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The purpose of the data description document is to provide the information needed to understand and use the various data displayed on the site.
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for sale price
decimal
The for sale price is the price at which you put the item up for sale.
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lego price
decimal
Official LEGO® selling price.
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listed price
decimal
Displayed only if you have activated the parameter shops fees.
This is the price displayed on selling platforms that charge fees to buyers, such as Vinted or Leboncoin. As a buyer, you’ll have to pay this price plus the fees.

listed price=purchase price−feeslisted\,price = purchase\,price - fees

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margin price
decimal
The margin price is the price at which you must sell the item purchased at the purchase price to obtain a margin rate defined in settings.

margin price=purchase price∗(1+margin)margin\,price = purchase\,price * (1+margin)

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market price
decimal
Item value according to the average of similar items for sale on Bricklink®. When no copies are for sale on Bricklink®, Brickyfi uses ChatGPT to provide a price estimate.
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purchase price
decimal
Price at which you must buy the item in order to sell it at the selling price and obtain a margin defined in settings.

purchase price=selling pricemargin+1purchase\,price = \frac{selling\,price}{margin+1}

For items in your collections (except for wishes) this is the price at which you purchased the item.
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profit
decimal
The profit is the profit you will make by buying the item at the purchase price and selling it at the selling price.

profit=selling price−purchase priceprofit = selling\,price - purchase\,price

For the for sale items this is the profit you will make by selling at for sale price the item purchased at purchase price.

profit=for sale price−purchase priceprofit = for\,sale\,price - purchase\,price

For sold items this is the profit you made by selling at sold price the item purchased at purchase price.

profit=sold price−purchase priceprofit = sold\,price - purchase\,price

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selling price
decimal
Price at which you will have to sell the item (according to the discount rate defined in settings).

selling price=market price∗discountselling\,price = market\,price * discount

If you have activated the shops fees parameter:

selling price=market price∗discount−feesselling\,price = market\,price * discount - fees

For figurines it is equal to the Market price:

selling price=market priceselling\,price = market\,price

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sold on
list
Store where you sold the item.
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sold price
decimal
Price at which you sold the item.
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yield rate
decimal
The yield rate is the percentage margin for an item bought at purchase price and sold at selling price.

yield rate=profitpurchase price∗100yield\,rate = \frac{profit}{purchase\,price}*100

For sold items The yield rate is the margin percentage for an item bought at purchase price and sold at sold price.

yield rate=profitpurchase price∗100yield\,rate = \frac{profit}{purchase\,price}*100