“Currency rates” or “currencies rates”

Question

What is the correct form when we have a rate for each currency in a list of currencies. For example if currencies are EUR, GBP and USD there will be a rate (buy and sell) for each one of these currencies.

Answer 1

"Currency rates" is the preferred form. Personally, I would say that it is the only correct form, but Google does return about 15,000 hits for "currencies rates" (vs. 1,600,000 hits for "currency rates").

Edit: seeing that your question is tagged "British English", I searched the British National Corpus (BNC) and got the following results:

   4 - currency   rates
   1 - currency   rate
   0 - currencies rates
   0 - currencies rate  (actually, 1, but "rate" is being used as a verb)

Also, as Noldorin suggests in his answer, there is the more popular term "exchange rate", for which Google returns 12,400,000 hits and BNC offers the following stats:

1192 - exchange rates
 408 - exchange rate

And, for the sake of completeness:

  14 - foreign    exchange rates
   6 - foreign    exchange rate
   4 - currency   exchange rate 
   2 - currency   exchange rates
   0 - currencies exchange rate
   0 - currencies exchange rates

Answer 2

The usual term is exchange rate. If you want to be unambiguous, say foreign exchange rate.