The OpenTelematics API integrates all essential data required for the exchange of logistics information. In addition to vehicle, position and status information, messages, order and tour data, as well as information from the digital tachograph can be exchanged in a standardized manner. The solution is based on a REST-API according to "Open API Specification" and includes modern standards like "Webhooks" for event-based data transfer or the possibility of authorization by "OAuth2". We pay special attention to an unambiguous specification that follows common conventions and to comprehensive documentation. This ensures that the various implementations of the standard are compatible. The joint implementation of the OpenTelematics API significantly reduces the effort required to set up a new interface and thus allows us to focus on improvements to software products and services.