Yield aggregators (often called auto-compounders) are automated financial services that pool user capital and deploy it across various external DeFi protocols (such as lending markets, DEXs, or staking platforms) to maximize returns. By batching user funds, they automatically harvest reward tokens, sell them for the underlying asset, and reinvest the principal, creating a highly efficient, passive compounding loop. Yield aggregators do not generate yield natively; they act as a convenience wrapper over the rest of DeFi. In exchange for this automation, they charge performance fees on the harvested yield, withdrawal fees, and keeper bounties. A CaaS rail can tap into this automated harvest-and-reinvest cycle, skimming a micro-fraction of the protocol’s performance fee before the net yield is returned to the vault depositors.
Auto-Compounding Performance Fee Redirect
Definition. Yield aggregators typically charge a performance fee (e.g., 4% to 10%) exclusively on the profits generated by the strategy (never on the principal). During the automated harvest function, a programmatic percentage of this exact protocol performance fee is redirected to a CaaS rail.
Value-stack tap. Product Wrapper Layer (a separate CaaS themed vault) / Smart contract surface.
Cost-bearer class. Project paid / LP-borne, surplus (subsidized from the aggregator’s revenue margin, leaving the user’s principal and net APY unaffected) / User paid (by using CaaS theme yield aggregators).
Example protocols. Beefy Finance, Yearn Finance.
Harvest Caller (Keeper) Bounty Skim
Definition. To keep the auto-compounding loop fully decentralized, aggregators offer a small financial bounty (a percentage of the harvest) to any external user or bot (a “keeper”) that pays the gas to trigger the harvest function. A micro-fraction of this automated keeper bounty can be diverted to the CaaS rail during execution.
Value-stack tap. Execution Surface (harvest function / keeper reward logic).
Cost-bearer class. User paid (extracted from the competitive gas-bounty buffer paid to automation bots).
Example protocols. Beefy Finance (harvest bounty).
Vault Exit / Withdrawal Surcharge
Definition. While depositing is often free, some yield aggregators enforce a microscopic withdrawal fee (e.g., 0.1%) when a user removes their capital from the vault, designed to prevent mercenary capital from exploiting the compounding cycle. A fraction of this exit penalty is sent directly to the CaaS rail.
Value-stack tap. Smart Contract Surface (vault withdrawal/redemption logic).
Cost-bearer class. User-borne (paid by users exiting the protocol strategy).
Example protocols. Various Yearn V2/V3 vaults.