CMC Converter API for CryptoPay WooCommerce Nulled is not a plugin by itself. It is an Add-on for the plugin linked below. Thanks to this plugin, you can use the data provided by CMC as the currency converter API. When you install the plugin, CMC option will appear on the Currency converter API list on the main plugin’s API’s page. As in the picture below.
Demo : https://codecanyon.net/item/cmc-converter-api-for-cryptopay-woocommerce/39635014