WooCommerce Development

Hi, i need a cutom calculator integrated with woocommerce cart for my site. To get a better idea of what i need exactly, go to link: [login to view URL] I'm building a site that sells BITCOINS and ETHEREUMS, so i need a custom calculator that would pull the price of the Cryptocurencies from a API of [login to view URL] and to that price Add some extra fees to the final price. it should have two fields( "amount" and "price" ) and a "BUY" button (just like [login to view URL]) when users hit buy it should take the values from the calculator fields and take him to the CART with the values he calculated. Calculator should work with USD$(dollars) and with DOP$ (Dominican Pesos) the calculator should work a custom "Shop" page, and each cryptocurrency should work as a woocommerce product. So in conclusion i want what they do: [login to view URL] but in a woocommerce site, getting real time crytocurrencies prices from an API of BITBAY.Net. Please let me know how much would it cost if you can achieve it. and how much time do you need to achieve it. Also let us know if other existing plugins should be integrated for it to work. Thanks, looking forward to your answer.