"India's Digital Public Infrastructure has emerged as a tool of economic diplomacy." Discuss with reference to UPI's internationalisation.

Digital Public Infrastructure (DPI) — open, interoperable digital rails like Aadhaar, UPI and DigiLocker — has moved from domestic governance to foreign policy. With UPI live in over eight countries [2] and recognised by the IMF as the world's largest retail fast-payment system [4], India now exports its payment stack as an instrument of economic diplomacy.

UPI as an economic diplomacy instrument

• Corridor-building: the UPI–PayNow linkage with Singapore (February 2023) was India's first real-time cross-border payment linkage, cutting remittance cost and time [3][5].
• Neighbourhood and Act East reach: NPCI International (NIPL) and ACLEDA Bank enabled UPI acceptance at Cambodian merchants via KHQR, Cambodia's national QR on the Bakong system, launched in Phnom Penh with the NBC Governor and RBI present [1].
• Trade and traveller gains: QR acceptance abroad lowers foreign-exchange and card-network costs for Indian tourists, students and businesses [1].
• Normative influence: India offers DPI as a public-good, low-cost alternative to proprietary Chinese and Western payment platforms, supporting the G20 cross-border payments agenda [5].

Limits of the instrument

• Partial linkages: the Cambodia rollout is only Phase 1 — outbound acceptance for Indian travellers; the two-way leg and settlement mechanics await Phase 2 [1].
• Regulatory friction: differing KYC/AML norms, FX-settlement rules and data-localisation demands slow scaling; central-bank MoUs lack treaty enforceability [5].
• Architectural heterogeneity: UPI's account-to-account model must interoperate with distinct systems such as Bakong's distributed-ledger design, raising technical and dispute-resolution costs [1].
• Volumes remain modest relative to domestic UPI usage, so influence is currently symbolic as much as material.

UPI's overseas expansion shows that infrastructure, not aid alone, can carry diplomatic weight — building goodwill, commercial linkages and standard-setting power together. Completing two-way corridors, harmonising settlement rules and bundling UPI with wider India Stack offers would convert this soft-infrastructure lead into durable economic partnership, advancing both India's Act East engagement and the shared goal of cheaper, faster global payments.