The BUC

To make conversion between different coinages easier, each coin is assigned a BUC (Basic Unit of Currency) value. This value exists only as a means for players and Dungeon Masters to convert coinage… no moneylender in Duria actually uses this terminology when converting coinage.

Generally, 1 BUC = 1 silver coin, except in regions where the standard silver coin is heavily debased.

When converting from the prices in the Pathfinder rules, 1 BUC = 1 gp. Gold is relatively rare in Feyworld, so most places are on a silver standard (essentially, all prices given in the Pathfinder rules are actually 1/10 of their given value in Feyworld).