The UPG layer involves complex cross-chain messaging. If a bridge or relayer smart contract has a bug, funds could be drained. Look for UPG-PaymentICO projects with multiple audits (e.g., CertiK, Trail of Bits).
: For online trials, consider using disposable virtual card numbers that can be paused or deleted immediately after the initial sign-up. upg-paymentico
: Users reporting access to their accounts and unauthorized billing. The UPG layer involves complex cross-chain messaging