There are two transaction flags that can affect your tax calculations, "missing cost basis" and "missing price". It's important that before you generate any tax forms that you resolve these flagged transactions to the best of your ability. This article will help you resolve your "missing price" flags.
To view your transactions with that flag, you go to the My Transactions page and use the "Any Flag" dropdown filter to show only your transactions flagged as "missing price". To explore the other filtering features available in the My Transactions page, check out our article on the subject HERE.
What causes missing price?
Generally speaking, when our pricing providers don't have historical pricing data for an asset on one side of a transaction at the time the transaction occurred, that transaction will be flagged with "missing price". This price is required to assign cost basis to that transaction, as it's important to know the average market value of that transaction. This value establishes the total proceeds portion of the cost basis calculations. You can read through THIS article for more information on where that pricing data comes from.
This pricing data does not come from the exchange the transaction occurred on, and there's currently no way to assign a market value to that transaction besides the method shown later in this article.
NOTE: Any missing price transactions from BlockFi can be ignored, that flag shows as a result of the special integration with them on transfer in/ transfer out transactions.
Adding market value data
As an example, let's say that I want to resolve the missing price flag on my UNI > USDT trade that occurred on 04/27/2021. I would select the transaction, and edit the "market value" field in the transaction details menu. For more information on how to edit a transaction, you can use THIS guide.
Now I'll need to determine the price of 1 UNI at the time the transaction occurred, and multiply that value by 255.856 (the amount of UNI involved in the transaction). Using Coin Market Cap (our first choice when finding market pricing data), I was able to get a value of 39.53 USD per 1 UNI. Doing the math, I find that the market value of this transaction should be 39.53 * 255.856 == 10113.99 USD.
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