Timothy

Problem
I would like to have currency based on client's address. If user has selected United States on checkout the currency will be set to USD.

Solution
That is not a standard feature of WPML or WCML.

You can restrict currencies by language and payment gateways by country using the "WooCommerce Gateways Country Limiter" add on.

But you can´t limit currencies based on users address.

For that you may need custom programming work which is beyond the scope of our support.

Documentation
https://wpml.org/download/woocommerce-gateways-country-limiter/