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We report a study of the superconducting pairing of the noncentrosymmetricLa$_{4}$Be$_{33}$Pt$_{16}$ alloy using muon-spin rotation and relaxation({\textmu}SR) technique. Below $T_c = 2.4$ K, La$_{4}$Be$_{33}$Pt$_{16}$exhibits bulk superconductivity (SC), here characterized by heat-capacity andmagnetic-susceptibility measurements. The temperature dependence of thesuperfluid density $\rho_\mathrm{sc}(T)$, extracted from the transverse-field{\textmu}SR measurements, reveals a nodeless SC in La$_{4}$Be$_{33}$Pt$_{16}$.The best fit of $\rho_\mathrm{sc}(T)$ using an $s$-wave model yields a magneticpenetration depth $\lambda_0 = 542$ nm and a superconducting gap $\Delta_0 =0.37$ meV at zero Kelvin. The single-gapped superconducting state is furtherevidenced by the temperature-dependent electronic specific heat$C_\mathrm{e}(T)/T$ and the linear field-dependent electronic specific-heatcoefficient $\gamma_\mathrm{H}(H)$. The zero-field {\textmu}SR spectracollected in the normal- and superconducting states ofLa$_{4}$Be$_{33}$Pt$_{16}$ are almost identical, confirming the absence of anadditional field-related relaxation and, thus, of spontaneous magnetic fieldsbelow $T_c$. The nodeless SC combined with a preserved time-reversal symmetryin the superconducting state prove that the spin-singlet pairing is dominant inLa$_{4}$Be$_{33}$Pt$_{16}$. This material represents yet another example of acomplex system showing only a conventional behavior, in spite of anoncentrosymmetric structure and a sizeable spin-orbit coupling.

Probing the superconducting pairing of the La$_{4}$Be$_{33}$Pt$_{16}$ alloy via muon-spin spectroscopy