Though the MLB season is just underway, baseball fans interested in trading on baseball markets can utilize the Kalshi promo code NYPMAX . Use the Kalshi promo code NYPMAX to get a trade $10, get $10 bonus offer . This promotion is perfect for upcoming MLB games, such as the Yankees vs. Mariners on Wednesday. Aaron Judge and New York take on Seattle in the final game of a six-game road slate to start the season. The Bronx Bombers will return home to Yankee Stadium to host the Marlins on Friday.