Yield farming means moving crypto between DeFi protocols to earn returns, usually by supplying liquidity or lending assets in exchange for fees and token rewards. Chasing the highest available rate, farmers move when it drops.
Practice began in June 2020, when Compound started distributing its COMP governance token to anyone supplying or borrowing on the protocol. An ordinary lending market became something worth moving capital across the ecosystem to reach. Total value locked across DeFi went from roughly $1 billion to $15 billion within months, and the period became known as DeFi summer.
How yield farming works
Four approaches, roughly by complexity.
Supplying liquidity. Deposit two tokens into an AMM pool and earn a share of trading fees, typically around 0.3% per trade.
Lending. Deposit assets into a lending protocol and earn interest from borrowers. With pool utilization, rates move.
Liquidity mining. On top of the base return, the protocol pays additional token rewards to attract capital it would not otherwise get.
Leveraged looping. Deposit collateral, borrow against it, deposit the borrowed funds, repeat. Both the return and the liquidation risk get amplified.
Where DeFi yield actually comes from
Here is the question that separates a sustainable return from a temporary one, and it is the only part of a yield figure genuinely worth checking before anything else.
| Source | Sustainable? | Notes |
|---|---|---|
| Trading fees | Yes | Paid by real users doing real trades |
| Borrowing interest | Yes | Paid by borrowers who want leverage or liquidity |
| Token emissions | Usually not | New tokens printed to attract capital, diluting holders |
| Protocol treasury | Temporary | Runs out |
An advertised 200% APY funded almost entirely by emissions is not a return. It is newly printed tokens whose price falls as more arrive. When emissions stop, so does the capital, and so does the token.
Checking the split between fee revenue and emissions tells you most of what you need.
Yield farming risks
DefiLlama's hack tracker records $7.6 billion in cumulative DeFi losses, with lending protocols accounting for roughly 28%.
- Smart contract risk. Bugs drain pools. Audits reduce this without eliminating it.
- Impermanent loss. As pooled assets diverge in price, the formula rebalances automatically, leaving you holding more of the loser and less of the winner. Fees do not always cover the gap.
- Liquidation. Falling below the collateral threshold closes leveraged positions automatically, at whatever price is available.
- Oracle manipulation. Protocols read prices from external feeds. Manipulated feeds trigger wrongful liquidations.
- Reward token collapse. Paid in a token that falls 80%, yield was not what the advertisement claimed.
- Rug pulls. New farms with anonymous teams and unaudited contracts remain common.
- Operational failure. The largest 2026 exploit, roughly $292 million from Kelp DAO in April, involved no contract flaw. Attackers compromised infrastructure and fed a bridge false data.
- Gas costs. On mainnet, frequent repositioning can consume the yield entirely.
APR, APY, and what the number hides
Advertised rates deserve skepticism, for specific reasons.
APY assumes the current rate holds for a full year and that every payout is reinvested. In DeFi, rates change block by block as utilization shifts, so a headline figure is a snapshot rather than a projection you can rely on.
Rates also fall as capital arrives. Advertising 40% attracts deposits, and those deposits dilute the same reward stream across more participants. What you see is frequently not what you get.
What DeFi summer showed
Worth understanding, since the pattern repeated afterwards.
Exactly as designed, Compound's COMP distribution worked. Capital flooded in, TVL rose fifteenfold, and other protocols copied the mechanism within weeks.
Then came the copies of copies. Anonymous forks with animal names, unaudited contracts, and rates existing only while emissions ran. Many failed. Some were never intended to work.
Surviving protocols, including Aave and Uniswap, generated real fee revenue. That distinction held then and holds now.
What to check before farming
- Fee revenue against emissions. Whether the yield survives the incentive program comes down to this split.
- Audit history and time deployed. Production track record matters more than audit count.
- TVL stability. Arriving for rewards means leaving when rewards stop.
- Who can change the contract. Operational risk concentrates in admin keys and upgrade authority.
- Impermanent loss exposure. Volatile pairs carry considerably more of it than correlated ones.
- Your total cost. Gas, deposit fees, withdrawal fees, and repositioning all come off the top.
None of that tells you whether farming suits you, which depends on your risk tolerance and how much you can afford to lose entirely.
Where mb.io fits
Trading custody risk for smart contract risk leaves you with no recourse when something fails.
mb.io takes the regulated route instead.
mb.io is backed by MultiBank Group, a financial institution founded in 2005 that serves more than 2 million clients across 100+ countries.
- Regulated by VARA in the UAE and AUSTRAC in Australia
- 10/10 security score from Hacken, an independent blockchain security auditor
- Institutional-grade MPC custody powered by Fireblocks, with segregated client funds
- A curated list of assets, so you're not sorting through thousands of tokens to find the ones worth trading
- Buy, sell, and swap in three steps, from sign-up to purchase
- 24/7 multilingual customer support
Open your account and start trading on mb.io.
Frequently asked questions
What is yield farming?
Moving crypto between DeFi protocols to earn returns, typically by supplying liquidity or lending assets in exchange for trading fees, interest, and token rewards.
When did yield farming start?
June 2020, when Compound began distributing COMP tokens to users. Within months, DeFi total value locked rose from roughly $1 billion to $15 billion, a period called DeFi summer.
Is yield farming profitable?
Sometimes, and the advertised rate is rarely what you receive. As capital arrives rates fall, reward tokens can collapse in value, and gas costs, impermanent loss, and exploits all reduce the outcome.
What is impermanent loss?
As two pooled assets diverge in price, the pool rebalances automatically, leaving you with more of the asset that fell and less of the one that rose. Against simply holding both, you can end up worse off.
Why are yield farming rates so high?
Usually because newly printed tokens fund them rather than real revenue. Emissions attract capital and dilute holders. When emissions stop, so does the rate.
Is yield farming safe?
Smart contract risk, liquidation risk, oracle risk, and no recourse all apply. DefiLlama's hack tracker records $7.6 billion in cumulative DeFi losses across the sector.
What is the difference between yield farming and staking?
Securing a Proof of Stake network and earning protocol rewards is staking. Yield farming supplies capital to applications built on top, earning fees and token incentives across a broader risk surface.
How do I tell if a yield is sustainable?
Compare fee revenue against token emissions. Funded by real trading and borrowing activity, yield survives. Funded by printing tokens, it stops when the program ends.
