Unified Payments Interface (UPI) transaction volumes remained above the 24-billion mark in September despite easing 1.8% from the previous month, according to data released by the National Payments Corporation of India (NPCI), underscoring the continued dominance of instant digital payments even as concerns over a possible Merchant Discount Rate (MDR) have resurfaced among traders.
The moderation came after exceptionally high transaction activity in recent months and does little to alter UPI's broader growth trajectory. However, the latest numbers arrive at a sensitive moment for the digital payments ecosystem, with merchant organisations raising concerns over reports that MDR could be introduced on certain UPI merchant transactions from October 15.
Volume eases marginally
UPI processed more than 24 billion transactions during September, down 1.8% sequentially. The decline followed a strong August and needs to be viewed partly against the difference in the number of days between the two months.
On a daily basis, transaction activity remained extremely high, reflecting UPI's increasing use for routine payments ranging from grocery purchases and restaurant bills to utility payments, online shopping and person-to-person transfers.
The platform has expanded rapidly beyond its original role as an alternative to cash and cards. For millions of consumers and small businesses, QR-based UPI payments have become a default transaction method because of their speed, interoperability and ease of use.
MDR debate returns
The latest data coincides with renewed debate over MDR, the fee paid by merchants for processing certain digital transactions.
Merchant associations have expressed concern over reports of an MDR being introduced from October 15, particularly for higher-value UPI merchant transactions. Traders argue that any additional transaction cost could disproportionately affect businesses operating on thin margins and potentially discourage smaller establishments from accepting digital payments.
The concerns are particularly significant because zero-MDR UPI payments have played an important role in encouraging widespread adoption among small merchants. A shopkeeper can currently accept an eligible UPI payment without having a percentage of the transaction deducted as a merchant fee.
Any change to that structure would therefore have implications not only for banks and payment companies but also for millions of businesses that have built their payment systems around UPI.
No fee for customers
The MDR debate should be distinguished from charges on consumers. MDR, where applicable, is a merchant-side payment acceptance charge rather than a direct fee imposed on a customer merely for making a UPI payment.
The distinction has become important amid concerns that the introduction of merchant charges could be interpreted as the end of free UPI transactions for ordinary users.
The central question is instead how the cost of maintaining the UPI ecosystem should be distributed among banks, payment service providers, merchants and the government without undermining the widespread acceptance that has made the platform successful.
Cost of rapid expansion
UPI's extraordinary growth has increased the infrastructure requirements for banks and payment companies. Every transaction requires processing, authentication, fraud monitoring, cybersecurity infrastructure and settlement systems, even when no direct transaction fee is collected from the merchant or customer.
Banks and payment companies have consequently argued at different points that a sustainable revenue mechanism is necessary to fund infrastructure and maintain service quality as volumes continue to increase.
The government has so far supported the zero-MDR framework for eligible UPI transactions through incentive schemes designed to compensate parts of the payments ecosystem, particularly for low-value transactions.
The policy challenge is balancing those costs against the objective of keeping digital payments affordable enough to encourage continued adoption.
Small merchants watch closely
For small retailers, street vendors and service providers, UPI's zero-cost acceptance model has been central to its appeal. Businesses need little more than a bank account and QR code to receive payments, avoiding the hardware and transaction charges traditionally associated with card acceptance.
Merchant groups fear that even a relatively small percentage charge could become meaningful when applied across thousands of transactions every month.
The impact would also depend heavily on how any MDR framework is designed. A structure limited to larger merchants or higher-value transactions would have different consequences from a universal charge covering all UPI payments.
Any exemptions based on merchant turnover, transaction value or business category would therefore be closely watched.
UPI remains dominant
Despite the policy debate, September's numbers show little evidence of a fundamental slowdown in UPI usage. Remaining above 24 billion monthly transactions after years of rapid expansion demonstrates the depth to which the platform has become embedded in India's retail payment system.
The scale also means that even modest changes in transaction charges could have substantial consequences when spread across billions of payments.
For policymakers, the challenge is increasingly shifting from driving UPI adoption to ensuring that the system remains financially sustainable, technologically reliable and affordable for merchants and consumers.
September's modest 1.8% sequential decline is therefore less significant than the broader picture: UPI is continuing to process more than 24 billion transactions a month. The more consequential question for the coming weeks will be whether the economics underpinning those transactions are about to change.