As of today, January 29, 2016, Google Maps Engine API is deprecated. This means that the product support and the API will no longer be available.
Google Maps Engine was mainly a platform which provided businesses cloud based services for editing and storing their geographic data built on Google basemap. Google basemap remained a standard for most users who wanted to visualize and process any kind of information associated to a location, but it wasn’t the same with Google Maps Engine as a cloud service. Many users who decided to work in cloud environment choose other services for manipulating the data often built on Google Maps base layer.
GIS Cloud provides an excellent alternative to Google Maps Engine. We have put together a post summing up the benefits GIS Cloud’s platform offers to those who are seeking alternatives to GME API.
More info here.