In particular, this included the US Fed supplying unlimited liquidity in US dollars to the ECB, the Bank of Japan, the Bank of England and the Swiss National Bank. Other swap lines have also been put in place, for example the ECB provides Euros to the Fed.
At the peak of the crisis in December 2008, the US Fed provided globally Euro 432 billion (USD 583 billion). Since then, demand has receded continuously and the swap lines have been discontinued. Lastly, monetary units or loan facilities created by supra-national monetary authorities can grant liquidity to their member states.