Cryptonomics: How to Earn Passive Income with Altcoins. Metropolis Decentralized Exchange offers many opportunities such as airdrops, staking, affiliate marketing, Lending, Yield Farming and Stable Coins which you can take advantage of to make extra money on the side. Research & Development Blockchain is revolutionizing our digital world and we want to transform the technology to innovation products https://finance.metropolisdao.org