This is a free set of tools built upon the Google Base API, which will give users everything from a valuable insight into competitors listings and prices to stats, like pageviews, impressions and clicks, on their own items listed on Google Base.
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YES for eBay
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APIs, mashups and code. Because the world's your programmable oyster.
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.