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Building a calculator and matching items

Hi,
I am building a fee calculator and I want to do the following match up.

If the user selects a certain crypto, e.g. “BTC” in a dropdown field, the app should first check whether a) the item is available at a certain provider and if it is available, display the fees.
What is the smartest way to do that?

In my I could only think of a custom data type called “provider” with a field for each item that includes the fees for that provider. E.G. “BTC”:“0.75”. But I think I will then run into issues when doing a search from the dropdown field, correct?