The Internet of Things (IoT) is today separated by different vertically oriented platforms for integration of all the different devices. Developers who aim to access other platforms and access that data are forced to manually adapt their interfaces to the specific platform API and data models. This paper highlights the work of the BIG IoT project that aims at launching an IoT marketplace and ecosystem as part of the European Platform Initiative (IoT EPI). The project finished end of 2018, so I will be able to present the setup of and the final results of the integration of the use cases that have been implemented in Northern Germany, Italy and Barcelona. Please refer to www.big-iot.eu for further details.