I don't know that there are any advantages of the 3.0 key versus the 2.5 key. The 2.5 key is no longer obtainable, so new users can only get a 3.0 key. In order to get a 3.0 key they must put in a payment method that will be charged should they exceed the 1,000 calls per day 'free' limit. As far as I have been able to determine the functionality is identical. A 2.5 key will only work on the 2.5 API endpoint. It will not work on the 3.0 API endpoint. A 3.0 key will only work on the 3.0 API endpoint. It will not work on the 2.5 API endpoint.
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