Crisis-hit Franco-Belgian bank Dexia is getting temporary financing guarantees from Belgium, France and Luxembourg.
That will enable it to keep running while the countries work out the details of a 90 billion euro bailout plan they put together in October.
There are said to be differences between the three states over who should pay what and reports of fresh talks last month hit both Belgian government bonds and the euro.
Dexia says the agreement will cover as much as 45 billion euros of its financing needs to the end of May.
Dexia will provide the three states with collateral for some of the guaranteed obligations issued, a fee of 225 million euros, and monthly fees based on the outstanding amount of guaranteed debt.
Dexia said the agreement was a draft and the terms might be reviewed. Its board would reach a decision once such terms were finalised.