Coppers are the native currency used by amphibians all over Amphibia.
The standard unit of their currency system seems to be the minted "copper" coin, which is the most commonly mentioned. Other denominations are implied to exist but have rarely been mentioned: in "Plantar's Last Stand", Mrs. Croaker mentions that she's been saving a "gold farthing" coin, worth 20 coppers, for something special.
Appearance
Each coin has two distinct sides. One side depicts an unknown, unidentified amphibian person of interest, likely a lawmaker or ruler, and the other side simply shows the three-pronged frog foot symbol/logo of Amphibia.
Other payment methods
Depending on the technological advancement of a specific Amphibian area, some vendors/shops/stores may accept a primitive form of a credit card. This technology is primarily reserved for use in Newtopia, though.
One such example is the Royal Credit Card. It has unlimited funds on it and can purchase anything anywhere where credit cards are accepted in Amphibia. It is extremely rare and coveted as well, as the only person who has possession of it is the king of Amphibia himself, to which he alone can give to a party or person at his own discretion.
Trivia
- In "Wax Museum", Curator Ponds announces to Anne that the Skip Man CD player previously owned by Dr. Frakes from Earth costs a million coppers.
- However, given the Curator's personality with his questionable business, this cost could possibly be regarded as fabricated.
- The Royal Credit Card has an almost unlimited amount of money to spend, but not on cash-only products.
- The cost of each food on the menu in "Lost in Newtopia" also shows the Amphibian language on the menu.
- While not entirely true, it's possible coppers in coin form are made of the material with the same name similar to Earth's counterparts used by humans.