Currency

While not necessarily "canon", the document at Dragon's Inn seems to name the currency units in the kingdom: Royal Currency of the Kingdom of Claremont.

In short, the following coins have been mentioned, with "20th century western prices" Dragon's Inn:

(Copper) Penny
Used mostly in the figurative sense, e.g. "pinch every penny"

Silver Sparrow
Wager that Charles Norwit makes; About $50. Brianna Barter gave the maid at Sunny Hallow Inn 3 silver coins when she overslept, partly as a tip, and partly to provide a packed lunch for her travel.

Silver Eagle
About $250: six simple pine coffins and temporary body storage cost three eagles. Brianna gave Cooyman a couple of silver eagles to pay for entertainment (mostly beer) for about twenty men of the Medusa Club.

Gold Domain
Partial (alloy) gold, also known as "gold piece"; about $500. Darl Norwit offered 10 gold pieces as a reward for finding his run-away "daughter".

Gold Imperial
About $1000: a prime-quality corpse is worth an Imperial to a Necromancer.

Gold Dragon
About $5000: six Gold Domains and two Imperials are Dragon's worth.

Gold Crown
About $20000.