India vs United States · Real-time payment systems compared
| Capability | IMPS | RTP |
|---|---|---|
| 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.
The first modern US instant payment system, operated by The Clearing House (owned by 22 of the largest US banks). RTP launched in 2017 and supports credit transfers up to $1M with immediate finality — no chargebacks or returns. It also offers Request for Payment (RfP) messaging for bill pay and invoicing. While FedNow provides Fed-backed infrastructure, RTP has a head start with broader bank connectivity and higher transaction limits, and processes the majority of US instant payment volume today.