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Is there some API or plugin that allows for creation of sites on a multisite install? Jetpack doesn't seem to allow it, and the xml rpc doesn't seem to support multisite. Is there something I can use as a JSON API or some other sort of http call to do this?

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There is nothing in core for this functionality, no. The only ways to create a new site are the wp-signup.php, for open systems, and the network admin add-new-site screen, for closed ones. There may be plugins to do this sort of thing. – Otto Feb 7 '14 at 19:37
wpmu_create_blog() appears to be the function you can call from within a WordPress plugin. codex.wordpress.org/WPMU_Functions/wpmu_create_blog – Seamus Leahy Feb 8 '14 at 5:14

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