This document outlines Antwerp City Platform-as-a-Service (ACPaaS) and its Living Lab 'City of Everything' initiative to connect citizens and smart devices. It seeks startups to help build solutions through a buying process involving preparation, announcements, candidacy, pitching, requests for quotation, offers, and contracting. The goal is to stimulate the local economy through co-creation and leverage startups' innovative ideas, flexibility, and customer focus to help tackle challenges. Both startups and the city stand to benefit - startups gain customers, references, and funding while proving concepts, and the city accesses new solutions and is infused with entrepreneurial approaches.