The Trucial rial is the currency of the Trucial States. The rial is valued at $3.88 US, or 0.2577 rials per dollar. Coins are issued in the amounts of 1/2, 1, 5, 10, 20 and 50 fils, and banknotes in the amounts of 1, 5, 10, 20 and the uncommon 50 rials.
The rial is the most valuable currency in the world, though it is not always the most stable. In previous years it has swapped positions with Kuwait for said distinction.