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I'm using the Blockchain exchange rate API to add a Bitcoin exchange rate calculating function to one of my apps. I'm not sure which value I should be using. For each currency type (USD, EUR, etc.) four different rates are returned: "last," "buy," "sell," and "24h."

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Most people are interested in the last value or the 24 hour average, it depends on the purpose of the application and the intent of the developer.

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