Finding an example of a currency converter historical

Hello everyone, I am new and starting to like MIT App Inventor.
To begin I am looking for a currency converter model with a firebase database. Let me explain : I would like to store the data, and starting with the DateID, then USD with its value and CAD and its value and .......
then in another screen at the opening, I choose the desired Date and display the value of USD or CAD.
I searched on the net but I couldn't find any examples.
Thank you.

Here is a sample web page shredder for current currency conversion based on xrates...

I have no idea if they keep historical data.

Google Sheets option:


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Thank you for your answers.