UPI has been hailed as a global benchmark for Digital Public Infrastructure. Examine India's DPI model and its replicability for other developing countries.

Digital Public Infrastructure (DPI) means shared, interoperable digital building blocks on which markets and welfare delivery can be built. The IMF's working paper Stacking up the Benefits (2023) treats India Stack as world-class DPI — and locates its lesson in design choices, not technology [5].

Anatomy of the Indian model

• Three stacked layers — identity (Aadhaar), payments (UPI, Aadhaar Payments Bridge, AePS) and data exchange (DigiLocker, Account Aggregator) — each reusable by any provider [5].
• Public rails, private innovation — NPCI operates the switch under RBI regulation; fintechs access UPI only by partnering with a licensed bank, expanding competition while retaining stability oversight [5].
• Free at the point of use — zero MDR since January 2020, anchored in Section 10A, PSS Act, 2007 and Section 269SU, Income-tax Act, 1961; P2P is free and roughly 96% of merchant transactions by volume stay outside any MDR [1].
• Subsidy substitutes for pricing — a ₹1,500 crore incentive scheme compensates acquiring banks for low-value P2M transactions [3].

Why it reads as a benchmark

• UPI accounts for about 49% of global real-time payment transactions, ahead of Brazil, Thailand and China [2].

What actually travels — and what does not

• Replicable: the design logic — minimal shared blocks, open APIs, mandated interoperability, and a regulator willing to enforce it [5]. This needs no Indian-scale market.
• Fiscally conditional: "free" rests on recurring budgetary support. RBI's own Discussion Paper on Charges in Payment Systems holds that providers must earn income to fund operations and new technology [4]; a flat corpus thins as volumes grow [3].
• Institutionally demanding: foundational ID coverage, mobile-banking penetration and credible data-protection capacity are preconditions many states lack.

India's model shows that inclusion scales when infrastructure is treated as a public good rather than a product. Its export value lies in the architecture, not the subsidy — countries should adopt the interoperable-building-block approach while pricing sustainability transparently, aligning with SDG 8.10 on universal financial access.