The growing adoption of UPI payment applications in India has revolutionized the financial landscape by simplifying daily transactions and encouraging a cashless economy. Grounded in the principles of sustainable development, this research examines the role of UPI apps in fostering sustainable practices. By reducing dependency on physical currency, UPI contributes to environmental sustainability through a lower carbon footprint across various business sectors. Additionally, it supports economic inclusion by facilitating seamless transactions for individuals from different socioeconomic backgrounds, particularly in rural regions, thereby empowering communities financially- a key aspect of societal sustainability. The digital framework of UPI also enhances transparency and accountability, curbing corruption and enabling more efficient governance, which are difficult for achieving institutional sustainability. The study utilizes primary data to investigate the integration of UPI with three key aspects of Sustainable Development Theory: environmental, economic, and social sustainability.  The findings reveal that the growing adoption of UPI has the potential to contribute significantly to sustainable economic growth, particularly in the context of emerging economies