Nearly every kingdom of the World of Teréth End has minted their own coinage. Often, coins are minted every time a new monarch is crowned or (less commonly) to commemorate significant events. Because there is so much variety in coins (e.g., shape, weight, size, composition) it is important for moneychangers and trading guilds to have a universal system to determine their value relative to every other coin in circulation. Determining the value of new coins versus old coins is a never-ending process.
Most economies use the “silver piece” as the standard unit for trade. In the realms of the Old Empire, the Audàrār (though no longer in general circulation) remains the standard for determining the value of other coins.