Redeem our Action Network Polymarket sign up bonus now to trade on a pivotal Game 4 in the Rays vs. Guardians series (6 p.m. ET on TBS/truTV). Register for an account using Polymarket promo code ACTION and deposit $10. This act triggers $25 in tradable bonus funds, no prior trade involving your own money required.
I signed up with this offer myself when it became available, and not having to risk any of my own money up front is why I rank the Polymarket sign up bonus as one of the top MLB prediction market promos on the board.
Learn more about why the Polymarket offer tops that of their competitors, along with my Rays vs. Guardians prediction to trade below.
Polymarket Sign Up Bonus in Simple Terms
I encourage all eligible MLB fans to claim the Polymarket sign up bonus because it provides a user friendly way to begin trading the ALCS tonight:
- Polymarket doesn't require you to trade any of your money after registration
- Once you deposit $10, you automatically get $25 in site credit to trade with
- Apply your $25 in bonus funds on your most confident Rays vs. Guardians predictions
In comparison, most prediction market apps I have accounts on didn't give me this nice a welcome bonus. They either required trades like $25 or $50 involving my own money, or didn't give me a bonus as valuable as $25.
Steps to Claim Polymarket Promo Code ACTION
No matter the state you're in or the device you're signing up from, the steps below that Action Network colleague Alan Walsh and I used to claim the Polymarket sign up bonus will work for you.
- Tap here to begin registration at Polymarket today, Friday, Oct. 16, 2026.
- Type in your personal information and have your location identified.
- Insert Polymarket promo code ACTION in the prompted field.
- Make a $10 deposit using one of the available banking methods.
- See the $25 bonus land as soon as your deposit clears.
Tip: Want help understanding your potential payouts as a first time prediction market user? Use the Action Network prediction market odd calculator to give yourself an assist.
Rays vs. Guardians Prediction
After you claim the Polymarket sign up bonus, Game 4 in the ALCS between the Guardians and Rays sticks out as the top game to trade prediction markets on.
Cleveland hands the ball to lefty Joey Cantillo (3.62 ERA, 3.98 FIP) for Game 4, while Tampa Bay’s choice is still shaking out. Griffin Jax was tabbed as the surprise Game 3 starter over Nick Martinez, leaving Martinez as the logical Game 4 option.
Polymarket MLB odds are close to being an even split. I avoid picking a winner or spread pick in this one tonight. Instead, I look at Tampa’s pitching and bullpen depth. With a well-rested Martinez opposing Cantillo in a pitching-friendly environment, I expect a low-scoring affair. My Rays vs. Guardians prediction is over 6.5 runs NO (48¢)
18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See 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.
