Radio and X-ray luminosities of radio-quiet (RQ) active galactic nuclei (AGN) are correlated, suggesting a common physical origin. Is the radio emission due to a magnetically active accretion disk corona, or a down-scaled version of a radio-loud relativistic jet? Variability time scales could provide a useful tool to estimate the size of the emitting region. RQ AGN vary dramatically in the X-rays, but much less, and on longer time scales, at the radio frequencies, i.e. at 5 GHz. Observing at sufficiently high radio frequencies should reveal much smaller regions of the AGN, comparable in size to those of the X-ray source, that are inaccessibly opaque at low radio frequencies, due to synchrotron self absorption. We report new observations of eight RQ AGN at 95 GHz. All observed targets are detected and broadband SEDs are derived. The results reveal the first radio insight into the inner parts of the radio-emitting structure, possibly indicating the signature of an accretion disk corona.