Why
The news is real and the conclusion attached to it usually is not, which is why this belongs in the catalogue rather than in a bookmark. India's central bank governor has said BRICS is weighing links between national fast-payment systems and CBDCs — UPI and CIPS are the systems named — and the reporting is explicit that this is early-stage, with technical, regulatory and governance hurdles outstanding. What the reporting does not contain is any public chain. Every "and this is where chain X becomes extremely relevant" post supplies that step itself, and the gap between the sourced claim and the appended one is the same gap the rwa-multichain card was written to record. So the question worth building around is not whether a particular ledger wins a mandate, but the prior one: when you connect N national payment systems, what actually has to be shared? Break the work into addressing and routing, FX price discovery, liquidity and prefunding, and final settlement, and most of it is a messaging and standards problem that BIS Project Nexus already solves with a hub-and-spoke model and no ledger at all. The one leg where a shared ledger has a genuine argument is settlement atomicity: across time zones neither bank wants to pay first, and that Herstatt exposure is what correspondent banking handles worst.
How it works
The comparison has a built-in baseline, which is what makes it measurable rather than speculative. Nexus is the no-ledger arm: a multilateral hub so each domestic instant-payment system makes one connection instead of N-squared bilateral ones, with a prototype that connected the test systems of the Eurosystem, Malaysia and Singapore and let payments be addressed by mobile number, now extending across ASEAN. That is the bar. mBridge is the ledger arm: a chain built by central banks for central banks for multi-currency CBDC settlement, at minimum-viable-product stage as of 2024 — and the question to put to it is not whether it works but what it bought over the hub. The measurable core is the prefunding number. Correspondent banking's real cost is not the fee, it is nostro and vostro balances parked in every corridor to cover settlement risk, and that capital is idle by construction. Model one corridor with and without atomic payment-versus-payment, and the difference in required prefunded liquidity, derived from corridor volume, settlement lag and FX volatility, is a figure that decides the argument rather than restating it. Only after that is there a fair way to assess a specific chain. XRPL's relevant features for this are the native DEX with auto-bridging and escrow, which target the FX and PvP leg rather than the messaging leg — so the honest comparison is that leg against a Nexus-style hub plus existing RTGS, and it is not the comparison the promotional posts make. One constraint belongs in the card so the measurement does not mislead: adoption here is decided by governance rather than throughput. Who operates the hub, whose currency bridges, what happens under sanctions, and whether a member can be excluded are the questions that have historically settled which rail wins, and a card that measured only latency and cost would be measuring the wrong thing. Reads alongside tokenized-money-banks, which asks the balance-sheet half of the same subject.