Abstract: A credit card fraud-prevention system which allows user accounts to customize a personal portfolio to monitor their individual transactions. The system allows each user account to pick a plurality of fraud-prevention criteria to monitor a payment card(s). The overall process begins with receiving payment transaction data with a remote server. A matching account is then identified for the payment transaction data by searching through a card identification information of each user account. Once the matching account is identified, the remote server then compares the payment transaction data to each fraud-prevention criteria in order to identify a met criterion. If the met criterion is not identified, then the payment transaction data is verified and sent to financial entities. If the met criterion is identified, then a predefined response of the met criterion is executed. This includes notifying the matching account about the possible fraudulent activity and requesting verification for the transaction.