The article analyzes the role of the largest contract fair in the socio-economic development of Kyiv and Ukraine. The relevance is determined by the state of the historiographical situation regarding the socio-economic development of commodity-money relations that arose on the basis of an artificially created important trading area in Kyiv and dominate modern pro-European perspectives. The authors present the key concept of «contract fair» as a trading area for commodity-money and exchange relations. Based on the collected factual material, the main factors of the contract fair’s impact on the socio-economic development of Kyiv, as well as the conscious perception/understanding of reality by the population, the inclusion of Kyiv residents, Ukrainians and visitors in the life of the city, and changes in its infrastructure are highlighted. It is proved that an important element of Kyiv’s use in the socio-economic development of the Right Bank of Ukraine is its convenient geographical location. Kyiv was an important administrative unit of Ukraine in the historical period studied by the authors. Its status has been preserved to this day. The convenient location of the city and the interest of the Kyiv administration in developing trade relations contributed to the expansion of international relations between city traders and foreign trade institutions. The Russian Empire and Napoleon also had mixed interests in using Kyiv to their advantage. For the Russian Empire, it was an important strategic outpost in the Southwestern region, which served as a military base for Russia’s expansion to the south against Turkey; the spiritual center of East Slavic Orthodoxy. For Napoleon, it was an important military strategic direction. The socio-economic role of the contract fair is important for the development of interethnic trade and monetary relations and the further development of Kyiv. The presented scientific conclusions and generalizations are based on the study of archival materials, sources and literature of the late 18th and early 19th centuries.