India vs India · Real-time payment systems compared
| Capability | IMPS | UPI |
|---|---|---|
| QR Code Payments | — | ✓ |
| Wallet Support | — | ✓ |
| 24/7 Availability | ✓ | ✓ |
| Cross-Border | — | ✓ |
| ISO 20022 | — | — |
| Request to Pay | — | ✓ |
| Open API | ◐ | ✓ |
| Alias/Proxy | — | ✓ |
Immediate Payment Service is India's original 24/7 real-time interbank transfer system launched by NPCI, and the foundational infrastructure that UPI was later built upon. IMPS uses MMID (Mobile Money Identifier) and mobile number for addressing, supports transfers up to INR 5 lakh, and connects banks via the National Financial Switch. While UPI has overtaken it for consumer payments, IMPS remains widely used for direct bank-to-bank transfers and backend settlement.
Unified Payments Interface is a real-time interbank payment system built on top of IMPS infrastructure, enabling instant mobile payments via QR code, phone number, Aadhaar, or virtual payment address (VPA). With 300+ participating banks and 50+ third-party apps (Google Pay, PhonePe, Paytm), UPI processes 14B+ transactions per month and has become India's dominant payment method for both P2P and merchant payments. Now expanding internationally with cross-border linkages to Singapore's PayNow and other ASEAN systems.