logo

Trade $10 & Get $10

 

Campaign period: Extended. The promotion expires seven days after account verification, and only events settled within this seven-day window are eligible. Each qualifying trade must be worth at least $10 and have a probability below 80%. Trades at or above 80% probability will not count. Trades are counted only after they have settled, and trades placed using rewards are not eligible.

OG.com

OG.com offers a "Trade $10, Get $10" new-user reward, and no OG promo code is required to qualify. Users must verify their account and settle a qualifying trade of at least $10 within seven days of identity verification approval.

Terms and conditions:

  • Users must verify their account and confirm eligibility for the promotion.
  • A qualifying trade of at least $10 must settle within seven days of KYC approval.
  • Only trades with implied probabilities below 80% qualify.
  • Trades are only counted once settled, and trades placed using reward funds do not count.

How to claim the OG offer:

  1. Visit OG.com or download the app, select "Sign Up," and verify an email address and mobile phone number.
  2. Complete identity verification with full name, date of birth and the last four digits of a Social Security number.
  3. Deposit funds using a debit card, Apple Pay, Google Pay, ACH transfer or wire transfer.
  4. Place and settle a qualifying trade of at least $10 with an implied probability below 80% within seven days of verification.
  5. Withdraw eligible earnings through the portfolio section using a linked bank account.

No. 6: Underdog

50% Deposit Match up to $1,000
Code: COVERS

Must be 18+ (19+ in AL, NE; 19+ in CO for some games; 21+ in AZ, MA, and VA) and present in a state where Underdog Fantasy operates. Terms apply. Offer not valid in MD, MI, NJ, NY, OH, and PA. Concerned with your play? Call 1-800-MY-RESET or 1-800-GAMBLER or visit www.ncpgambling.org; AZ: 1-800-NEXT-STEP (1-800-639-8783) or text NEXT-STEP to 53342; NY: Call the 24/7 HOPEline at 1-877-8-HOPENY or Text HOPENY (467369).

Underdog

The Underdog promo code COVERS provides a 50% deposit match up to $1,000 for eligible new customers. A minimum deposit of $10 is required, and the maximum match requires a $2,000 deposit.

Terms and conditions:

  • Available to eligible new Underdog customers using code COVERS.
  • Requires a minimum deposit of $10, with the match capped at $1,000.
  • Bonus entries can take up to 72 hours to appear after the qualifying deposit resolves.
  • Users must complete 1x the value of the deposit plus bonus in eligible entries within 14 days.
  • Unused promotional balance may be forfeited if the playthrough is not completed within 14 days.
  • Winnings generated during the playthrough period may be withdrawable, though bonus entries themselves are not directly withdrawable.
  • Only one promotion can be selected if a "Choose Your Offer" option is presented.

How to claim the Underdog promo code:

  1. Register a new account and enter the Underdog promo code COVERS in the promo-code field.
  2. Complete identity verification, providing requested personal and location information.
  3. Deposit at least $10, keeping in mind that a $2,000 deposit is needed for the maximum $1,000 match.
  4. Receive bonus entries within 72 hours of the deposit resolving.
  5. Complete the required 1x playthrough on eligible entries within 14 days.

No. 7: Crypto.com

Spend $5, Get $200

Restrictions and eligibility requirements apply. The offer is available to new users only, subject to the terms and conditions specified by Crypto.com. 18+ only. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Crypto.com products are not available in all jurisdictions.

Crypto.com

Crypto.com offers a "Play $5 Get $50 in Bonus Entries" promotion, and no Crypto.com promo code is necessary since the offer applies through the eligible sign-up link. Users must deposit at least $10 to receive a bonus match to their stake, up to $50 in CRO.

Terms and conditions:

  • Available in most states plus Washington, D.C., excluding Arkansas, Arizona, Connecticut, Illinois, Louisiana, Massachusetts, Maryland, Michigan, Nevada, New York and Ohio.
  • No referral code is required to access the offer.
  • Registration requires personal information, such as legal name and email address, plus proof of ID.
  • A minimum initial deposit of $10 is required to receive the matched bonus.
  • The offer is ongoing with no expiration date.

How to claim the Crypto.com offer:

  1. Download the Crypto.com app from the App Store or Google Play and register through the eligible sign-up link.
  2. Complete KYC verification by confirming a phone number and providing a government-issued ID.
  3. Deposit at least $10 using fiat currency or cryptocurrency.
  4. Navigate to the "Sports" tab within the predictions marketplace and place a prediction by buying or selling a contract.
  5. Withdraw winnings through the "Transfer" section by selecting "Withdraw Funds" and a linked payment method.

No. 8: DraftKings Predictions

Spend $5, Get $200

Event Contract Trading is offered by DraftKings Predictions, a CFTC-registered Futures Commission Merchant and NFA member. Trading involves substantial risk of loss and is not suitable for everyone. Market availability varies. Eligibility restrictions apply. 1 per new DraftKings customer. $5+ first-time trade req. Max. $200 issued as non-withdrawable Predictions Dollars that expire in 1 year. Reward issued as $50 in Predictions Dollars every 7 days via click-to-claim for 21 days. Click-to-claims expire 7 days after issuance. 7 days = 168hrs. Terms: http://dkng.co/predictionspromo . Ends 9/20/26 at 11:59 PM ET. Sponsored by DK.

DraftKings Predictions

DraftKings Predictions offers a "Spend $5, Get $200 in Prediction Dollars" welcome bonus, and no DraftKings Predictions promo code is required. Eligible new customers must place a first event-contract trade of $5 or more to qualify.

Terms and conditions:

  • Users must be new DraftKings customers, at least 18 years old and located in an eligible U.S. state or territory.
  • Identity verification may be required before trading or claiming the offer.
  • The qualifying trade must be placed using cash from the account balance.
  • Prediction Dollars are issued as $50 every seven days via click-to-claim for 21 days, totaling $200.
  • Prediction Dollars are non-withdrawable and expire one year from issuance, while click-to-claims expire seven days after issuance.
  • Eligibility, deposit requirements and market availability may vary by jurisdiction.

How to claim the DraftKings Predictions offer:

  1. Open DraftKings Predictions and create a new account or log in with an existing DraftKings account.
  2. Complete identity verification and add cash to the account balance.
  3. Place a qualifying event-contract trade of at least $5 in an available market.
  4. Visit the Rewards section to track and claim the $200 in Prediction Dollars over the following 21 days.

New users have plenty of options to consider among the best prediction market sites ahead of Wednesday's Brewers vs. Cubs matchup in MLB. Each platform above comes with its own terms, so reviewing the requirements before signing up is recommended. Comparing the best predictions promos can help fans find the offer that fits how they plan to use these platforms.


Affiliate Disclosure: Our team of experts has thoroughly researched and handpicked each product that appears on our website. We may receive compensation if you sign up through our links.

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Peter Clarke - Covers
Senior Editor

Peter Clarke is dedicated to keeping bettors informed about the biggest sports betting events, such as the Super Bowl and March Madness, and the best way to cash in on sportsbook promos. He's also always on top of the latest welcome offers from the biggest sportsbooks, so he can share the best deals and the most exciting games to use them on every day.

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