The present work aims to promote an analysis of the charging of the Convenience Fee when issuing tickets for shows and events. This study will focus on the aforementioned charging through commercial transactions carried out between consumers and suppliers within the scope of electronic commerce. As a problem, it will be discussed the legalities and abusiveness that arise from charging the convenience fee, as well as the extent to which it effectively materializes or not in a convenience to the consumer. The choice of this topic is justified because electronic commerce is already an increasingly growing reality in social relations, thus requiring specific regulations for its exercise, under penalty of violating consumerist rights recognized for more than three decades, as well as as well as the fact that the consumer class materializes into a daily active social group that involves practically the entire portion of the world's population. Thus, it will be studied to what extent consumers who gravitate towards electronic commerce find themselves even more vulnerable and hypo-sufficient in the face of contractual and obligatory impositions from suppliers, further weakening this relationship that is already born with imbalance. The aim of this research is to analyze how to seek harmonization of the constitutional principles governing the economic and financial order, once there is provision for the exercise of free competition and also for consumer protection. Thus, the emergence, development, evolution and possible abuses imposed by the charging of the convenience fee in consumer relations carried out within the scope of electronic commerce will be discussed, and the extent to which the responsibility of suppliers of products and services that participate in this relationship will be covered. consumerist, from the pre-contractual phase, through the contract phase and still seeking to protect consumerist rights in the post-contractual phase. Through a systematic literature review, the aim was to identify the main problems and violations of consumer rights, due to the charging of the convenience fee, while also analyzing legislative developments, gaps, jurisprudential developments on the subject, focusing on the assessment of the Superior Court of Justice's jurisprudence on the subject.