What is real yield?

Real yield is return that a counterparty actually paid out of economic activity: interest from a borrower, a fee from a trader, a coupon from an issuer. The money arrives from outside the protocol. Return delivered by issuing new units of the protocol's own token is a different thing, and the two are frequently quoted in one number.

The distinction is old and has nothing to do with crypto: a dividend paid from earnings and a dividend paid by issuing new stock are both called a dividend, and only one of them makes the holder better off. Where onchain yield actually comes from is the same question asked one layer down.

What counts as real yield?

Return where you can name the payer and the reason they paid. Three cases cover most of it. A borrower pays interest on a loan. A trader pays a fee to whoever supplied the liquidity they traded against, and an issuer pays a coupon on an instrument, the coupon a tokenized treasury passes through to its holders.

You can see the dependency directly in the code that sets a lending rate. In Aave's interest rate strategy contract, the rate paid to suppliers is derived from the borrow rate scaled by how much of the pool is borrowed, and when there is no debt outstanding the contract returns a supply rate of zero. No borrower, no yield.

Where the other kind of return comes from

It comes from the protocol distributing its own token to the people using it. A protocol allocates a supply of tokens to a program and hands them to depositors over some period, and the economic effect is that existing holders are diluted so that new depositors are attracted, a marketing expense paid in equity rather than a return generated by the position.

That is not automatically bad, and treating it as fraud gets the analysis wrong. It is a legitimate way to bootstrap a market with no users yet, and venues that now produce genuine borrower interest went through the phase, so the problem starts only when it is presented as though it were the same thing as the interest.

Why does mixing the two inflate a headline APY?

The two components have completely different persistence, and adding them produces a number with no stated horizon. Borrower interest continues as long as there are borrowers, and an emissions program continues until its budget runs out, on a date somebody has already written down.

There is also a valuation problem underneath the arithmetic. The interest component is denominated in the asset you deposited, and the emissions component is denominated in a token whose value at the moment you sell it is unknown, and whose supply is being increased by the very program paying you. A single blended percentage hides both issues, and that is the number on dashboards, in comparison tables, and in the screenshot somebody brings to an investment committee.

When the program ends the rate falls to whatever borrowers are paying and the capital that arrived for the incentive leaves, both at the same time, so the exit crowd hits the pool exactly when the reason to stay has just disappeared.

How can you tell them apart from public information?

Follow the asset, not the label. Four checks work without access to anything private.

1. Ask what currency the return arrives in. Interest paid on a stablecoin deposit arrives in the stablecoin. If part of the return arrives as a different token that has to be claimed separately, that part is a distribution rather than a yield on the position.
2. Watch the share price. In an ERC-4626 vault, the value of a share is total managed assets divided by shares outstanding, so genuine earnings raise totalAssets and lift the value of the share you already hold. Rewards paid in an external token usually do not touch totalAssets at all, so if the quoted rate is much higher than the movement in share price, the difference is coming from somewhere else.
3. Look for an end date. Incentive programs have a budget, a schedule and usually a governance vote creating them. Borrower interest has none of those, because nobody voted for it.
4. Read the qualifier on the number. Rates presented as "including rewards" or "boosted" are disclosing the mix. Points programs are the extreme case: there is no token yet, so the advertised rate rests on an assumption about something that does not have a price.

What the distinction changes for an allocator

It changes the underwriting question from what the rate is to whether the rate survives the thing that is currently paying for it, and a mandate that treats the two components as one line item cannot answer that, or report to a committee what the position is expected to earn once an incentive schedule expires.

Separating the components of a quoted rate is the underwriting work, and each part is underwritten differently: the interest component against the activity paying it, the incentive component against the budget behind it, and both against the compounding convention used to state the number in the first place. Points programs are harder still, because nothing has a price yet. The structural view sits in onchain yield sources.

Frequently asked questions

Is real yield the same as sustainable yield?

Not quite. Real yield describes where the money came from, and sustainability describes whether it continues. A borrower-paid rate is real, and it can still collapse if borrowing demand disappears. The distinction is useful because it tells you which question to ask next: for emissions the question is when the budget ends, for real yield it is whether the underlying activity holds up.

Are token emissions always a bad sign?

No. Bootstrapping a market with token distributions is a normal way to attract the first users, and venues that now generate substantial borrower interest often started that way. The problem is disclosure rather than the mechanism, and a rate that separates the interest component from the incentive component can be underwritten, while a single blended figure cannot.

How do I find the real yield component of a quoted rate?

Compare the movement in the vault's share price over a period against the advertised rate: under ERC-4626 the share value is total assets divided by shares outstanding, so returns earned inside the vault show up there. Anything advertised beyond that movement is arriving through some other route, usually a separate claimable token.

Where does the yield on a tokenized treasury fund come from?

From the coupon on the underlying government debt, passed through to holders after the fund's fees. That is a counterparty payment in the same sense as borrower interest, with a different payer and a different settlement cycle, since the fund side runs on business days rather than blocks.