It's my understanding that AS treats all auctions as being in US dollars and cents. It will not convert bids into euros, English pounds, or what have you.
Steve's answer is a bit misleading. AS will not bid 30 dollars but just '30' instead. Ebay then receives a bid of 30 for whatever currency the auction is listed in. When placing snipes on AS, you just enter an amount - it is not specified as being dollars.
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