What organization is often seen as the lender of last resort to nation-states whose economies are in turmoil and currencies are losing value against those of other nations?

International monetary fund (IMF)

Explanation:

The International Monetary Fund (IMF) is an organization made up of 189 countries that seek to promote global financial coordination, ensure financial security, encourage global trade, stimulate higher employment and stable economic development, and reduce global poverty.

The IMF organization is often seen as the lender of last resort to nation-states whose economies are in turmoil and currencies are losing value against those of other nations.

The IMF supervises the international monetary system and monitors its members' political and economic policies.