The article substantiates the fundamental impact of information asymmetry on the emergence and development of financial intermediation, the historical significance of uncertainty for the creation of an operational space for a financial intermediary is demonstrated. Features of the performance of a financial intermediary in the context of optimizing information asymmetries to ensure its complementary interaction with the client have been defined. It has been proven that the factor of historical institutionalization of financial intermediary is the market communication of the actors in the international exchanges in a state of shortage of information and liquidity, under circumstances of the full professional closure of the space for financia...