Polymarket and Kalshi unveil MLB trading promo codes for US users

Polymarket introduced several invite codes—including ALCOM and CUSE—that grant a $50 bonus (raising a new user’s balance to $70 after a $20 deposit). The offers apply to MLB games scheduled for July 19‑21 2026, such as the Red Sox vs. Orioles, Dodgers vs. Yankees and other match‑ups. Eligibility is limited to new U.S. accounts, with some codes (e.g., CUSE) specified for states like New York, Pennsylvania and Wisconsin.

Kalshi released promo codes ELITE15, MASSLIVE1, OREGONLIVE1 and SILIVE, providing bonuses from $10 to $15 for first‑time traders who meet a $10 trade or deposit requirement. These codes are also tied to the same July MLB slate and are valid in a broad set of U.S. states under CFTC regulation.

Both platforms market the promotions as regulated alternatives to traditional sportsbooks, highlighting transparent pricing and the ability to trade on real‑world outcomes rather than fixed‑odds bets.