MediaWiki:Apihelp-query+userinfo-paramvalue-prop-cancreateaccount
Indicates whether the user is allowed to create accounts. To check whether some specific account can be created, use action=query&list=users&usprop=cancreate.
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Indicates whether the user is allowed to create accounts. To check whether some specific account can be created, use action=query&list=users&usprop=cancreate.