After successful tests in New York City, Chicago and San Francisco, on-demand delivery service UberRUSH has officially opened, and many are wondering if it will be the killer app that threatens InstaCart.This API is available to any online merchant operating in an UberRUSH city to add a same-day delivery option to their own online shopping platform.
Source: Fast Just Got Faster for Supermarkets with UberRUSH | ProgressiveGrocer