Currency.getAvailableCurrencies() (JVM/Android) and NSLocale.ISOCurrencyCodes
(iOS/macOS) return every ISO 4217 code the platform has ever known about —
withdrawn currencies like the Deutsche Mark and French Franc, and test/
placeholder codes (XTS, XXX), included. Measured on the JVM: 232 total
codes, only 156 still assigned to a country.
Filters the list down to currencies actually assigned to an ISO country
today, which drops the withdrawn ones without needing a maintained
exclusion list. Precious metals (XAU, XAG, XPD, XPT) are added back in
since they're still actively traded despite not being tied to any country.
Web is left unfiltered — there's no reliable country-to-currency API there.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QpjMKWGoiT5aJBzhxvXkwp
tyiuandClaude Sonnet 5
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