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And, technically, aren't you accessing the Services through the interface provided by Google when you access their public API?

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Yes! Having said that, I'm not taking any chances - I don't expect to hear from them, but will attempt to get an answer from Google as to whether this is ok.

I'm rewriting the scraper right now to use a different service with a more friendly TOS pending further investigation - can't afford a legal battle over this!

You might find this article, "Considerations on Exchange Rate Data Providers", useful: http://www.currencysystem.com/kb/13-143

It's from the website of the Cloanto system and has some ideas on publicly available FX feeds.

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