NPCI 0.4% UPI Fee Sparks Bill-Splitting Hacks as Developers Exploit Sub-₹2,000 Exemption

The National Payments Corporation of India's (NPCI) decision to introduce a 0.4% Merchant Discount Rate (MDR) on Unified Payments Interface (UPI) merchant payments above ₹2,000 has ignited unexpected grassroots technological resistance. Within hours of the announcement, Indian developers began publishing software tools designed to circumvent the surcharge through automated transaction slicing.

A prominent open-source proof-of-concept named SplitPe, built by developer Aman Tiwari and shared on Reddit's r/IndiaFinance, gained widespread traction by showing how merchants and shoppers can mathematically eliminate MDR costs. By programmatically breaking down a single merchant invoice—such as a ₹7,500 retail bill—into four consecutive sub-₹2,000 tranches, the tool allows users to settle transactions without crossing the fee threshold, circumventing a ₹30 payment processing cost.

The Architecture of the New UPI Fee

Under the NPCI circular issued in September 2026, transactions routed over UPI face new economic rules starting October 15:

• Person-to-merchant (P2M) transactions exceeding ₹2,000 will incur a standard MDR of 0.4%, capped at ₹300 for payments of ₹75,000 and higher.
• Transactions under or equal to ₹2,000 remain completely exempt, carrying a mandatory 0% MDR.
• Peer-to-peer (P2P) transfers between individuals remain entirely free of charge.
• Micro-vendors categorized under the Person-to-Person Merchant (P2PM) framework receiving up to ₹1 lakh per month retain zero-MDR status.
• Specialized segments—such as fuel, railways, utilities, and telecom—are assigned flat ₹5 fees rather than percentage cuts.

The fee split is structured to distribute MDR among ecosystem participants: acquiring banks retain 0.12%, issuing banks receive 0.16% in interchange, payment service providers (PSPs) take 0.04%, and third-party app providers (TPAPs) earn 0.08%.

The Rise of Programmatic Bill-Splitting

Because NPCI’s framework draws a hard boundary at ₹2,000, market participants have noted an immediate incentive for "smurfing" or bill-splitting. The SplitPe concept provides dual interfaces to operationalize this loophole:

Counter POS Mode: Merchants can generate dynamic, consecutive sub-₹2,000 QR codes on an existing terminal, accompanied by a virtual audio soundbox alert that verifies payments until the total invoice is cleared.

Smart Payer Mode: Consumers scan a conventional static QR code and allow the application to generate multiple sub-₹2,000 payment intents consecutively to bypass merchant charges.

While built as an educational experiment and algorithmic concept, the project highlights practical compliance and behavioral friction. Although the Department of Financial Services has stated that merchants cannot legally pass the 0.4% surcharge on to retail consumers, merchant bodies and traders in wholesale hubs like Delhi's Sadar Bazaar have pointed out that informal retailers often seek to recoup processing fees via price markups or split transactions.

Market Implications for Payment Aggregators and Banks

The emergence of bill-splitting mechanisms presents both technical and financial questions for listed payments firms, including One97 Communications (Paytm) and MobiKwik.

Fintech shares rallied after the NPCI confirmed that monetisation would return to high-value merchant volumes, supporting network infrastructure and cybersecurity investments estimated at ₹20,000 crore annually across the banking sector. However, if mid-tier and large merchants deploy software-driven payment chunking, transaction counts could multiply while the expected MDR revenue pool faces compression.

Furthermore, rapid-fire sub-₹2,000 payments on identical terminal IDs could trigger anti-structuring alerts or risk-scoring flags from core banking systems and the Reserve Bank of India's fraud monitoring networks. As the October 15 implementation deadline approaches, payment aggregators may urge NPCI to deploy transaction-grouping algorithms on UPI switches to prevent client-side fee evasion.

Tags: National Payments Corporation of India Reserve Bank of India Unified Payments Interface Paytm MobiKwik FinTech