  In this proceeding we consider primordial black holes (PBHs) as a dark matter
candidate. We discuss the existing limits on the fraction $f_{pbh}$ of the dark
matter constituting of PBHs as a function of PBHs mass. The discussed limits
cover almost all possible mass range with the currently only open window in
$3\cdot 10^{16}-10^{18}$ g in which the PBHs can make up to 100% of the dark
matter content of the universe. We present the estimates of the capabilities of
the near-future instruments (Einstein Probe/WXT, SVOM/MXT) and discuss the
potential of next-generation missions(Athena, THESEUS, eXTP) to probe this mass
range. We discuss the targets most suitable for the PBH dark matter searches
with these missions and the potential limiting factor of the systematics on the
derived results.
