What is a User ID (UID) and can I change it? August 05, 2026 09:21 Updated A User ID (UID) is the unique identifier of a CAEX account, which is automatically generated by the system during registration. The UID cannot be modified and is used to identify your account across the entire system. Related articles What is Two-factor Authentication (2FA)? Is it mandatory to complete KYC before depositing Crypto? Does changing my account information affect withdrawals? How can I check block confirmations for my Crypto Withdrawal? Which Crypto Assets and Blockchain Networks does CAEX support for Crypto Deposits?