D&D 5E Player wealth

[was]

In my campaigns, there is a central trade guild that has branches in most of the major cities. Adventurers can purchase a safety deposit box in the trade guild's vault in a specific city. They can also convert their wealth into trade bars of various metals minted by the guild. Finally, they can exchange their wealth for an official letter of credit honored by any trade guild bank.

 

[Queer Venger]

This brings to mind the Iron Bank of Westeros. I'm thinking of adapting this for the Realms and using the Iron Throne as a banking power