  The origin of the ultra high energy cosmic rays (UHECRs, $E>10^{18}$ eV) is
still uncertain. However, great progress has been achieved due to the data
taken by The Pierre Auger and Telescope Array observatories. The UHECR flux
presents two main features, a hardening of the spectrum known as the ankle and
a suppression at higher energies. The experimental data suggest that above the
ankle the UHECRs flux is dominated by an extragalactic component of
astrophysical origin. However, a minority component of exotic origin that
dominates the flux beyond the suppression is still compatible with current
data. Therefore, there exist the possibility that part of the UHECR flux
originates from the decay of super-heavy dark matter particles clustered in the
halos of the galaxies. In these scenarios the main contribution comes from the
halo of our galaxy. In this article the possibility of identifying these
scenarios in the context of the future very large exposure cosmic rays
observatories is studied. It is worth mentioning that the contribution of the
extragalactic halos located in the nearby universe is also included in these
studies.

High Energy Astrophysical Phenomena