Several structured p2p systems exist in literature and many applications have been developed on top of them. To use these applications on top of different overlays without changing their implementations, a common API was proposed in [7]. However, since that specification is meagre, current implementations of structured p2p systems have customized it reducing the portability of applications. In addition, in mobile environments, the possibility to exploit cross-layer interactions considerably improves overall performace. In fact, a crosslayer p2p system, called CrossROAD, has been recently designed to optimize structured overlays on MANETs. It directly interacts with a proactive routing protocol, and it can provide cross-layer information to upperlayer applications to further optimize their behavior. In this paper we propose a cross-layer extension of the commonAPI pointing out advantages of the cross-layer approach even at the application layer.