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Polymarket promo code SPORTSLINE: Get $50 bonus for Red Sox-Orioles, Brewers-Mets in MLB on Tuesday

New Polymarket users can get a $50 bonus Sunday when they deposit $20 and trade on the day's sports action

ByUpdated: Jul 21, 2026 7:39PM UTC . 4 min read
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The All-Star Break has concluded, and that means it is a great time to dial into the second half of the MLB season and take advantage of the Polymarket promo code SPORTSLINE, which gives new users a $50 bonus when they deposit $20 to make trades. The Dodgers and Phillies lead off tonight's baseball action with a clash that could determine who sits atop the National League in the coming months. The Mets and Brewers matchup features a few friendly foes returning against their former teams and the Red Sox potentially have an 80-year-old record in sight at Fenway against the Orioles. Click here to get started and claim your $50 bonus after depositing $20 with the Polymarket promo code SPORTSLINE: 

For the terms and conditions of this offer, be sure to check out the Polymarket promo code review page.

How to sign up for the Polymarket referral code SPORTSLINE

You can sign up for this Polymarket offer using the steps listed below. This offer is only available for new users.

  1. Click CLAIM BONUS on this page. Download the Polymarket app.
  2. Create an account and provide all the required information, such as name, email and payment details. Use the code SPORTSLINE to get your bonus.
  3. Make a first deposit by your preferred deposit method and follow the prompts.
  4. New users must deposit at least $20 in contracts for the $50 trading bonus to be applied to their account.

After depositing $20 with the Polymarket promo code, new users will be given a $50 trading bonus: 

Tuesday MLB trading preview

We are down to the last of two games in the regular season series between the Phillies and the Dodgers, and going into tonight it's currently tied at 2-2. The Phillies have won three of their last five regular season series against the Dodgers since 2021. Both teams are looking to win this series that has implications in the NL playoff race. Philadelphia is trading at $0.54 per share to win, and Los Angeles is at $0.47. Today's primetime matchup has already generated over $200,000 in trading volume on Polymarket.

In another National League matchup, the Mets and Brewers clash. Former long-time Brewers' ace Freddy Peralta, now in New York, allowed seven runs in his highly anticipated but disappointing return to Milwaukee in yesterday's 8-3 loss. Tonight's game will also include some drama, as the probable pitching matchup features Brewers prospect Brandon Sproat, who was acquired for Peralta last season. He is priced at $0.90 per share to record more than 2.5 strikeouts tonight on Polymarket. Milwaukee is also trading for $0.56 to win this matchup, and New York is at $0.46 on Polymarket. 

For baseball fans on the East Coast, we have another AL East showdown tonight at Fenway between the Orioles and Red Sox. The trading volume for this game has been steadily increasing, surpassing $300,000 on Polymarket. Boston is eager to win as they currently hold the third and final wild card spot thanks to a historic 14-game win streak dating back to early July. The Red Sox are trading at $0.52 against the Orioles at $0.49 on Polymarket. Boston can match a franchise record by if it collects a 15th consecutive win. Trade on the MLB and more with the Polymarket promo code SPORTSLINE:

Responsible Risk Management

Polymarket offers different ways to keep its users safe with risk management tools like trading breaks, a voluntary opt-out feature and funding limits.  

Prediction Markets are regulated by the Commodity Futures Trading Commission (CFTC) - an independent agency of the U.S. federal government.

Event contracts trading involves a risk of substantial loss and is not suitable for all investors. Participation in prediction markets is subject to applicable eligibility requirements. Participation may be restricted or prohibited in certain jurisdictions and participants are responsible for ensuring their participation complies with applicable laws and regulations in their jurisdiction.

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Ryan Wooden
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