Where does the yield come from?

Decentralised finance recreates lending, trading and derivatives as smart contracts. No company holds your assets, the terms are in code that anyone can read, and it runs continuously. The technology works, which is the part that surprises critics. The economics are where people lose money.

The question that filters everything

Any advertised yield must be paid by someone. There are only four honest answers.

A borrower pays interest. Lending protocols match depositors with borrowers who post collateral worth more than they borrow. Rates float with utilisation. This is real and understandable, and the yield is low when demand to borrow is low, which is most of the time.

A trader pays a fee. Providing liquidity to a decentralised exchange earns a share of trading fees. Real, and accompanied by a cost most providers underestimate, discussed below.

A protocol pays for security. Staking rewards are new issuance paid to validators for securing a network. Real, and diluting everyone who does not stake.

A government pays a coupon. Tokenized treasury funds pass through the yield on short-term government debt. The most boring and most reliable source in the entire sector.

If none of these describes where the return comes from, the answer is the fifth one: new tokens are being printed and their price depends on continued buying. That is not a yield. It is a distribution, and it ends when the emissions stop or the buying does.

The cost liquidity providers forget

Supplying two assets to a trading pool exposes you to what is politely called impermanent loss. If the price ratio moves, the pool automatically sells the riser and buys the faller, so you end up with less of the asset that went up. Compared with simply holding both, you are behind, and the gap grows with how far the ratio moved.

Trading fees compensate for this and frequently do not. For a volatile pair in a trending market, fee income can be a fraction of the divergence cost. This single mechanism explains a large share of the disappointment of the 2020 to 2022 period, and it is arithmetic rather than misfortune.

The four technical risks, ranked

Smart contract risk. A bug lets someone drain the pool. Audits reduce this and do not eliminate it, and the largest losses have been in bridges and newly deployed contracts.

Oracle risk. Protocols need outside prices to decide when to liquidate. Manipulate the price feed and you can trigger or avoid liquidations. Several eight-figure exploits are exactly this.

Liquidation risk. Your own collateral gets sold automatically when its value falls, at the worst moment, with a penalty. Positions that look safe at a 60 percent loan-to-value do not survive a 40 percent overnight move.

Governance risk. Token holders can change the rules. If voting power is concentrated, the rules can change against you.

What matured

The sector is smaller in participants and more serious in composition than at its 2021 peak. Lending protocols with years of continuous operation, conservative parameters and real fee revenue have survived multiple crashes and liquidated correctly through them, which is a genuine engineering result. Tokenized treasuries brought an asset with a yield that does not depend on crypto activity at all.

What has not been solved is the user experience of self-custody and the fact that a mistake is final. That is a design problem with real consequences, covered in our read on custody.

What to watch

Watch fee revenue rather than total value locked, because locked value can be rented with emissions and fees cannot. Watch how protocols behave in a violent liquidation event, which is the only real test. And watch whether regulated institutions use these rails for anything other than treasuries.