The world's total supply of fiat money amounted to $157 trillion in the fourth quarter of 2019. The total addressable market opportunity could exceed the combined market cap of Saudi Aramco, Apple, Microsoft, Alphabet (Google), Amazon and Facebook. A fast growing vertical within the blockchain space is peer-to-peer banking, without the need of "fiat money" Bitcoin, ether, USDC and USDC are examples of "stable coins" that are used as a refuge from more volatile cryptocurrencies.