Day 18 — Yield, farming, and the risks

We touched on yield on Day 12 in the context of staking. Today we go deeper, because in DeFi the word "yield" gets applied to a dozen different mechanics, some of which produce sustainable returns and some of which are structurally Ponzis dressed up in protocol clothing.

The frame we built on Day 12 is the right one: where is the yield actually coming from? Apply it everywhere. The categories that follow are an extension of that question.

The four real sources of yield in crypto

1. Staking yield from validator rewards.

You stake ETH (or SOL, or AVAX, etc.) and the protocol pays you new tokens for participating in network security. The yield is roughly 3-7% for major proof-of-stake chains. The source is real: validators are doing actual work (verifying transactions, proposing blocks, getting paid in newly issued tokens plus transaction fees). You can verify it on-chain.

2. Lending interest from borrowers.

Day 16's territory. You deposit assets into a lending protocol. Borrowers pay interest to use them. You earn the interest minus a protocol fee. The yield is real but variable, typically 0.5% to 10%+ depending on the asset and market conditions. The source is real and visible on-chain (you can see the borrow demand directly).

3. Trading fees from liquidity provision.

Day 17's territory. You provide liquidity to a DEX pool. Traders pay fees on every trade. You earn a share of those fees. Yields vary wildly: stablecoin pools might earn 2-8% APR; volatile pairs can earn 20%+ but with significant impermanent loss risk. Sustainable, but accompanied by the impermanent-loss tradeoff we covered yesterday.

4. Real-world asset returns.

Tokenized money market funds (BlackRock BUIDL, Ondo USDY) pay yield from holding US Treasury bills. The yield matches the Treasury rate (4-5% in 2026). It's real because it's backed by actual Treasury holdings, structured as a regulated investment product. This is the category IMPCT cares about most for downstream reasons.

That's it. Those are the four real sources. Almost everything in DeFi that produces sustainable yield is some combination of these.

The four flavors of suspicious yield

1. Token emission farming (sometimes real, often not).

A protocol pays you in its own native token for using the platform. The displayed APY looks great because the token's price hasn't crashed yet. The yield isn't really money; it's the protocol diluting itself to bootstrap usage. If the protocol has real revenue from real activity, the emissions can be sustained or even useful. If it doesn't, the token price collapses as emissions hit the market, and the realized yield is much lower than the displayed APY (often negative).

The diagnostic: divide the protocol's annualized emissions value by its actual revenue. If emissions are 10x revenue, the protocol is paying its users with future dilution. That's a Ponzi in slow motion.

2. Real yield from new investor deposits.

This is the Anchor/Celsius/UST pattern. The protocol claims to pay yield from "DeFi strategies" or "trading strategies." When you look at the on-chain flows, the yields come from new deposits funding the interest payments to earlier deposits. Eventually inflows stop, and the system collapses. UST's Anchor protocol paid ~20% APY on UST deposits. The yield was paid partially from a reserve that ran out, and partially from inflation of the LUNA token. Both ran out within days of each other in May 2022, taking the entire system down.

3. Hidden risk yield.

The yield is real but the risk is opaque. Restaking yields look high because you're earning rewards from securing additional services on top of the base chain. But you're also taking on layered slashing risk: if any of the services you've restaked to gets slashed for misbehavior, your underlying ETH can be slashed too. The yield is real, but it's compensation for risk most users don't understand they're taking.

4. Outright fraud.

The protocol claims yields. You deposit. The team disappears with the deposits. This is the "rug pull." It happens less often on the major chains than it did in 2021-2022, but it still happens, especially on newer chains and with anonymous teams.

How to filter any "earn X% APY" claim

Apply these four questions, in order. Anyone selling you yield should be able to answer them clearly. If they can't, walk.

Where is the yield coming from? Name the source: staking rewards, lending interest, trading fees, RWA returns, token emissions, or something else. If the answer is vague ("DeFi strategies," "our proprietary algorithm," "yield farming"), demand specificity.
Is the source verifiable on-chain? If yes, look at the actual on-chain data (DeFi Llama is your friend). If no, you're trusting an opaque off-chain operator. That's a different risk profile than DeFi proper.
Is the yield sustainable, or is it being subsidized by emissions or new deposits? Look at the protocol's revenue versus its emissions. If emissions are large relative to revenue, the yield is partly self-funded by dilution.
What happens to the yield if the underlying token's price drops 50%? If the yield is denominated in the protocol's own token, a price drop can wipe out the yield (and then some). Sustainable yield denominated in stablecoins or in major assets (ETH, BTC) is structurally different from yield denominated in a small-cap protocol token.

If the answers add up, the product may be worth using at a size you can afford to lose. If the answers don't, no number of testimonials, audits, or charts makes up for it.

A practical heuristic

For most participants who are new to DeFi yield, a simple staircase works:

Under 5% APY on a major stablecoin (USDC, USDT, DAI): Probably real. Lending interest, Treasury-backed RWA, validator-passthrough yield.
5% to 15% APY: Could be real (active LP, restaking, real-yield protocols), but requires understanding the risk you're taking.
15% to 30% APY: Almost certainly involves significant risk you haven't priced in. Could be token emissions masking real returns, could be high-leverage strategies, could be early-stage protocols subsidizing growth.
30%+ APY on stables: Treat as a casino bet at best. The math has to come from somewhere. Most of the time the somewhere is "newer depositors."

Apply this when you encounter any yield product. The yield in DeFi is real. The yields advertised are sometimes not.

Tomorrow we look at the riskiest part of crypto. Bridges. The infrastructure that moves assets between chains, the structural vulnerabilities that have produced multi-billion-dollar hacks, and why even thoughtful participants have been burned.

Glossary

Term	Definition
APY (Annual Percentage Yield)	The effective annualized return on an investment, accounting for compounding.
APR (Annual Percentage Rate)	The simple annualized rate, without compounding. APYs are usually higher than APRs for the same underlying rate.
Yield farming	Moving capital between protocols to chase the highest available yield, often capturing token-emission rewards.
Token emissions	The newly issued tokens a protocol pays out to incentivize usage. Often dilutes existing holders.
Real yield	Yield paid from genuine economic activity (fees, interest, RWA returns) rather than from token emissions or new deposits.
Restaking	Pledging staked ETH to secure additional services for additional rewards, accepting layered slashing risk. (Eigenlayer.)
Liquidity mining	Token-emission incentives paid to liquidity providers, on top of any real trading-fee yield.
Rug pull	A scam where the team behind a protocol disappears with deposits, often after artificially pumping the token's price.
Ponzi mechanics	A structure where returns to earlier participants are paid from contributions of later participants, sustainable only as long as inflows grow.

Reality check

You see a stablecoin yield product advertising 18% APY. Walk through what you would check, in order, before considering it.

The strongest sequence: (1) where is the yield actually coming from (named source, verifiable on-chain)? (2) is the source sustainable, or is it being subsidized? (3) what's the catastrophe scenario — what happens to the principal if their model breaks? (4) is the team and protocol auditable, and have they survived prior stress events? If all four answers are clean and specific, the product may be legitimate (some real-yield products do pay this rate during certain market conditions). If any one of them is murky, you have your answer.

Read deeper

1. How does staking work and where does the yield come from? by The Block (revisited)

The foundation for understanding yield.

Read on IMPCT (curated commentary) | Read original (theblock.co)

Deven's take. Re-read with Day 18's framework. Staking yield is the cleanest "real yield" in crypto. Use it as the baseline you compare other yield claims against. If a product is paying you significantly more than the equivalent staking yield, you're either taking on more risk or getting subsidized by emissions. There is no third option.

2. Eigenlayer and the restaking landscape

The newest layer of yield product worth understanding.

Read on IMPCT (curated commentary) | Read original (eigenlayer.xyz)

Deven's take. Restaking is the most innovative thing to happen to ETH yield since The Merge. It's also the most layered-risk thing to happen to ETH yield. The pitch: take your already-staked ETH and re-pledge it to secure additional services (oracles, sequencers, bridges, etc.) for additional rewards. The catch: if any of those additional services experiences a slashing event, your underlying ETH can be slashed. The risks are real and not always transparent. Worth understanding because restaking is now a meaningful component of the ETH yield landscape, but probably not worth participating in until you fully understand the layered slashing model.

3. Anchor / UST / Terra collapse retrospective (multiple sources)

The canonical case study in unsustainable yield.

Deven's take. Read at least one in-depth piece on this. Anchor offered ~20% APY on UST deposits. The protocol's "yield reserve" was being depleted continuously because borrowers paid less than depositors earned. The system was structurally underwater for months before it collapsed. The team kept refilling the reserve. When the reserve ran out, the peg broke, and the entire ecosystem collapsed in about a week. The lesson: even when the protocol mechanics look novel, the underlying math has to work. Anchor's didn't. The signs were visible months in advance to anyone looking.

4. Celsius bankruptcy filings and retrospectives (Bloomberg, Forbes, others)

The case study in centralized yield products dressed up as DeFi.

Deven's take. Celsius advertised yields up to 18% on customer deposits. Customers thought they were participating in "DeFi yield." They were actually depositing into a centralized crypto bank that was taking opaque off-chain leverage with their funds. When the leverage went wrong, Celsius froze withdrawals, declared bankruptcy, and customers lost billions. The CEO is in prison. The lesson is the same as Day 10: a custodial product with high yields is not DeFi, regardless of the marketing. Stay in the actual protocols when you can verify what's happening on-chain.

5. rekt.news (revisited)

Continuing case studies in DeFi yield gone wrong.

Deven's take. Pull up rekt.news periodically. Read three random write-ups. Pattern-recognize the failure modes. The categories repeat: oracle exploits, flash-loan attacks, admin-key compromises, governance attacks, and good old-fashioned token emission collapse. By the time you've read twenty of these, you'll have a sixth sense for "this protocol is a few months away from being a rekt.news entry."

Tomorrow

Bridges. The riskiest part of crypto infrastructure. Multi-billion-dollar hacks. The structural reasons they keep getting attacked. And what the safer alternatives look like for moving value between chains.

See you in the morning.