Sign up with an account and enter the Polymarket promo code ACTION to claim the best MLB prediction market promo of $20 in tradable bonus funds. Insert $10 into your account once you complete registration to claim the $20 bonus ahead of Mariners vs. Yankees (7:05 p.m. ET on TBS), or any MLB game on the docket today, Tuesday, Aug. 11, 2026.
I have experience with all the best prediction market promos in the industry, and Polymarket stands out above their competitors. Polymarket is the only prediction market which offers bonus funds before requiring a submitted trade. Join Polymarket now to start your overall account balance with $20 on the house.
| Offer | Information |
|---|---|
| Promo code | ACTION |
| Offer | Deposit $10, get $20 bonus |
| Minimum deposit | $10 |
| Qualifying trade required? | No |
| Starting balance | $10 deposit + $20 bonus |
| Eligible markets | MLB, NFL, sports, etc. |
| Bonus can be split across markets? | Yes |
| Age requirement | 18+ |
| Excluded states | AZ, IL, MA, MD, MI, MT, NV, OH |
| Platform | Polymarket US app (CFTC-regulated exchange) |
Polymarket Promo Code ACTION Sign-Up Steps
Polymarket gave me one of the quickest registration flows amongst all prediction market apps. Here are the steps I followed which you need to do in order to make an account today:
- Click a sign-up link in this article to download the Polymarket US app on your device.
- Enter prompted information such as your name, address, phone number and SSN.
- Enter Polymarket promo code ACTION in the correct box.
- Make an initial deposit of $10+ to pocket $20 in tradable bonus funds.
- Put your $20 trading credit on MLB tonight, including Mariners vs. Yankees.
Mariners vs. Yankees Predictions to Trade
To help you make a Mariners vs. Yankees prediction, I consulted Action Network betting experts. Jon Anderson has staked his claim on Yankees to win YES (-125) for the following reasons:
"I like the Yankees to see and hit Woo well here. The Yankees have some left-handed power hitters who love hitting at home, and Woo gives up a lot of fly balls. And I also really like what we're seeing with Weathers and his home run suppression. The Mariners lineup is built on hitting the long ball, that hasn't happened much this year, and Weathers has a pitch mix that keeps the ball on the ground now."
The Mariners enter this game on a 3-7 skid over their last 10 games, and pitcher Bryan Woo has struggled on the road (6.71 ERA, 1.49 WHIP). I agree with Anderson that Woo provides a good matchup for a Yankees offense that has home field advantage tonight.
Remember that Polymarket promo code ACTION is responsible for you starting out with $20 in tradable bonuses to use on this matchup. Just deposit $10 to immediately unlock the $20 bonus, no trade required.
Bottom Line: Secure Best MLB Prediction Market Promo With Polymarket Promo Code ACTION
If you seek the best prediction market promo ahead of the Mariners and Yankees face-off tonight, you need look no further than Polymarket promo code ACTION. Here is a list of reasons I encourage you to sign up after having made MLB trades myself using the $20 in bonus funds:
- No other prediction markets give you guaranteed rewards without needing to trade beforehand.
- Split up and divide your $20 bonus into as many individual trades as you want on MLB, sports, weather, politics, and more.
- Once you gain access to Polymarket, an immersive catalogue of prediction markets are eligible to be traded on across every MLB game.
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.
