Digital transactions through Unified Payments Interface (UPI) have surged exponentially 77 times within a year of the demonetisation drive. The number of transactions through UPI, a payments system launched by NPCI, was very low (0.1 million in October 2016), before the Government’s decision to replace old currency notes of Rs 500 and Rs 1,000 with new notes in 500 and 2,000 denominations with a view to checking black money and promote digital transactions.