This article is about reading the box, not picking the highest number on the leaderboard. The difference between an 8% vault and a 14% yield vault is almost never skill — it is a different list of things that can go wrong.

• Yield comes from four places: borrower demand, trading fees, leverage, and token emissions. Only the first two are recurring revenue.
• Fees are charged on assets, not on outcomes. A management fee accrues whether the strategy works or not, so a flat year can still cost you money.
• Emissions are a subsidy. When a vault’s yield is mostly its own token, the rate is a marketing budget with a decay schedule attached.
• Read the unwind order. The strategy that performs best in calm markets is often the one with the longest queue when everyone leaves together.

What a yield vault actually is

A yield vault is an automated strategy wrapper: deposit an asset, receive a share token representing your claim on the pool, and let a keeper or a set of contracts rebalance the underlying position. Mechanically it resembles a fund; operationally it is usually a smart contract with an admin key, which is a different risk profile from a fund with a custodian.

Three components matter. The accounting determines how your share price is calculated and whether it can be manipulated. The strategy determines what the pool actually holds at any moment. The control surface determines who can change the strategy, pause withdrawals, or move funds to a new contract.

Most vault risk sits in the third component, and most vault marketing sits in the second.

The four levers behind every yield vault return

Every sustainable return in this category traces back to one of four sources. Identify which one is doing the work, and the vault becomes legible.

Lever 1: borrower demand

Lending markets pay because someone wants to borrow. The rate is real revenue paid by a counterparty with a reason to pay it — usually leverage, market making, or hedging. This is the cleanest source, and it is also cyclical: utilisation falls when leverage demand falls, and the rate follows.

Ask what happens at zero utilisation. A vault that only lends earns nothing when nobody borrows, and the management fee keeps accruing regardless.

Lever 2: trading fees and market making

Liquidity provision earns a share of swap fees in exchange for standing ready to trade against informed flow. The revenue is genuine but asymmetric: you accumulate the asset being sold, so fee income is compensation for adverse selection rather than free money.

Lever 3: leverage and looping

Looping means supplying collateral, borrowing against it, supplying again. It multiplies the base rate by the loop count and multiplies liquidation risk by the same factor. A 6% base rate looped four times is not 24%; it is 24% minus borrow costs, minus a liquidation threshold that is now much closer.

Lever 4: token emissions

Emissions are paid from a treasury or an inflation schedule. They are real cash flow to you only if you sell them, and selling them is what makes the price fall. A yield vault funded by emissions is a subsidy programme with a published end date, whether or not the documentation says so.

Reading a yield vault factsheet line by line

The factsheet is where the four levers are disclosed, usually in language designed to be skimmed. Read it as a list of claims to verify.

Two rows do most of the damage. A vault whose “instant liquidity” depends on borrowers repaying is liquid only in the state where you do not need it. And a 2/20 structure on gross yield can eat a large fraction of a modest return.

A yield vault is a promise about the future behaviour of a strategy under conditions the strategy has not yet experienced. The documentation describes the design, not the behaviour.

Worked example: where a 12% headline goes

Take a vault advertising 12% net APY on 10,000 USDC. The breakdown in its own documentation says 8 points come from lending and 4 points from emissions paid in the vault’s governance token at spot price.

Gross yield is 10,000 × 12% = 1,200 USDC equivalent. The emissions portion is 10,000 × 4% = 400 units of token, valued at the price on the day you read the page. If that token halves over the year, the realised value is 400 × 0.5 = 200.

Fees: a 2% management fee on assets is 10,000 × 2% = 200. A 20% performance fee on gross yield is 1,200 × 20% = 240. Total fees are 440.

Net result: 1,200 − 200 (token markdown) − 440 (fees) = 560, or 5.6% on 10,000. The headline said 12%. Nothing fraudulent happened; it measured a different thing than your balance did.

Stress it. If utilisation falls and the lending rate halves, gross yield drops to 10,000 × (4% + 4%) = 800, the token is still marked down 200, fees are 200 + 160 = 360, and the net is 240 — 2.4%, below a short-dated government bill in many jurisdictions, for considerably more operational risk.

Questions a yield vault should answer before you deposit

A vault that answers these in writing is doing the work; one that answers in a chat channel is not.

1. What is the split between recurring revenue and emissions, as a percentage of the advertised rate?
2. Which contracts hold the capital, and can the strategy be changed without a timelock?
3. What is the exact order of operations when withdrawals exceed available liquidity?
4. Are performance fees charged on gross yield or on gains above a benchmark?
5. What happened to the share price during the last market-wide drawdown, in percentage terms?
6. Who holds the admin keys, and what can they do without depositor approval?
7. Is the share token transferable, and does it trade at par when the vault is stressed?

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