A little something for your entertainment. I'll be using it in my campaign setting too. You'll note that the names are British. Probably has something to do with the fact I was watching a number of BBC programs on The Science Channel at the time. (A special arrangement between The BBC and Discovery Networks.) In any case, here is my currency and the coins that make it up.
The Coins of Ki
The nations of Ki (those that have currency, that is) use coins made of three metals. These are copper (cu), silver (ag), and gold (au). The ratio between the three is: 20 copper to one silver, 50 silver to one gold. Each metal comes in a one ounce or smaller coin. For copper the one ounce coin is the Five Pence, for silver it is the Shilling , and for gold it is the Crown. A full list of the coins, their metal, and weight now follows.
Farthing: cu, 1/40 oz. Four to the Ha'penny. U.S. equivalent: Penny
Ha'penny: cu, 1/10 oz. Two to the Penny. U.S. equivalent: Nickel
Penny: cu, 1/5 oz. Five to the Five Pence. U.S. equivalent: Dime
Five Penny: cu, 1 oz. Two to the Ten Penny. U.S. equivalent; Half Dollar
Ten Penny: ag, 1/10 oz. Five to the Fifty penny. U.S. equivalent: Dollar
Twenty-Five Penny: ag, 1/4 oz. Two to the Fifty Penny. U.S. equivalent: None
Fifty Penny: ag, 1/2 oz. Two to the Shilling. U.S. equivalent: Five Dollar bill.
Shilling: ag, 1 oz. Five to the Five Shilling coin. U.S. equivalent: Ten Dollar bill.
Five Shilling: au, 1/10 oz. Two to the Ten Shilling coin. U.S. equivalent: Fifty Dollar bill.
Ten Shilling: au, 1/5 oz. Five to the Crown. U.S. equivalent: One Hundred Dollar bill.
Pound: au, 2/5 oz. Two and a half to the Crown. U.S Equivalent: None.
Crown: au, 1 oz. None larger in value. U.S. equivalent: None.
The traditional D&D gold piece is equal to the Ten Penny coin in this system. Adjust all prices accordingly. If you like being nice, do the same with treasure walues. If you'd rather be cruel, convert the gold piece value to Pennies.
Letters of Credit: Because metal coins can get heavy in bulk, some nations and financial institutions issue what are known as, "Letters of Credit." In most cases these letters are honored at face value, but not every issuer has a good reputation.
In this matter the worst is Country X (I'll come up with a real name later) who's letters of Credit are honored at 5% of their face value outside of Country X. It also costs a fee of 50% of the coin being converted to convert it to a Letter of Credit, with conversion being mandatory for any amount equal to a Shilling on up. Converting a Country X Letter of Credit back into real currency in Country X is illegal. Naturally, there is a thriving black market in Country X Letters of Credit.
Some countries have gone so far as to formally adopt the idea of the Letter of Credit as official currency. There anything larger than the Shilling is issued as a bill. Most often varying in size and with different colored designs. Famous people, famous landmarks, scenes from popular stories, religious themes, etc. This allows those countries to issue bills for values as large as 10,000 crowns. In either case, Letter of Credit or paper money, the item can be converted to the equivalent in precious metal at any time. But when you consider the storage and security problem of, say 10,000 ounces of gold versus a single piece of paper weighing about 3 ounces (the 10,000 crown bill is large, but not large enough for a sprite to use as a blanket despite any fables you may have heard), the fact most people prefer paper currency becomes understandable.
So there you have the Ki money system. Feel free to adopt to your game if you wish.
The Coins of Ki
The nations of Ki (those that have currency, that is) use coins made of three metals. These are copper (cu), silver (ag), and gold (au). The ratio between the three is: 20 copper to one silver, 50 silver to one gold. Each metal comes in a one ounce or smaller coin. For copper the one ounce coin is the Five Pence, for silver it is the Shilling , and for gold it is the Crown. A full list of the coins, their metal, and weight now follows.
Farthing: cu, 1/40 oz. Four to the Ha'penny. U.S. equivalent: Penny
Ha'penny: cu, 1/10 oz. Two to the Penny. U.S. equivalent: Nickel
Penny: cu, 1/5 oz. Five to the Five Pence. U.S. equivalent: Dime
Five Penny: cu, 1 oz. Two to the Ten Penny. U.S. equivalent; Half Dollar
Ten Penny: ag, 1/10 oz. Five to the Fifty penny. U.S. equivalent: Dollar
Twenty-Five Penny: ag, 1/4 oz. Two to the Fifty Penny. U.S. equivalent: None
Fifty Penny: ag, 1/2 oz. Two to the Shilling. U.S. equivalent: Five Dollar bill.
Shilling: ag, 1 oz. Five to the Five Shilling coin. U.S. equivalent: Ten Dollar bill.
Five Shilling: au, 1/10 oz. Two to the Ten Shilling coin. U.S. equivalent: Fifty Dollar bill.
Ten Shilling: au, 1/5 oz. Five to the Crown. U.S. equivalent: One Hundred Dollar bill.
Pound: au, 2/5 oz. Two and a half to the Crown. U.S Equivalent: None.
Crown: au, 1 oz. None larger in value. U.S. equivalent: None.
The traditional D&D gold piece is equal to the Ten Penny coin in this system. Adjust all prices accordingly. If you like being nice, do the same with treasure walues. If you'd rather be cruel, convert the gold piece value to Pennies.
Letters of Credit: Because metal coins can get heavy in bulk, some nations and financial institutions issue what are known as, "Letters of Credit." In most cases these letters are honored at face value, but not every issuer has a good reputation.
In this matter the worst is Country X (I'll come up with a real name later) who's letters of Credit are honored at 5% of their face value outside of Country X. It also costs a fee of 50% of the coin being converted to convert it to a Letter of Credit, with conversion being mandatory for any amount equal to a Shilling on up. Converting a Country X Letter of Credit back into real currency in Country X is illegal. Naturally, there is a thriving black market in Country X Letters of Credit.
Some countries have gone so far as to formally adopt the idea of the Letter of Credit as official currency. There anything larger than the Shilling is issued as a bill. Most often varying in size and with different colored designs. Famous people, famous landmarks, scenes from popular stories, religious themes, etc. This allows those countries to issue bills for values as large as 10,000 crowns. In either case, Letter of Credit or paper money, the item can be converted to the equivalent in precious metal at any time. But when you consider the storage and security problem of, say 10,000 ounces of gold versus a single piece of paper weighing about 3 ounces (the 10,000 crown bill is large, but not large enough for a sprite to use as a blanket despite any fables you may have heard), the fact most people prefer paper currency becomes understandable.
So there you have the Ki money system. Feel free to adopt to your game if you wish.