Who administers direct democracy mechanisms at the national level?

Singapore Election Department

Elections Department Singapore website

ABOUT ELECTIONS DEPARTMENT

http://www.eld.gov.sg/about.html

The Elections Department of Singapore (ELD) is a department under the Prime Minister’s Office. It has the responsibility of planning and preparing for, and managing the conduct of Presidential and Parliamentary elections and of any national referendum in Singapore. The Department has under its purview the Registry of Political Donations (RPD). The RPD administers the Political Donations Act, the objective of which is to prevent foreign interference in the domestic politics of Singapore through funding.