commerce-8.x-2.8/modules/price/commerce_price.links.action.yml

entity.commerce_currency.import:
  route_name: entity.commerce_currency.import
  title: 'Add currency'
  appears_on:
    - entity.commerce_currency.collection

entity.commerce_currency.add_form:
  route_name: entity.commerce_currency.add_form
  title: 'Add custom currency'
  appears_on:
    - entity.commerce_currency.collection