Our API cloud provider has confirmed the DNS resolution incident affecting many of their regional datacenters:
"We are currently experiencing a partial outage in our Chicago, Dallas, Frankfurt, London, Los Angeles, Seoul, Singapore, Sydney, Tokyo, Toronto location. Our network engineers are actively working with our upstream providers to restore connectivity as quickly as possible. This has been effecting DNS resolution and overall network connectivity at this time."
https://status.vultr.com/
We are awaiting their resolution. When back online our chat APIs should also be restored.