  We consider the focusing inhomogeneous mass critical half-wave equation in
one dimension. Under the mild conditions of the inhomogeneous factor, we show
that the existence of the radial blowup solutions with ground state mass
$\|u_0\|_2=\|Q\|_2$, where $Q$ is the unique positive ground state solution of
equation $DQ+Q=Q^3$ and obtain the blowup rate
$\|D^{\frac{1}{2}}u(t)\|_{L^2}\sim\frac{1}{|t|}$ as $t\nearrow 0^-$.
