DefiLlama
The dominant DeFi data aggregator — TVL, yields, stablecoin supply, and protocol metadata.
DefiLlama is the de-facto reference for cross-protocol TVL (total value locked) and yield comparisons. StableLens uses DefiLlama as one input among several, normalising APY definitions, deduplicating cross-listed pools, and supplementing with direct on-chain reads where DefiLlama lags.