Ethereum (ETH) and DeFi Pulse Index (DPI). Everything is built on Ethereum so the value of the network will be reflected in ETH. There are a few groups working in how to calculate the total value on chain as well as how this value should be related to and reflected in the price. DPI is a basket of DeFi tokens so you'll receive exposure to the big players through asset. You can think of this like an ETF.