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<a href="http://ripplesadvisory.com/services.php">Currency Service</a>

We also have this issue. Our app sends foreign currency invoices to multi currency Xero organisations but we use a different exchange rate provider for our currency feed. This means that our users have to manually override the Xero exchange rate on every invoice in order to get things to balance correctly.

This one may be much more useful, as I doubt someone is using different rates for invoices sent on the same day:
http://xero.uservoice.com/forums/5528-xero-api/suggestions/2051871-api-to-set-exchange-rates

I mean, it would be enough to just set the exchange rate to be used for a specific date. In our case, we would simply have a script running every date to set the proper rate for that day.

We issue invoices in a foreign currency, then when the invoice is paid we apply a payment in AUD using the exchange rate at the time of the payment. We don't care about foreign currency gains/losses so we want to be able to update the currency rate for the invoice to match the rate for the payment so that everything balances out.

Not having access to the invoice currency rate through the API is a massive pain for us.

This would be extremely helpful. We're currently using European Central Bank rates on our website, rather than (say) XE.com.

This would be very helpful for us. Given XE's currency exchange api licensing, we won't be able to properly specify the conversion from USD to our company's currency of NZD. We will also use our own exchange rates to convert values from USD to EUR, AUS, and GBP when we charge our customer's credit card.