But that's what central banks are there for, to provide emergency liquidity to regulated banks in order to support the stability of the financial system. Also

But that's what central banks are there for, to provide emergency liquidity to regulated banks in order to support the stability of the financial system. Also do consider that most contracts include grace periods for technical glitches. But the first line of defense is the enormous amount of cash and liquid assets banks are required to hold to ensure they remain liquid.