As of Tuesday, Aug. 4, 2026, Polymarket promo code MASS has been extended from the MLB trade deadline for tonight’s opening game of a three-game series between the Boston Red Sox and Chicago White Sox at Fenway Park. Eligible new users can enter MASS during registration, deposit at least $10 and receive $20 in promotional trading funds for a $30 starting balance. The bonus may be used on available moneylines, run lines, totals and other MLB prediction markets.
Boston enters the series after an aggressive trade deadline highlighted by the additions of three-time All-Star catcher Adley Rutschman and infielder Curtis Mead. The matchup carries postseason importance for both clubs, with Chicago competing near the top of the AL Central and Boston strengthening its roster for the stretch run. Confirmed lineups, the availability of Boston’s new additions, pitching updates, bullpen usage and late trading activity could move Polymarket prices before first pitch.
Polymarket lists MASS as a verified promo code for eligible first-time U.S. users. Follow these steps to claim the offer and start trading:
Steps to redeem the Polymarket promo code MASS for Red Sox, MLB:
- Go to Polymarket.com or install the mobile app.
- Set up a new account and use the Polymarket promo code MASS into the referral or invite box.
- Finish the required identity verification process.
- Fund with at least $10 and the $20 bonus will appear instantly.
New users can begin trading once the bonus funds arrive. Funds apply to any active Polymarket prediction market, including sports, the economy and global politics.
Terms for Polymarket promo code MASS:
- Offer: $20 trading bonus
- Required deposit: $10
- Code: MASS
- Who qualifies: New Polymarket US accounts only
- Active as of: Late July
- Market access: All active Polymarket prediction markets
Polymarket prices for White Sox vs. Red Sox on Tuesday
Polymarket traders give Boston a modest edge over Chicago in Tuesday’s matchup. The Red Sox are priced at 56 cents on the moneyline, while the White Sox sit at 45 cents. The market also leans slightly toward a higher-scoring game, with Over 8.5 runs trading at 54 cents.
| Market | White Sox/Yes/Over | Red Sox/No/Under |
|---|---|---|
| Moneyline | White Sox 45¢ | Red Sox 56¢ |
| Run line | White Sox +1.5 at 63¢ | Red Sox -1.5 at 38¢ |
| Total runs | Over 8.5 at 54¢ | Under 8.5 at 47¢ |
| First-inning run | Yes 50¢ | No 52¢ |
| Extra innings | Yes 11¢ | No 93¢ |
Featured 3-pick combos on Polymarket:
- First five handicap, 5.11x: White Sox first-five spread, first-five innings Over 4.5 runs and Red Sox moneyline.
- Extra innings drama, 5.36x: Extra innings Yes, Red Sox moneyline and Over 9.5 total runs.
Boston’s 56-cent moneyline price reflects a competitive matchup rather than a commanding favorite. Chicago +1.5 is the most expensive primary position at 63 cents, suggesting traders see value in the White Sox keeping the game close even while favoring the Red Sox to win.
Polymarket odds shift in real time as traders process breaking news, injury reports, and overall market sentiment.
View and trade full Polymarket odds for MLB markets.
Polymarket promo code vs. Kalshi promo code: Which offer is better right now?
Polymarket and Kalshi offer U.S. customers access to prediction markets and welcome promotions for eligible new users. Here’s how the two platforms compare:
Polymarket’s MASS promo code and Kalshi’s current welcome offer add value to Tuesday’s MLB board, though the platforms use different trading systems. Polymarket follows a peer-to-peer model, while Kalshi matches buy and sell orders through an exchange-style order book. MASS gives eligible new Polymarket users promotional funds for available Tuesday MLB markets.
Verified Polymarket promo codes:
MASS is a verified Polymarket partner code that gives eligible new users $20 in promotional trading funds. Approved codes promoted by other regional partners provide the same welcome bonus.
Conclusion: Claim Polymarket promo code MASS for Tuesday’s MLB board
Polymarket promo code MASS is updated for Tuesday’s full MLB schedule following the trade deadline. Eligible new users can enter MASS during registration, deposit at least $10 and receive $20 in bonus trading funds for a $30 starting balance. Market prices may move before first pitch as post-deadline roster changes, confirmed lineups, pitching updates, bullpen availability and trader demand influence each baseball contract.
Use Polymarket promo code MASS to explore Tuesday’s MLB matchups and the platform’s broader selection of active prediction markets.
Must be 18 years or older and have a legal, U.S. residential address within the applicable state, D.C., or U.S. territories. Polymarket is a prediction market platform. Trading involves risk. Only participate where legally permitted and never trade more than you can afford to lose.
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