Vault Economics: Who Actually Earns on an Auto-Compounder
A walk through the unit economics of LP vaults — manager fees, rebalance cadence, performance shares — and the conditions under which a vault beats running a position yourself.
A vault sells you two things: discipline you wouldn't apply yourself, and gas pooled across depositors. Strip those away and most LP vaults are a worse version of holding the underlying position — because the manager has to be paid.
Useful frame: a vault is profitable for you exactly when its operational savings exceed its take rate.
The fee stack
A typical L2 LP vault charges some mix of:
| Fee type | Typical range | Who it hurts most |
|---|---|---|
| Management | 0–2% / yr | Long-duration depositors |
| Performance | 5–20% of fees | High-APR depositors |
| Withdrawal | 0–0.5% | Short-duration tourists |
| Harvest gas | Pass-through | Small depositors |
The performance fee is the honest one — the manager only earns when you do — but it's also where stack-up surprises live. A 20% performance fee on a 30% APR strategy is 6 percentage points off the top, before you net IL.
The break-even depositor
For a vault to beat a self-managed position, the saved gas must exceed the manager's take. Concretely, if R is the rebalance count per year and g is the gas cost per rebalance:
const savedGas = R * g
const managerTake = perf * grossFees + mgmt * tvl
return savedGas > managerTakeSince g is roughly fixed per rebalance and amortized across all depositors, vaults pay off more for small depositors than for large ones — the big depositor would have been able to absorb the gas anyway. This is the opposite of what most marketing pages imply.
Where vaults outperform
Three real edges, ranked:
- Cross-pool routing — vaults that move liquidity between pools as fee tiers shift. Hard to do manually without an indexer.
- Rebalance discipline — most retail LPs procrastinate rebalancing; the vault doesn't.
- MEV protection — pooled txs through private mempools or batch routers, especially on Ethereum mainnet.
A 40% APR vault that rebalances weekly into the same one-sided trend is just a leveraged directional bet sold as yield. The APR is a function of regime, not skill.
What to check before depositing
- Last 30 rebalances on-chain — are they reactive or scheduled? Reactive wins.
- Manager-side concentration — if one address holds >40% of vault tokens, you're an LP for the manager.
- Withdrawal liquidity — a vault that takes hours to exit during volatility is a tax on your worst day.
The vaults worth using are the ones whose strategy you could replicate, but won't.