The common currency across Blimnor has been "pieces", coins made of different precious metals including copper, silver, gold, and platinum. Each material with 10 copper pieces being equivalent to 1 silver piece, 10 silver pieces being equivalent to 1 gold piece, and 10 gold pieces being equivalent to 1 platinum piece.
Pieces are often stamped with patterns indicating in which country they were minted, however as long as a coin is made of the correct metal and is the correct weight, it is accepted as currency across the world.
However, some transactions or valuations only use pieces as an abstract measurement of value while the actual exchange is in tangible goods.
The common currency of Faeland are small round colored gems alternatively called "tears". They do not have a fixed value or denominations, with few transactions involving more than can be held in one's hand. Additionally, haggling is a customary ritual in Faeland, serving both to avoid the cultural taboo of fixed-prices, while also keeping exchanges simple and convenient.
A regretful property of tears is that, when brought into Blimnor, they will often transform into worthless objects such as pebbles, leaves, seeds, or even small insects. Consequently, Blimnorians are very wary of any sort of financial transactions with fey. Some enterprising folk have attempted to establish currency exchange banks in Faeland so that they may convert tears into pieces. However these companies are frequently disreputable.
Interplanar trade agreements instead use informal spoken contracts involving intangible goods such as secrets, names, dares, memories, voices, unborn children, or other such hypotheticals.