A system and method for facilitating a value exchange transaction. A first party initiates the transaction by selecting or providing an identifier of another party and the value to be exchanged. The second party may be identified by a pre-existing identifier such as an electronic mail address, telephone number, etc. The system informs the second party of the transaction (e.g., using the specified pre-existing identifier). If the second party is not a registered user of the system, he or she is invited to register and complete the transaction. The system may comprise a synchronization server for exchanging transaction details with users' devices, a communication server for registering new users and/or conducting transactions online and a financial server for interacting with external financial institutions.