Modelled broadband non-thermal SED of Apep. We show SEDs for the two extreme combinations of parameters that are compatible with the hard X-ray emission component detected with NuSTAR (this work) and with the ATCA radio data (Callingham et al. 2019). Dashed lines show the synchrotron component, dot-dashed lines show the IC component, dotted lines show the p-p component, and solid lines show the total SED. We also show the Fermi-LAT upper limits from Martí-Devesa et al. (2023) and the sensitivity curve for CTA (Funk et al. 2013).