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We report the discovery of ZTF J0127+5258, a compact mass-transferring binarywith an orbital period of 13.7 minutes. The system contains a white dwarfaccretor, which likely originated as a post-common envelope carbon-oxygen (CO)white dwarf, and a warm donor ($T_{\rm eff,\,donor}= 16,400\pm1000\,\rm K$).The donor probably formed during a common envelope phase between the CO whitedwarf and an evolving giant which left behind a helium star or helium whitedwarf in a close orbit with the CO white dwarf. We measure gravitationalwave-driven orbital inspiral with $\sim 35\sigma$ significance, which yields ajoint constraint on the component masses and mass transfer rate. While theaccretion disk in the system is dominated by ionized helium emission, the donorexhibits a mixture of hydrogen and helium absorption lines. Phase-resolvedspectroscopy yields a donor radial-velocity semi-amplitude of $771\pm27\,\rmkm\, s^{-1}$, and high-speed photometry reveals that the system is eclipsing.We detect a {\it Chandra} X-ray counterpart with $L_{X}\sim 3\times10^{31}\,\rm erg\,s^{-1}$. Depending on the mass-transfer rate, the system willlikely evolve into either a stably mass-transferring helium CV, merge to becomean R Crb star, or explode as a Type Ia supernova in the next million years. Wepredict that the Laser Space Interferometer Antenna (LISA) will detect thesource with a signal-to-noise ratio of $24\pm6$ after 4 years of observations.The system is the first \emph{LISA}-loud mass-transferring binary with anintrinsically luminous donor, a class of sources that provide the opportunityto leverage the synergy between optical and infrared time domain surveys, X-rayfacilities, and gravitational-wave observatories to probe general relativity,accretion physics, and binary evolution.

Orbital decay in an accreting and eclipsing 13.7 minute orbital period binary with a luminous donor