Purpose: The article aims to determine the relationship between the FinTech ecosystem and ensuring a stable path of economic growth in the context of digitalization. The transition to digitalization of the financial sector is accompanied by a fundamentally new, qualitative transformation of socioeconomic relations in society. Design/Methodology/Approach: As part of the study, the concept of FinTech was considered both in the context of technological innovation and in the context of companies utilizing these innovations in business, as well as the systematization of business models of the FinTech industry. The classification of horizontal and vertical innovations of the financial industry is given. The authors presented the structure of the FinTech ecosystem as an instrument for ensuring sustainable. Findings: For the successful development of the FinTech ecosystem, the authors of the study presented a number of initiatives, the implementation of which will ensure the maintenance of the financial system stability, protection of consumer rights, as well as the digital innovations' development and implementation. Practical Implications: The formation of a sustainable digital financial infrastructure tends to ensure the effective provision of services in the financial market, including for small and medium-sized companies, which will increase the availability of financial services and promote competition in the financial sector. Originality/Value: The key contribution of the study is the ecosystem approach, which allowed determining the possibilities of safe sustainable development of the financial sector.