# X_CURRENCY_UNKNOWN

## Means

currency code not in the currency table

## Typical cause

a lowercase code — the lookup is exact — or a currency the shipped rows do not carry. **53 ISO-4217 rows** ship, at [`packages/money/src/currency.ts:21`](https://github.com/developerz-ai/ultimate/blob/main/packages/money/src/currency.ts), and `As of 2026-08` they are not the whole set: `registerCurrency()` adds a row for this process, and `currencyCodes()` answers with those registrations included. Also raised where there is no currency at all to infer — `sum([])` over an empty array

## Fix

`assertCurrency('EUR')` with a code `currencyCodes()` lists, uppercased; `sum([], 'EUR')` where nothing can be inferred — or declare the missing currency once at boot: `registerCurrency({ code: 'XBT', exponent: 2, name: 'XBT' })`

[i18n, money, time](/error-codes#i18n-money-time)