DefiLlama

DefiLlama aggregates decentralized finance data, most prominently total value locked across protocols and chains.

Its methodology is published and its code is open, which matters in a sector where TVL figures have been inflated by double-counting the same assets across linked protocols.

It covers yields, fees, revenue and stablecoin supply alongside TVL, making it the usual starting point for assessing the size and activity of a DeFi protocol.