Euler Finance Review: Is Its Lending Worth Using?

Euler is a modular lending protocol: you can supply supported crypto assets to a market, or borrow assets against collateral accepted by that market. Its app also offers Euler Earn, described as a single deposit into a curated vault. Market creators can configure assets and lending rules, while apps and wallets can integrate Euler through its SDK. Permissioned markets are aimed at assets such as tokenized funds, gold and credit, with rules governing who can deposit, borrow or liquidate.

That flexibility means Euler is not one uniform lending pool with identical terms everywhere. The market you select determines which assets are accepted and how borrowing works. Its toolbox is intended for curators and risk managers who want to launch markets; it is not necessary for ordinary users who simply want to lend or borrow. The homepage lists 10 supported chains and shows markets on several networks, so check that the market you want is actually available on your chosen chain.

Euler does not publish a single platform-wide fee schedule in its product information. Your costs can depend on the market and transaction: supplying or withdrawing assets may require network gas, borrowing accrues interest, and a specific vault or market may have its own terms. Ethereum gas can vary with network demand; on other supported chains, the applicable network fee will differ.

Before supplying, review the displayed rate, any market-specific charges and the conditions for withdrawing. Before borrowing, check the interest rate and how it can change, how much collateral is required, and the liquidation threshold. A position can become unsafe if collateral loses value or borrowing costs and market conditions shift. Euler Earn is a separate curated-vault product, so examine its strategy and terms rather than assuming it has the same exposure or costs as direct lending. If the app does not make a cost clear for your chosen market, do not assume it is zero.

Euler lists more than 60 independent security engagements, formal verification by Certora for Euler V2 core and EulerEarn, and a bug bounty of up to $7.5 million. Those are meaningful security measures, but they do not guarantee that every market, integration or contract is safe. Check the security reports for the specific protocol components you plan to use, and remember that a market’s configuration and assets create risks beyond the core contracts.

Euler also has a serious incident in its history: the original Euler lending protocol was exploited in March 2023, with roughly $197 million initially taken. The attacker later returned the funds. That incident concerned the earlier protocol and should not be treated as proof that current versions have the same vulnerability, but it is relevant context when assessing risk. Euler’s product information does not state a licence. DeFi deposits are not bank deposits, and you can lose funds through contract bugs, bad market parameters, collateral losses or liquidation.

You use Euler with a crypto wallet and interact with smart contracts, so you need the correct network and the right asset for the market. The homepage lists 10 supported chains and shows examples across Ethereum, Base, Monad, Arbitrum and HyperEVM. Do not infer that every asset or feature is available on every chain: confirm the exact market and token in the app before approving a transaction.

For lenders, the practical choice is between supplying directly to a market and using Euler Earn’s curated allocation approach. For borrowers, you must confirm that the market accepts your collateral and that the available liquidity is sufficient. Euler also offers tools for app integrations and market creation, but those are aimed at developers and curators rather than everyday lending. The product information does not publish a general transaction-speed guarantee or a mobile-app specification, so your experience will depend on the connected wallet, network conditions and the product you use.

Euler’s choice of markets and configuration options can help experienced users find a specific lending setup, but it also puts more responsibility on you to compare risk. A market’s collateral rules, available liquidity and borrowing terms matter as much as the protocol brand. Tokenized assets may have additional issuer, eligibility or redemption risks; permissioned markets can restrict who is allowed to take part.

This is not a good fit if you expect a fixed return, principal protection, simple customer-service reversals or a single set of easy-to-compare fees. Euler’s product information does not state a licence, and its security engagements cannot remove smart-contract or market risk. If you are new to DeFi, start by understanding how collateralization and liquidation work before borrowing or supplying a meaningful amount. Avoid treating EUL as necessary for ordinary lending: the product information identifies the token but does not explain a requirement to hold it for using the lending app.