"Cross-border real-time payment linkages can lower remittance costs but raise regulatory challenges." Critically analyse.

Cross-border real-time payment linkages connect two domestic fast-payment systems so funds move instantly across borders. India's UPI — recognised by the IMF as the world's largest real-time payment system, with about 49% of global real-time transaction volume [4] — has become the vehicle for this, from UPI-PayNow (2023) to the UPI–KHQR linkage with Cambodia (2026) [1][3]. The gains are real, but they outpace the regulatory scaffolding.

Cost and efficiency gains

• Bypasses correspondent banking: linking UPI directly with Singapore's PayNow cut the layers of intermediary banks that inflate charges on the over US$1 billion flowing annually between the two [3].
• Lower merchant-payment costs: Indian travellers scanning KHQR at Cambodian merchants avoid card-network fees and cash conversion [1].
• Speed and transparency: real-time settlement directly serves the G20 Roadmap for Cross-Border Payments objectives of cost, speed, transparency and access [5].
• Strategic dividend: UPI acceptance across UAE, Singapore, Nepal, Bhutan, Sri Lanka, France, Mauritius and Qatar makes DPI an instrument of economic diplomacy and Act East outreach [2].

Regulatory challenges

• Fragmented mandates: linkages rest on bilateral central-bank cooperation (RBI–NBC) rather than treaty, leaving settlement and FX-conversion mechanics to later phases [1].
• AML/CFT and data risks: instant, irreversible transfers compress the window for screening; data-localisation norms differ across jurisdictions.
• Purpose and limit restrictions: UPI-PayNow permits only P2P remittances for family maintenance and gifts, capped at ₹60,000 per day, showing how prudential caution throttles scale [5].
• Architectural mismatch: UPI is account-based, while Cambodia's Bakong is distributed-ledger based — interoperability demands sustained technical and supervisory alignment [1].
• Consumer protection: cross-border grievance redress and dispute resolution remain thin.

Thus the cost advantage is proven, while the regulatory framework is still catching up — a sequencing gap, not a contradiction. A phased path — harmonised KYC-AML standards, clear FX and settlement rules, and a bilateral dispute-redress mechanism, anchored in the G20 Roadmap — can convert these pilots into durable corridors. Handled so, UPI's internationalisation advances both financial inclusion and India's economic diplomacy.