YE
Yearn is the original DeFi yield aggregator. Depositors put assets into Yearn vaults; strategies move that capital through underlying protocols (lending markets, Curve LPs, structured products) to maximize risk-adjusted yield, with all logic encoded in vault contracts and automated by keepers.
Yearn defined the playbook for vault-based yield in DeFi — V2 vaults, the strategist marketplace, and the yvToken design have been widely copied. YFI remains the governance token, and the protocol now spans multiple chains under the broader Yearn ecosystem.