Nonlinear Hall responses provide an electrical probe of Berry-curvature dipoles, but they are symmetry forbidden in many pristine two-dimensional metals. We show that layer-selective magnetic proximity provides a symmetry-controlled route to induce and tune anomalous and nonlinear Hall responses in metallic monolayer $1H\text{−}\mathrm{Nb}{X}_2$ ($X=\mathrm{S},\mathrm{Se},\mathrm{Te}$), where the nonmagnetic $D_{3h}$ crystal has vanishing anomalous Hall conductivity and a Berry-curvature dipole. Fully relativistic density-functional theory combined with Wannier interpolation shows that an out-of-plane proximity exchange preserving $C_3$ generates a sizable sheet anomalous Hall conductivity, ${\sigma }_{xy}^{\mathrm{sheet}}\sim {10}^{-2}(e^2/h)$ in representative active windows, while the Berry-curvature dipole remains zero. Breaking $C_3$ by introducing an in-plane exchange component, or by using an orthogonal two-sided exchange texture, produces a tunable Berry-curvature dipole and hence a nonlinear Hall response. Its exchange-odd part is linear in the in-plane exchange to leading order in the minimal model; the calculated spectra reach and can exceed $|D_y|\sim {10}^{-2}\AA$, with the largest and sharpest features in ${\mathrm{NbTe}}_2$. These trends are rationalized by symmetry analysis and an interface-induced $k$-linear Rashba-Zeeman minimal model. Within the idealized proximity model, an orthogonal dual-interface geometry further provides component-selective sign reversal of the first- and second-harmonic Hall signals in the same Hall-bar configuration.

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• Anomalous Hall effect
• Berry curvature
• Spin-orbit coupling
• Transition metal dichalcogenides
• First-principles calculations