Determining Cost of API Calls

Posted by Sam on Programmers See other posts from Programmers or by Sam
Published on 2011-01-12T18:22:18Z Indexed on 2011/01/12 18:58 UTC
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cost

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[This is a cross-post originally posted by me in SO. I think the question is more appropriate here.]

I was going through the adwords API and came across their rate sheet - http://code.google.com/apis/adwords/docs/ratesheet.html .

They charge $0.25 per 1000 API units and under the 'Operation Costs' sections list the cost (in API units) of different API calls. I am curious - based on what factors do they (and others API developers) calculate the cost of an API call? Is there any simple formula or a standard way to determine this?

Note: When I say 'cost' of an API call, I don't mean the money but the API units. For example, how do you determine one API call costs 100 'units' and another 1000?

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