MOXE (MOnitoring X-ray Experiment) is the all-sky x-ray monitor on the Spectrum-X-Gamma astrophysical observatory. The six MOXE pinhole cameras will enable almost continous observation of more than 95% of the sky in the 2–25 keV energy band. The scientific objectives of MOXE are to detect transient x-ray sources for follow-up by instruments on SXG or by other observers, as well as to study the time variability of x-ray sources. With a sensitivity of ≈ 3 mCrab (5σ) most of the observed persistent sources will be Galactic x-ray binaries. MOXE will be well suited as a partner in multi-wavelength campaigns.