Yield Aggregator

How yield aggregators work

The basic mechanism:

• User deposits assets into aggregator vault.
• Aggregator deploys capital across multiple yield sources.
• Auto-rebalances to optimize returns.
• Auto-compounds earnings.
• Charges fee — typically performance-based.

The aggregator handles complexity that would be impractical for individual users.

Common aggregator strategies

Several patterns:

• Lending optimization — rotate between Aave, Compound, others for best rates.
• LP optimization — pick best liquidity pools.
• Yield farming — chase token rewards.
• Strategy-specific — delta-neutral, basis trade, etc.
• Cross-chain — deploy across multiple chains.

Each strategy has different risk profiles.

Why aggregators exist

Several rationales:

• Gas efficiency — pooled operations spread costs.
• Time savings — users don't manually monitor.
• Strategy expertise — sophisticated strategies require expertise.
• Auto-compounding — captures small yields that don't justify manual gas.
• Optimization — better than most users can do alone.

The convenience-vs-fee trade-off is generally favorable for passive users.

Major aggregators

Notable examples:

• Yearn Finance — pioneer aggregator on Ethereum.
• Beefy Finance — multi-chain auto-compounder.
• Convex — specialized for Curve LP positions.
• Various chain-specific aggregators.

Yearn established the model in 2020.

Aggregator fees

Typical structure:

• Performance fee — 10-20% of profits.
• Management fee — 0-2% annually.
• Withdrawal fee — sometimes; usually small.
• Net yield — gross yield minus fees.

Compare net yields, not gross.

Risks

Several layers:

• Strategy risk — the strategy may fail or underperform.
• Underlying protocol risk — aggregator inherits risk of all protocols used.
• Smart contract risk — aggregator code itself.
• Strategist risk — strategy curators may have conflicts or make errors.
• Token risk — yields paid in tokens that may decline.

Aggregators stack risks.

Aggregator selection

Considerations:

• Track record — established aggregators have less unknown risk.
• Audit history — favor audited contracts.
• Strategy transparency — understand what's happening.
• TVL trends — growing TVL suggests trust.
• Net APY after fees.

Past performance doesn't guarantee future results, but extreme outliers should be questioned.

What individuals should know

For passive yield seekers:

• Aggregators simplify DeFi yield significantly.
• Read strategy docs — understand what vault does.
• Don't concentrate in single aggregator or strategy.
• Net yields matter, not gross.

For active users:

• Aggregators convenient but extract fees.
• Manual yield farming can be more profitable for sophisticated users.
• Trade-off between convenience and edge.

Yield aggregators are foundational DeFi infrastructure for passive yield. They simplify complex operations but stack risks; understanding what they do and the underlying protocols is essential to informed use.