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http://www.shadowbid.com
ShadowBid
ShadowBid monitors fluctuating prices on Amazon. Users can see price histories and set bids to purchase products after they fall below a certain price within a certain time.
I wrote the backend API to manage all data, securely handle payment information, monitor prices, and execute bids. I also worked on the accompanying Chrome extension, which is available on the Chrome extension store, and have made minor revisions and bug fixes to the mobile app.
http://www.shadowbid.com