This document proposes an app called the 21st Century Economy App for Cross-Species CoLiving. The app aims to redefine humanity's relationship with the natural environment by establishing a transactional system that provides mutual benefit and value exchange between humans and other species/environmental factors. It would use blockchain technology and complimentary currencies to give agency to non-human entities. The app was developed using HTML, JavaScript, C# and other technologies to be cross-compatible. It seeks to shift economic models towards being more reflective of humanity's dependence on healthy ecosystems and transition towards a post-anthropocentric approach that is multi-centered and recognizes the agency of all species.