A currency conversation formula for example:
=GOOGLEFINANCE("CURRENCY:"&C$2, "price", A3,)
Will display the closing price by default under "price". There is no option for the Average price. Hence going on to https://www1.oanda.com/currency/converter/ will return a different currency conversion than Google Sheets.
Is there a way to get Oanda's average price rather than using the closing price?