The Republic's own currency is called "Mondo" (singular) and "Mondoi" (plural). The price of one Mondo is tied to the price of one International Postal Reply Coupon rather than to currency market fluctuations. This provides for a very stable currency, it is possible for anyone to discover the prevailing exchange rate (which rarely changes) merely by walking into a post office and enquiring.

Rear: This coupon is exchangable in any country of  the Universal Postal Union for one or more postage stamps representing the minimum postage for a priority item.