  Among known materials, hydride superconductors have the highest critical
temperatures and are very promising as a basis for electronic sensors.
Superconducting quantum interference device (SQUID), due to its unique
sensitivity to magnetic fields, is the most important application of
superconductors in microelectronics. In this work, we describe a direct current
SQUID made of lanthanum-cerium superhydride (La, Ce)H$_{10}$ at a pressure of
148 GPa, with an operating temperature of 179 K and a bias current of about 2
mA. When placing (La, Ce)H$_{10}$ in a modulated magnetic field (0.1-0.005 Hz,
5 G), we observed the generation of higher harmonics up to 18${\nu}$$_0$ and a
periodic dependence of the sample resistance on the magnetic flux density R
${\propto}$ cos(${\pi}$${\Phi}$/${\Phi}$$_0$). We demonstrate that the (La,
Ce)H$_{10}$ SQUID with a size of about 6 ${\mu}$m, operates in the mode of low
thermal fluctuations and can be used to detect magnetic fields below 0.1 G. Our
findings pave the road to more advanced applications of the Josephson effect
and SQUIDs made of hydride superconductors.
