Dynamic Converter is available in three packages Free Pro for those who want to get started and test the service, the free package allows you up to 10,000 requests/month. The Gold and Enterprise edition are more business oriented with the possibility to have Tax calculations, Automatic currency detection, Local JS file, and Currency pop-up branding. Pricing goes from $13 per month for Gold to $39 for Enterprise.
I liked the way to integrate Dynamic Converter in your e-Commerce website, after login to the website the console allow you to configure easily your settings: Your sites domains, Currency options, Currency format, Dropdown format, Currency selection box, and Filesize optimization.
Best of all, you can play with the look and feel of Dynamic Converter in your website and use it as could best fit with your interface design. This is important for e-commerce website to keep the interface convivial and easy to use for their customers. Users for example can simply click on the current price to show the currency converter menu and choose their currency, or you can use icons, links, dropdown menu … etc, and you can even use it inside dropdown menus like the case of the computer hardware configurator.
You can get started with the free Pro edition, then you can switch later to the package that fits better with your store.
For more information : Dynamic Converter