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We propose here the first joint study of the mm-X-ray variability of a radio-quiet AGN comma using XMM-Newton and ALMA to monitor the brightest unobscured AGN in the southern sky comma IC 4329A comma observing it once per day over ten consecutive days. The ALMA monitoring has already been approved openParpriority A comma highest resolutionclosePar. This would be the first time such a monitoring is carried out comma and the detection of correlated mm-X-ray variability would be a crucial proof of the coronal origin of the nuclear radio emission in radio-quiet AGN. Besides comma this would also be fundamental to understand the origin of the X-ray emission comma proving comma for the first time comma that the X-ray corona is magnetically-heated.