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In the last five years a large number of new high-temperature superconductorshave been predicted and experimentally discovered among hydrogen-rich crystals,at pressures which are way too high to meet any practical application. In thiswork, we report the computational prediction of a hydride superconductor,LaBH$_{8}$, with a T$_{c}$ of 126 K at a pressure of 50 GPa, thermodynamicallystable above 100 GPa, and dynamically stable down to 40 GPa, an unprecedentedlylow pressure for high-T$_{c}$ hydrides. LaBH$_{8}$ can be seen as a ternarysodalite-like hydride, in which a metallic hydrogen sublattice is stabilized bythe chemical pressure exerted by the guest elements. The combination of twoelements with different atomic sizes in LaBH$_{8}$ realizes a more efficientpacking of atoms than in binary sodalite hydrides. A suitable choice ofelements may be exploited to further reduce the stabilization pressure toambient conditions.

LaBH$_{8}$: the first high-T$_{c}$ low-pressure superhydride