Considering the trade information reported here: https://btc-e.com/api/3/trades/btc_usd
Do these refer to open orders, or to completed trades? If this shows only completed trades, does the API offer a means to retrieve the open orders?
Each record has an 'amount' field. Is this field always in USD for both bids and asks?
Have a look at the documentation (unfortunately it's in russian, but google can translate): https://btc-e.com/api/3/documentation
I think it's finished trades. Look at the Depth method to get open orders https://btc-e.com/api/3/documentation#depth
If you are looking at the btc_usd pair, then the price is in USD, and the amount in BTC
