Obol

The Standardized Plutonian Tender, or Obol, is the official legal tender of Pluto and its surrounding colonies. It is named after the fare paid to Charon, the ferryman of the underworld in Greco-Roman mythology. It is much stronger than the New Martian Credit, but it achieved this through self-imposed, strangulating economic sanctions by the Plutonian government that resulted in widespread abject poverty in the system.

Apparence
Though the currency itself is tracked electronically, credit chits are made of diamond, made flat and perfectly round to resemble a coin. Microscopic tracking numbers are etched into the diamond upon minifacture, for use with Terran scanners and to prevent counterfeiting. Inside the diamond is a wafer-thin molybdenum disc. On one side is the bust of the jackal, Pluto, the Roman god of the underworld, and on the other is an etching of Pluto the dwarf planetoid, with its "heart", Sputnik Planum, prominently shown. Plutonian chit scanners use magnetic signatures rather than optical ones, and the tracking number is readable in the molybdenum's magnetic field.