Kalshi , one of the leading prediction markets in the industry, is giving new users a bonus to sign up with the  Kalshi promo code   NYPMAX . Opening Day is just over a month away. You can apply the promo code to any market on the platform, including on futures for the 2026 MLB season. How to use the Kalshi referral code Kalshi is offering readers of the Post a $10 bonus when they create an account on the platform. Upon sign-up, new users must enter the  Kalshi promo code   NYPMAX , verify