There does not seem to be a "current" currency converter available for 2.7.1
Be a good idea (I think) if one was available which automatically converted any currency on a page to a given shortlist of currencies.
Example, if on a page you give a price £10.00 alongside would automatically give price in USD and/or Yen etc.
And/or geo code so if user of website is ion US then USD price shows.