Sign up with Polymarket MLB promo code STIFFS and make an initial deposit of $20 or more to unlock a $50 bonus. Click here to start the registration process.
This welcome offer provides an immediate capital boost for trading on the upcoming MLB slate or any other matchups this week. The schedule features compelling prediction markets, including the 52-win New York Yankees, fresh off manager Aaron Boone reaching his 750th career win, facing the Washington Nationals. Additionally, the Boston Red Sox take on a New York Mets team positioning itself as trade-deadline sellers, while the Chicago Cubs match up against the Cincinnati Reds. Let’s take a deeper dive into the details of this offer.
Polymarket MLB Promo Code STIFFS Unlocks $50 Bonus
| Polymarket Promo Code | STIFFS |
|---|---|
| New User Offer | $50 sign-up bonus |
| Terms and Conditions | 18+ and Present in the US |
| Bonus Last Verified On | July 12, 2026 |
For new Polymarket customers, securing extra capital for the upcoming baseball slate is a straightforward process. The current promotion provides a generous $50 sign-up bonus, which can be applied to any of the upcoming MLB prediction markets. Whether traders want to acquire shares on the 52-42 Chicago Cubs against Cincinnati or look for value backing the 40-55 New York Mets against the Boston Red Sox, this bonus instantly enhances trading power.
To successfully unlock the $50 bonus, simply create a new account and make an initial deposit of at least $20. This promotion is strictly reserved for first-time users. Additionally, all participants must be 18 or older and physically located in an eligible Polymarket state to claim the offer and begin trading.
Sunday MLB Matchups
| Matchup | Probability |
|---|---|
| NYY @ WSH | 51% / 50% |
| BOS @ NYM | 53% / 48% |
| CHC @ CIN | 55% / 46% |
When digging into the statistical breakdown of the CHC @ CIN matchup, it is easy to see why the Cubs are favored in the market. Chicago’s offense holds a distinct advantage, hitting .244 as a team with a .746 OPS and 444 total RBIs. In contrast, the Reds have scuffled at the plate, posting a .229 batting average, a .704 OPS, and just 372 RBIs. Chicago also maintains the edge on the mound with a 4.338 team ERA compared to Cincinnati’s 4.484 mark.
How to Activate Polymarket MLB Promo Code STIFFS
Ready to get started? Activating this Polymarket offer is a straightforward process. Just follow the steps below to claim your bonus before the first pitch:
- Create Your Account: Register for a new account by providing your standard personal information.
- Verify Your Identity: Submit a valid proof of identification to secure and verify your account.
- Enter the Code: Be sure to enter the promo code STIFFS when registering.
- Fund Your Account: Make a first-time deposit of at least $20 in order to officially activate the offer.
Once your initial deposit clears, you will be fully set up and ready to trade on the upcoming MLB slate. New players will receive $50 in bonuses to use on Sunday’s MLB slate or any other market. Polymarket will help first-time players hit the ground running this week.
