GRANDProto300 (GP300) is a prototype array of the GRAND experiment, designed to validate
the technique of autonomous radio-detection of astroparticles by detecting cosmic rays with
energies between $10^{17}$-$10^{18.5}$ eV. This observation will further enable the study of the Galactic-
to-extragalactic source transition region. Since November 2024, 46 out of 300 antennas have
been operational and collecting data stably. We present our cosmic-ray search pipeline, which
involves several filtering steps: (1) coincidence search for signals triggering multiple antennas
within a time window, (2) directional reconstruction of events, (3) exclusion of clustered (in time
and space) noise events, (4) polarization cut, (5) selection based on the size of the footprint, and
(6) other more arbitrary cuts in this preliminary stage, including visual cuts. The efficiency of the
pipeline is evaluated and applied to the first batch of data, yielding a set of cosmic-ray candidate
events, which we present.