The emergence of the Internet has opened a world of possibilities to connect and interact through web portals and to exchange information over the network. In the past decade, buying and selling of goods and services online has become more common through e-commerce. With the advent of Cryptocurrencies, the possibilities of e-commerce have reached new heights for all web users who see potential in this technology. Cryptocurrencies have opened new dimensions based on a Blockchain technology for e-commerce through decentralization; increased privacy and digitalization of coins allow users to anonymously trade online. This has become more common in the Darknet, which is simply the unindexed side of the Internet. This chapter compares the three Cryptocurrencies, namely bitcoin, ethereum and monero, used for e-commerce in the Darknet.