Swap lines were designed to improve liquidity conditions in U.S. and foreign financial markets by giving foreign central banks the ability to provide U.S. dollar financing to institutions in their legal services during times of market stress.  Swap lines are agreements between central banks to exchange the currencies of their country. $4 billion.  Swap lines are agreements between two central banks to keep reciprocal exchange countries available to their member banks. These agreements stabilize markets when they are stressed. They assure the banks that there will be no rush to a given currency that they will not be able to fill. Swap lines keep a lot of currencies available in times of stress. During the CSF, China set up lines of exchange with six countries, which were also assumed to have supported the Central Bank of China`s policy objective of promoting non-dollar currencies as a currency of exchange and investment. (BIS, page 33).
The (bilateral) agreement between Japan and Thailand allows both countries to exchange their local currencies (the Japanese yen and thai baht respectively) for each other`s US dollars. Thailand can also exchange the baht for the Japanese yen. Liquidity arrangements between central banks ensure access to foreign liquidity through two basic types of operations: currency swaps and deposits. The (bilateral) agreement between Japan and Singapore, which allowed each country to exchange its local currency for the other`s US dollar, was amended in 2018 to also allow Singapore access to the Japanese yen. The Scandinavian economies have made small euro swap lines available to the surrounding emerging countries to support the financial stability of these countries. . . .