IV Macro Policy & Sovereign Debt
Central bank liquidity line
A standing arrangement under which a central bank temporarily supplies its own currency to a foreign central bank in a crisis, through a swap or a repo.
How it works
Liquidity lines come in two forms. In a swap line, two central banks exchange currencies at a pre-agreed rate and reverse the trade at maturity; the ECB provides euro and takes the foreign currency as collateral. In a repo line, the borrowing central bank pledges high-quality securities instead. According to the ECB's table of September 2025, its swap lines with the Fed and the central banks of England, Japan, Switzerland and Canada are standing and unlimited; the People's Bank of China line carries a 45 billion euro cap and runs to 8 October 2028.
Under EUREP, the ECB's repo facility, the cap is 50 billion euro per central bank and maturities run from overnight to one week, with extensions possible. The price is the main refinancing rate plus a spread set by the Governing Council, which keeps the facility a backstop. Eligible collateral is securities of EEA governments and recognised agencies rated at least credit quality step 3. Paper issued by the borrower's own government is excluded. Access can be refused on grounds of money laundering, terrorist financing or international sanctions.
The aim is to cut off contagion. A central bank without a line, facing a domestic euro squeeze, may be forced to sell the euro bonds in its reserves, and those sales push down euro area bond prices. The measurement trap is to confuse the existence of a line with its use: an unlimited swap line often sits at a zero balance and is drawn only under stress. Usage is tracked in the ECB's separate operations data.
Why it matters here
A liquidity line extends a currency's reserve role through access rather than price. Whoever gets a line can reach dollars or euro in a crisis; whoever is left out must lean on foreign exchange reserves. When the ECB's chief economist said in Shanghai on 21 October 2026 that more than 30 central banks had shown interest in EUREP, it signalled that the euro is building a rival to the dollar's crisis lending network. For countries outside the ECB's unlimited swap network, Türkiye among them, the first buffer against currency pressure remains net reserves excluding swaps.