The primary purpose of the article is to show the role of fintech startups in the operation of project supply chain. In the first part, based on the literature review, the theoretical issues concerning the taxonomic view of supply chain and project supply chain were presented. These considerations formed the basis for designing a model of fintech startup functioning in project supply chain. The model was created based on the recent studies on fintech and young companies. The model distinguishes three basic elements: digital management, transaction business process and smart contract which determine the process optimization and the efficiency of implementing financial innovations in project supply chain. The proposed model can be a further inspiration for researchers to undertake studies in this area, while for practitioners it can be a valuable source of knowledge on the use of financial innovations created by fintech startups in business operations.