Here's a good tip to avoid currency conversion fees from when traveling abroad: Always pay in local currency and use a credit card that has no fees for international currency conversion. The article linked here points out that Uber will charge a 1.5% fee automatically, unless you change a setting in the app:
To opt out, open your Uber app and click "Account." From there, go to your "Wallet" and click on "Preferred Currency." It should default to your home currency — but you can change the setting to "No preferred currency" if you prefer to pay in the local currency when you travel. By making "No preferred currency" your default, you can avoid the 1.5% surcharge.
How to turn off this new Uber feature so you aren't overcharged - The Points Guy
Uber's "preferred currency pricing" could lead you to pay more for your next ride.