A Currency Tool utility is made available in your Zope Application root,
and from this, you can configure it to subscribe to various tickers to
receive bid/ask/mid rates for whatever currencies you are interested in.
The tool stores and allows retrieval of these rates. There is also a
facility to show graphs of these currencies.
You can then assign portal_currency tools into your Plone site to manage
these quotes on a per-site basis.
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