India’s Unified Payments Interface (UPI) has entered its second decade by acquiring something it was designed to suppress: a transaction price. From October 15, the National Payments Corporation of India (NPCI) will levy a 0.4 per cent Merchant Discount Rate (MDR) on Person-to-Merchant (P2M) UPI payments above Rs 2,000, capped at Rs 300 for transactions of Rs 75,000 and above, with a flat Rs 5 charge for railways, telecom, insurance, and fuel. Consumers and every Person-to-Person (P2P) transfer, regardless of size, remain untouched.

The announcement revives a decade-old argument: was India’s most celebrated public good ever truly free, and does charging for it now threaten the cashless economy it was meant to build? UPI’s first decade was extraordinary by any measure. Annual transactions rose from roughly 2 crore and worth Rs 0.07 lakh crore in FY17 to 24,162 crore worth Rs 314 lakh crore in FY26 – around 12,000-fold rise in volume and roughly 4,500-fold rise in value. The corresponding fall in average ticket size, from about Rs 3,900 to roughly Rs 1,300, shows UPI displacing small daily cash purchases as much as it enabled big-ticket digital ones. UPI now accounts for around 85 per cent of India’s digital-payment volume. Transactions above Rs 2,000 make up barely 4 per cent of merchant-payment volume but around two-thirds of its value – the statistical skew that lets NPCI claim 96 per cent of merchant transactions are unaffected.

That is true, but it elides the difference between MDR’s statutory and its economic incidence: a merchant who formally bears the levy may still recover it through higher prices or thinner discounts. UPI’s first decade subsidised........

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