First, I’d take a look at EcoSys documentation to check interfaces EcoSys allows for connection. Denodo supports generic JDBC connections which I’d recommend to use if EcoSys supports that.
Also, I’ve checked that EcoSys has a Web Service API. In Denodo you could make an HTTP request to connect into it. You can view how to send an HTTP request to a server in [the HTTP path section](https://community.denodo.com/docs/html/browse/8.0/en/vdp/administration/creating_data_sources_and_base_views/path_types_in_virtual_dataport/http_path) of the VDP Administration Guide and create a XML, Json or Delimited File data source depending on the format selected by the API.
Hope this helps!