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The combination of compact objects, short period variability and peculiarchemical composition of the Ultra Compact X-ray Binaries make up a veryinteresting laboratory to study accretion processes and thermonuclear burningon the neutron star surface. The improved large optical telescopes and moresensitive X-ray satellites have increased the number of known Ultra CompactX-ray Binaries allowing their study with unprecedented detail. We analyze theaverage properties common to all ultra compact Bursters observed by INTEGRALfrom ~0.2keV to ~150keV. We have performed a systematic analysis of theINTEGRAL public data and Key-Program proprietary observations of a sample ofthe Ultra Compact X-ray Binaries. In order to study their average properties ina very broad energy band, we combined INTEGRAL with BeppoSAX and SWIFT datawhenever possible. For sources not showing any significant flux variationsalong the INTEGRAL monitoring, we build the average spectrum by combining allavailable data; in the case of variable fluxes, we use simultaneous INTEGRALand SWIFT observations when available. Otherwise we compared IBIS and PDS datato check the variability and combine BeppoSAX with INTEGRAL/IBIS data. Allspectra are well represented by a two component model consisting of adisk-blackbody and Comptonised emission. The majority of these compact sourcesspend most of the time in a canonical low/hard state, with dominatingComptonised component and accretion rate lower than ~10^{-9}Msolar/yr, notdepending on the used model to fit the data.

The INTEGRAL long monitoring of persistent Ultra Compact X-ray Bursters