Google API is not accurate
Google SOAP Search API (beta) has serious problems with accuracy. If you compare the results returned from the API to results from manually searching on Google, they are rarely the same. The is a serious problem.
It is against the Google terms of service to scrape the search engine results to obtain keyword positions for your web site. Unfortunately, this is the only accurate method of obtaining this information. Scraping search engine results takes up precious server bandwidth and resources that from Google’s perspective they want to be used for actual surfers searching for web pages and not for your web site analysis that earns them zero advertising revenue.
Bottom line is that SEO firms and many others use web page scraping as it is the only method of getting an accurate picture of whats happening on Google. Until Google fixes their API, expect this to continue.
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