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Hidden monopole is a plausible dark matter candidate due to its stability,but its direct experimental search is extremely difficult due to feebleinteractions with the standard model particles in the minimal form. Then, weintroduce an axion, $a$, connecting the hidden monopole and the standard modelparticles and examine the current limits and future prospects of direct darkmatter searches and beam-dump experiments. We find two parameter regions around$m_a = {\cal O}(10)$ MeV, $f_a = {\cal O}(10^{5})$ GeV and $m_a = {\calO}(100)$ MeV, $f_a = {\cal O}(10^{4})$ GeV where monopole dark matter and theaxion are respectively within the reach of the future experiments such asPICO-500 and SHiP. We also note that the hidden photons mainly produced by theaxion decay contribute to dark radiation with $\Delta N_{\rm eff} \simeq 0.6$which can relax the $H_0$ tension.

Hidden Monopole Dark Matter via Axion Portal and its Implications for Direct Detection Searches, Beam-Dump Experiments, and the $H_0$ Tension