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With the advent of the nanosat/cubesat revolution, new opportunities haveappeared to develop and launch small ($\sim$\ts 1000 cm$^3$), low-cost($\sim$\ts US\$ 1M) experiments in space in very short timeframes ($\sim$ 2\tsyears). In the field of high-energy astrophysics, in particular, it is aconsiderable challenge to design instruments with compelling science andcompetitive capabilities that can fit in very small satellite buses such as acubesat platform, and operate them with very limited resources. Here wedescribe a hard X-ray (30--200\ts keV) experiment, LECX ("Localizador deExplos\~oes C\'osmicas de Raios X" -- Locator of X-Ray Cosmic Explosions), thatis capable of detecting and localizing within a few degrees events likeGamma-Ray Bursts and other explosive phenomena in a 2U-cubesat platform, at arate of $\sim${\bf 5 events year$^{-1}$.} In the current gravitational wave eraof astronomy, a constellation or swarm of small spacecraft carrying instrumentssuch as LECX can be a very cost-effective way to search for electromagneticcounterparts of gravitational wave events produced by the coalescence ofcompact objects.

LECX: a cubesat experiment to detect and localize cosmic explosions in hard X rays