Q. Is there a limitation set by Donuts on domain availability check command?
A. We do not limit the check commands per minute that a registrar may submit.
Submitting multiple commands exceeding the capacity per minute of our EPP server will not result in any failed connections. At most, it would result in a slower response. If you are expecting to have a high volume of requests per minute, please increase the timeout of your EPP Client to prevent your EPP client from terminating the connection on your end.