Yearn Finance is a DeFi protocol that pools deposits into “vaults” and runs automated strategies to earn yield on them, mainly by lending, providing liquidity and compounding rewards across other protocols. You deposit a token such as USDC or ETH, receive a vault share token, and the share becomes redeemable for more of the underlying asset as strategies earn. YFI, its governance token, became famous in 2020 as the purest “fair launch” in DeFi. If you’re asking what is Yearn today: it’s a smaller, older protocol than at its 2021 peak, still running vaults on Ethereum and several other networks, with a security record that includes three notable exploits.
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Key takeaways
- Yearn automates yield farming: vault strategies move deposits into lending markets and liquidity pools and compound returns.
- YFI launched in July 2020 with no presale, no VC round and no team allocation; total supply is capped at 36,666.
- Andre Cronje created Yearn and stepped back from DeFi in 2022; the protocol is run by contributors and YFI governance.
- Yearn has suffered exploits in 2021, 2023 and November 2025 (the roughly $9 million yETH incident), each in specific products rather than all vaults.
- Vault yields are variable and depend on the underlying protocols; check fees and risk notes on each vault’s page.
History: From iEarn to a DeFi Blue Chip
2020: Andre Cronje’s side project
Yearn began in early 2020 as iEarn, a tool built by South African developer Andre Cronje to automatically shift stablecoin deposits between lending protocols such as Compound, Aave and dYdX, whichever paid most at the time. On July 17, 2020, he launched the YFI token with a blog post that famously described it as a token with “0 financial value.” There was no sale and no pre-mine: all 30,000 YFI were distributed within about a week to users who provided liquidity to Yearn’s pools.
If you still hold Fantom tokens, our FTM price prediction explains why FTM no longer has a future of its own after the Sonic swap.
It became the defining moment of “DeFi summer.” Traders who’d farmed YFI for free watched it climb past the price of Bitcoin within two months, at one point exceeding $40,000 per token. The fair-launch model, where insiders had to earn tokens like everyone else, influenced a generation of later launches.
2020–2021: Vaults, mergers and a supply increase
Yearn introduced vaults, which went further than lending optimisation by running multi-step farming strategies, especially around Curve stablecoin pools. Late in 2020 it announced a run of partnerships and mergers, including Pickle Finance, Cover Protocol, Akropolis and Cream Finance, and a development partnership with SushiSwap. Not all of these lasted, but they cemented Yearn as a hub for “money lego” DeFi.
In February 2021, YFI holders approved a governance proposal (YIP-57) to mint 6,666 new YFI to fund contributors and the treasury, taking total supply to today’s 36,666. Fair-launch purists objected, but the vote passed and the cap has held since.
2022: Cronje steps away
In March 2022, Andre Cronje and fellow developer Anton Nell announced they were leaving DeFi. Yearn was already run by a distributed team of contributors, and the vaults kept operating. Cronje later returned to build on Fantom, now Sonic, but not on Yearn.
2023–2026: V3, smaller TVL, ongoing incidents
Yearn rebuilt its architecture as V3 vaults using the ERC-4626 tokenized-vault standard, letting a single vault allocate across many strategies with risk scores and caps. It also launched products such as yCRV (a liquid wrapper for Curve’s locked CRV), the yETH liquid-staking basket, and in January 2026 a stablecoin vault, yvUSD. Yearn also powered pre-deposit vaults for Katana, a chain incubated by Polygon Labs and GSR.
Total value locked has fallen a long way from 2021, when Yearn held billions; by October 2026 DefiLlama tracked it in the low hundreds of millions of dollars. Competition from Morpho, Pendle and lending-protocol “earn” products has drawn users who used to need an aggregator.
Security Record: The Incidents to Know
| Date | What was hit | Approximate impact |
|---|---|---|
| February 2021 | V1 DAI vault, through a manipulation of Curve pool pricing | About $11 million in vault losses, of which the attacker kept roughly $2.8 million |
| April 2023 | A legacy iEarn yUSDT contract with a years-old misconfiguration | About $11 million drained from legacy pools |
| November 30, 2025 | The yETH stableswap pool (a numerical bug let the attacker mint enormous amounts of yETH from a 16-wei deposit) | About $9 million; Yearn recovered roughly a quarter and said V2/V3 vaults were unaffected |
The pattern: each incident hit a specific older or specialised product rather than the main vault system. But deposits depend on Yearn’s code and the code of every protocol a strategy touches, so risk compounds.
How Yearn Vaults Work
- You deposit an asset, say USDC, into a vault and receive a share token (e.g., yvUSDC).
- The vault allocates deposits across one or more strategies: supplying to lending markets such as Aave or Morpho, providing liquidity on Curve and staking the LP tokens via Convex, and similar.
- Harvests compound returns. Periodically, strategies claim rewards, sell them for more of the underlying asset and redeposit. The share token’s price per share rises; your number of shares doesn’t change.
- You withdraw by redeeming shares for the underlying asset, minus any fees, subject to available liquidity.
The value Yearn adds is gas socialisation and automation. Compounding a $2,000 position by hand on Ethereum mainnet can cost more in gas than it earns; a vault does it once for everyone. Background on the protocols strategies use: Curve, Convex and Aave.
Tokenomics: YFI
- Maximum supply: 36,666 YFI (30,000 at launch plus 6,666 minted in 2021). Circulating supply is slightly lower because some sits in the treasury.
- Utility: Governance over vault parameters, fees, treasury and contributor budgets. Yearn has experimented with how value reaches holders, including vote-locking (veYFI) and buybacks funded by protocol revenue. Check Yearn’s governance forum for the current mechanism, since it has changed more than once.
- Revenue source: Vault management and performance fees, which vary by vault; some newer vaults charge none.
The tiny supply means YFI’s unit price is high, but that says nothing about value: market cap is what matters. More on reading supply data in our tokenomics guide.
How to Use a Yearn Vault (Step by Step)
- Set up a wallet such as MetaMask or Rabby and fund it with the asset you want to deposit plus ETH (or the relevant network’s gas token) for fees.
- Go to the official app at yearn.fi. Type it yourself or use a bookmark; fake DeFi front-ends are a common phishing trick.
- Pick a network and vault. Compare the displayed APY (historical, not promised), total deposits, fees and the strategy description. Prefer larger vaults with longer track records.
- Approve and deposit. Your wallet will ask for a token approval, then the deposit transaction. Approve only the amount you’re depositing if your wallet allows custom limits.
- Monitor occasionally. Watch Yearn’s official channels for incident notices, and revoke old approvals periodically using a tool like Revoke.cash.
How to buy YFI
YFI is listed on major exchanges including Coinbase, Kraken and Binance (availability varies by country) and trades on Ethereum DEXs. If buying on-chain, confirm the contract address via CoinGecko or Etherscan. Be aware that YFI’s on-chain liquidity is thinner than its exchange liquidity, so large DEX trades can suffer meaningful slippage.
Yearn vs Doing It Yourself vs Alternatives
| Approach | Pros | Cons |
|---|---|---|
| Yearn vault | Automated compounding, shared gas, curated strategies | Stacked contract risk, fees, less control |
| Supply directly to Aave/Morpho | Fewer contract layers, transparent rate | No auto-strategy switching; you manage it |
| Other aggregators (e.g., Beefy) | Many chains and pools | Similar layered risks; quality varies by vault |
For a broader look at how these strategies fit together, see our yield farming guide.
Risks and Is YFI a Good Investment?
- Composability risk: A bug in any protocol a strategy uses can cause losses in the vault.
- Shrinking relevance: TVL has fallen sharply since 2021; fee revenue depends on deposits.
- Governance changes: The YFI value-accrual model has shifted over time and may shift again.
- Thin liquidity: YFI can move sharply on relatively small trades.
A bull case rests on Yearn regaining deposits through new products like yvUSD and through being the vault layer for new chains. A bear case is continued drift as users go straight to lending markets. Either way, YFI is a high-risk DeFi governance token, best sized as a small position.
FAQ
Is Yearn Finance safe to use?
No DeFi protocol is risk-free. Yearn has been operating since 2020, its main vault code has been audited repeatedly, and its most recent major incident (November 2025) was confined to the yETH product. But vaults rely on many external protocols, so start small, use the official site, and spread deposits.
Who created Yearn Finance?
Andre Cronje built Yearn in early 2020 and launched YFI that July. He left DeFi development in March 2022, and Yearn has since been maintained by a decentralized group of contributors funded through YFI governance.
Why is YFI’s price so high?
Because there are only 36,666 tokens. A high unit price with a small supply can still be a modest market capitalisation. Compare YFI’s market cap, not its price, with other DeFi tokens.
Does Yearn work on networks other than Ethereum?
Yes. Yearn has deployed vaults on several networks beyond Ethereum mainnet, including Layer 2s and Katana. Available vaults differ by chain, so select the network in the app before comparing yields.
Crypto is volatile and risky; this is education, not financial advice. Do your own research.
