Nexus Smart Pay has changed its name to ebb. Please visit www.ebblink.com to see our exciting changes. Nexus Smart Pay is a biometric-only electronic payment system designed for execution of payments at physical retail points of sale. The Nexus goal is to offer both consumers and merchants a paradigm improvement in convenience and security. Nexus Smart Pay is the world's only biometric-only payment system in active deployment in a real commercial marketplace.