As far as I know, most APIs from that time mainly supported USD because BTC trading started there first and has the longest price history. If you need historical BTC prices in other currencies, one option is to use a BTC/USD historical API and then convert the values using historical FOREX exchange rates from providers like OANDA or XE.
You can also check APIs from exchanges or data providers like CoinDesk, which offered BTC indexes in multiple currencies.











