The extension means the Polymarket invite code CUSE is no longer tied to a single game or league. How to Use the Polymarket Invite Code CUSE:Activating the Polymarket invite code CUSE takes only a few minutes. Select Sign Up and enter the Polymarket invite code CUSE in the referral/invite field during registration. Polymarket Invite Code. All verified Polymarket invite codes active as of July 29th:Publication Polymarket Invite Code Syracuse.com CUSE MassLive.com MASS OregonLive.com OREGON Cleveland.com CLEVE SILive.com SILIVEHow the Polymarket Invite Code CUSE Compares to Other Platforms:Polymarket US operates differently from traditional sportsbooks or sweepstakes platforms.