https://theprint.in/opinion/upis-rapid-growth-proves-india-can-build-world-class-payments-infrastructure-from-scratch/355480/

The Unified Payments Interface crossed a billion transactions a month in 2019, and is now up to 1.3 billion transactions a month. In the three years since its launch, the UPI has become one of the fastest-growing payment platforms in the world and has attracted attention from global policy-makers. It is now regarded as an important institutional and public policy innovation.