Abstract
In e-commerce Fair Exchange protocols are used to assure the correct execution of transactions, and to provide evidence in case of dispute. Even though many of those transactions involve the use of Intermediaries, the protocols are designed to provide Fair Exchange between two transacting parties, leaving the possible intermediaries out of the scope. In this paper we propose a Fair Exchange protocol for agent-mediated scenarios. We first present our model for agent-mediated scenarios and its requirements, we illustrate its usage with a motivating example, and then we present our proposal with a brief security analysis.