3:35 PM Eastern – At this time, we are seeing timeouts on some requests to the Contacts API. This also results in some parts of the HubSpot Dashboard to time out or to return errors.
HubSpot Engineering is aware of this issue, and is working to address it now.
[ UPDATE 3:51 PM Eastern ] At this time, Contacts API is responding to all requests as expected. We are working to process a backlog of actions, such as list segmentation, that require the Contacts API. We expect that backlog to clear shortly.