None. Seriously. No currency. No coinage. It's proving interesting to get my head around, but given I've based the culture on roughly 9th century BC Greece and coinage didn't come about until the 6th century BC (ish) my culture also has no coinage. But since I won't be going into too much detail regarding exchange rates between various commoditites I should be fine.
For those looking for a different form of currency, don't forget that electrum, a natural alloy of silver and gold, can be used for coinage, and indeed was in the ancient world. I like to imagine we can see the vestiges of it still in £2 and €1 coins, which have silver-coloured and gold-coloured metals with the latter forming a ring around the former, with the €2 coin inverted.
For those looking for a different form of currency, don't forget that electrum, a natural alloy of silver and gold, can be used for coinage, and indeed was in the ancient world. I like to imagine we can see the vestiges of it still in £2 and €1 coins, which have silver-coloured and gold-coloured metals with the latter forming a ring around the former, with the €2 coin inverted.