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We study the dipole signal in the spectral index (x) of the differentialnumber counts using quasars in the CatWISE2020 catalog of infrared sources. Theindex is extracted by using the log-likelihood method. We obtain the value$x=1.579 \pm 0.001$ for a quasar sample of 1355352 sources. We extract thedipole signal in this parameter by employing $\chi^{2}$ minimization, assuminga sky model of x up to the quadrupole term. We find that the dipole amplitude|D| is 0.005 \pm 0.002 and dipole direction (l, b) in Galactic coordinatesystem equal to $(201.50^{\circ} \pm 27.87^{\circ}, -29.37^{\circ} \pm19.86^{\circ})$. The direction of dipole anisotropy is found to be very closeto the hemispherical power asymmetry $(l,b)=(221^\circ,-27^{\circ})$ in theCosmic Microwave Background (CMB). We also obtain a signal of quadrupoleanisotropy which is correlated with the ecliptic poles and can be attributed toecliptic bias.}

Probing Cosmological Principle using the spectral index of quasar flux distribution