A few links that might be useful: Shopify add-on, using the same engine (with a different face): http://apps.shopify.com/directed-edge-expressrex http://apps.

A few links that might be useful: Shopify add-on, using the same engine (with a different face): http://apps.shopify.com/directed-edge-expressrex http://apps.shopify.com/directed-edge-expressrex Write-up by one of our customers: http://www.jonathanbriggs.com/ecommerce/33-of-revenue-expressrex-recommendation-engine-recommended,814,AR.html http://www.jonathanbriggs.com/ecommerce/33-of-revenue-expres... Quora answer by an API user (at that time had already integrated, wasn't live yet): http://www.quora.com/How-good-is-Directed-Edge http://www.quora.com/How-good-is-Directed-Edge