It looks like Amazon has an API for their fulfillment service: http://www.amazon.com/gp/seller/fba/fulfillment-by-amazon.html http://www.amazon.com/gp/seller/fb

It looks like Amazon has an API for their fulfillment service: http://www.amazon.com/gp/seller/fba/fulfillment-by-amazon.html http://www.amazon.com/gp/seller/fba/fulfillment-by-amazon.ht... and http://aws.amazon.com/fws/ http://aws.amazon.com/fws/ could work as the foundation for your application. Your API could sit on top of Amazon's the way Crowdflower sits on top of Amazon Mechanical Turk.