This article examines the trend, pattern and rate of adoption of the Unified Payments Interface transactions in India. For estimating the results, the study utilises the generalised modified exponential function, which allows for more flexible S-shaped curves. Based on data from the National Payments Corporation of India, the number of UPI transactions is likely to increase more than sixfold in a span of five years’ period. The predicted rapid growth in UPI transactions has significant implications for the payments app developers, internet service providers, the NPCI, and the UPI regulator—the Reserve Bank of India.