What Are Nostro and Vostro Accounts?

How It Works

Every time a bank needs to make or receive payments in another country's currency, it needs access to local accounts in that country. The solution is a system of accounts that banks maintain at each other. Bank A in the US maintains an account at Bank B in Japan, denominated in yen. From Bank A's perspective, this is a 'nostro' account — from Latin, meaning 'ours.' From Bank B's perspective, it holds a 'vostro' account for Bank A — 'yours.'

When a US bank needs to pay yen to a Japanese recipient, it instructs its correspondent bank in Japan (Bank B) to debit its nostro account and credit the recipient's account. No yen physically moves across the Pacific — only accounting entries change. This is the essential insight: international money movement is not the physical transport of currency but the coordinated updating of accounts that banks hold at each other.

Maintaining these accounts requires active management. A bank's nostro account needs to hold enough foreign currency to cover expected outgoing payments without holding so much that the idle funds become a drag on returns. Treasury departments at large banks spend enormous effort managing nostro account balances across dozens of currencies simultaneously — adding to their staff and overhead. Blockchain-based settlement eliminates the need for these accounts entirely by replacing bilateral account relationships with a shared ledger.

Why It Matters

Nostro and vostro accounts represent one of the most concrete inefficiencies in international finance. The global banking system maintains hundreds of thousands of these bilateral account relationships, each requiring capital to be parked in them, operations staff to manage them, and reconciliation processes to verify them. The cost of this infrastructure is ultimately passed on to customers through international transfer fees.

Estimates suggest that the global banking system has trillions of dollars tied up in nostro and vostro accounts across the world at any given moment — liquid capital that earns little or nothing while sitting idle to facilitate payment routing. Blockchain settlement, where a shared ledger replaces bilateral accounts, would free much of this capital for productive use.

Real-World Example

JPMorgan maintains nostro accounts at banks in over 100 countries to facilitate its international payment operations. If JPMorgan needs to pay euros to a European bank, it instructs its euro nostro account at a European correspondent to make the payment. The account balance at the European correspondent decreases; the recipient's account increases. JPMorgan's euro balance is now lower — its treasury department needs to replenish it, either by receiving euro payments from other clients or by converting dollars to euros. Managing this across 100+ currencies is a major operational undertaking.