domain.com/products.json return different currency values ?

[ProgramerAnel]

To get products from certain page I go with  

domain.com/products.json 

It works perfect but the problem here is that sometime the response contain prices in €,£,$ is it possible to always get prices in $ ?

There is no rule in which currency it will return me.

Hint: I'm always using same server located in USA but sometimes it just return me price in £

[ProgramerAnel]

Edit: When I use endpoint   domain.com/shop.json I have a node 

data-currency="GBP"

Is it possible to request as a visitor's to display me prices in USD ?