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retrieve the next page of results (pass next_cursor from the response payload)
retrieve only namespaces that match the prefix, e.g. foo would return foo and foo-bar.
limit the number of results per page (max of 1000)
Warning: This endpoint is currently not consistent. In other words, it's possible for short periods of time that a namespace exists but is not returned on this endpoint (or, that a namespace doesn't exist, but is returned from this endpoint).
