A new Polymarket promo code, "SILIVE", has been introduced, which appears to upgrade a $50 referral promo. The promo's timing coincides with various sporting events, including MLB games such as Liberty-Wings and Yankees-Pirates, although some reports mention different events like the World Cup or refer to a different code, "CUSE", or a different platform, Kalshi, with a $10 referral code. The specifics of the promo and its application are not entirely clear across the different reports.