Boom and Polymarket launch MLB bonus promos

Boom's fantasy sports platform offers a welcome promotion that gives new users $55 in free MLB lineups after they place a $5 play. To qualify, users must deposit at least $10, be 18 or older, and be located in one of the eligible U.S. states listed in the offer.

Polymarket, a prediction‑market site, provides a separate sign‑up bonus of $50 when new users deposit $20. The offer also requires participants to be at least 18 years old and physically present in an eligible U.S. state. Both promotions are tied to upcoming MLB games and are intended to encourage new customers to engage with the platforms' betting and prediction services.