What is a grey screen transaction in banking?

A gray screen transaction relates to the old style Nostro Banking prior to the very good SWIFT service, however the term has been highjacked by gray market financial brokers (non-licenced) and often used by fraudsters in a bank guarantee transaction or scam. The claim is that under a specific code bank or financial instruments can be assessed and downloaded against cash or a credit line, allowing very high amounts to be transacted for 10 to 20% of the face value with major banks. While such things exist, they are neither secret nor are they risk free as projected and the old saying : you get what you pay for! really applies. the details are not murky and infact a good internationally versed financial lawyer should be able to explain. These transactions are not for retail banking but institutional banking. When advertised through non licensed entities they are usually part of an laborate scam. Often combined with variations of "roll programs, bank guarantee or mtn programs or trading" in short all the advance fee scams the various agencies are warning about.

The existing variants are currently under scrunity for compliance and Basel III adjustments in bank handling.