The purpose of this thesis is to analyze the formation of contracts concluded by electronic agents both in the European Union and the United States. Technology is in constant evolution and the possibilities offered by electronic agents today are far from the ones that could be developed tomorrow. Thus, law faces a permanent challenge to adapt itself to these changes. This paper aims to show that the existing principles do not provide an appropriate legal frame for this new type of contract. In addition, since legislatures have attempted to regulate this new way of doing business, this thesis analyzes the possible development of a new set of rules. To achieve that goal, a just balance between protecting users and ensuring the freedom necessary to businesses needs to be found.