A Revolution Built on 'Free'
Launched in 2016, UPI’s growth has been nothing short of explosive. By mid-2026, the platform was processing over 23 billion transactions a month, making it the world's largest real-time payment system. This success was no accident. It was fueled by a deliberate
government policy decision made in January 2020: the implementation of a zero Merchant Discount Rate (MDR). In simple terms, MDR is the fee merchants typically pay to their bank or payment provider for processing a digital transaction. By eliminating this fee for UPI, the government removed the biggest obstacle for small merchants, from chai wallahs to neighbourhood kirana stores, to accept digital payments. This masterstroke drove unprecedented adoption among both consumers and businesses, turning UPI into critical public infrastructure.
The Billion-Transaction Problem
While the zero-MDR policy was a victory for digital inclusion, it created a fundamental business paradox. The companies that build and maintain the UPI ecosystem—including banks and third-party app providers (TPAPs) like Google Pay and PhonePe, which together process the vast majority of transactions—earn nothing from the core service they provide. Yet, running this massive infrastructure is not free. Behind every instant payment are significant costs for servers, cybersecurity, fraud detection, and inter-bank settlement. Banks and payment companies found themselves in a position where their costs increased with every new transaction, while their revenue from those transactions remained zero. This has led to what many in the industry call an unsustainable model, where immense volume does not translate to profitability.
The Hunt for Revenue
With the primary service being a loss-leader, payment apps have been forced to get creative. Their strategy has shifted from being simple payment pipes to becoming comprehensive financial 'super-apps'. The real business model for these platforms is not the transaction itself, but what they can sell around it. They leverage their massive user bases to cross-sell other products, earning commissions on services like bill payments, mobile recharges, ticket bookings, insurance policies, personal loans, and mutual fund investments. For merchants, they offer value-added services like the popular 'Soundbox' devices for an installation or rental fee, or traditional payment gateway services for online businesses that bundle UPI with other chargeable payment methods like credit cards.
A Sustainable Path Forward?
The unsustainability of the zero-MDR model has become a major topic of discussion among policymakers. The government has partially compensated the ecosystem through incentive schemes, but these have been inconsistent and viewed as inadequate to cover the true costs. As of mid-2026, legislative changes have opened the door for reintroducing a form of MDR. The consensus is that any new fee structure will be carefully targeted to avoid hurting small users and merchants who drove UPI's success. Proposals being considered include applying a nominal fee only on high-value transactions (for example, over ₹2,000) or on payments to large merchants with high annual turnover. The goal is to balance the accessibility that made UPI a public good with the financial viability needed to ensure its long-term health and security.
