Automatic update of the currency rate + prices for the right products/categories opencart 2.1?

Question

opencart

Hello!
The essence of the problem:
There is a supplier whose prices are updated depending on the dollar.
If in opencart the RUB currency is auto-updated, then the prices will be raised for absolutely all goods.
It is necessary somehow, without creating an additional currency, to tie the category / products / manufacturers to the exchange rate.
Is there a module available? I searched, but did not find, except for Exchange rates + and so on. But there is no such functionality

Answer 1

It seems that I have seen some modules before, that you can set prices for different products in different currencies. And then they are converted at the exchange rate into the main currency of the store. But it is not exactly.
In the extreme case, it is not so difficult to write it. You need to add 1-2 fields in the product card and update prices by krone.
The only question is at what dollar rate you will convert, from where to pull it up and how often to recalculate prices.