http://www.federalreserve.gov/ (USD)
European Central Bank: http://www.ecb.europa.eu/home/html/index.en.html (EURO)
Bank of England: http://www.bankofengland.co.uk/Pages/home.aspx (GBP)
Reserve Bank of Australia : http://www.rba.gov.au/ (AUD)
Reserver Bank of Newzeland : http://www.rbnz.govt.nz/ (NZD)
Bank of Canada: http://www.bankofcanada.ca/ (CAD)
Bank of Japan: https://www.boj.or.jp/en/statistics/boj/other/reserve/index.htm/
(JPY)
Bank of Switzerland : http://www.snb.ch/en/ (CHF)
_______________________________________________________
All the above Websites listed are official sites where you can check the information for monitory policy, financial stability, bank notes, press conference, press releases etc.,