What is Euler V2? The Rebuilt Modular DeFi Lending Protocol Explained (2026)

Euler V2 is a modular DeFi lending protocol launched in 2024, representing a complete architectural rebuild of the Euler Finance platform. The original Euler V1 suffered the largest DeFi exploit of 2023 — a flash loan attack in March 2023 that drained approximately $196 million. In one of DeFi's most remarkable recoveries, Euler Labs negotiated the return of the stolen funds within weeks, and all affected users were fully repaid. V2 was then redesigned with entirely new architecture, independent audits, and a focus on modularity and permissionless market creation. As of May 2026, Euler V2 holds approximately $416 million in TVL.

Euler Finance was founded by Dr Michael Bentley and launched in December 2021. The Euler V1 protocol introduced several novel concepts to DeFi lending, including reactive interest rates (which adjust algorithmically in response to market conditions rather than using fixed curves), soft liquidations (smaller, incremental liquidations rather than large single events), and permissionless market creation.

How Euler V2 Works: Modular Vaults

Euler V2 is built around a modular vault architecture. Each vault in Euler V2 is a standalone contract that manages a single asset, with its own configurable parameters including interest rate model, oracle, collateral factors, and supply/borrow caps. Vaults can be created permissionlessly — any user or protocol can deploy a new Euler V2 vault for any ERC-20 token.

Vaults interact with each other through the Ethereum Vault Connector (EVC) — a shared infrastructure layer that enables vaults to reference and depend on each other's state. For example, the EVC allows a vault to accept as collateral the shares of another vault, enabling complex nested collateral structures and cross-vault borrowing scenarios.

The permissionless nature of Euler V2 vault creation is similar to Morpho Blue's market creation — any asset can have a lending market without requiring a governance vote. Unlike Morpho Blue, however, Euler V2 vaults have more configurable parameters and the EVC provides a richer cross-vault interaction layer.

The Ethereum Vault Connector (EVC)

The EVC (Ethereum Vault Connector) is Euler V2's most architecturally novel component. It is a standalone on-chain contract that acts as a common interface and interaction layer between EVC-compatible vaults — not just Euler vaults, but any vault built to the EVC standard.

The EVC enables several powerful features: batch transactions (multiple vault interactions in a single transaction), controller vaults (one vault that manages health checks across multiple connected vaults), and operator accounts (third-party contracts that can act on behalf of a user across multiple EVC vaults with scoped permissions). These primitives make Euler V2 an unusually composable lending substrate.

Euler V2 vs Morpho Blue: Permissionless Lending Compared

Both Euler V2 and Morpho Blue allow permissionless creation of lending markets without governance approval. The differences lie in architecture: Morpho Blue markets are defined by five immutable parameters and are extremely minimal. Euler V2 vaults are more feature-rich, supporting reactive interest rates, complex collateral structures via the EVC, and more configurable risk parameters.

Morpho Blue is simpler and has been live longer (October 2023 vs Euler V2's 2024 launch). Euler V2 offers more composability through the EVC. Protocol integrators building sophisticated lending products may prefer Euler V2's richer primitives; those seeking minimal, audited simplicity may prefer Morpho Blue.

The EUL Token

EUL is Euler Finance's governance token, used to vote on Euler protocol governance decisions including supported collateral, protocol fees, and treasury management. EUL was distributed to historical Euler V1 users (including those affected by the exploit) and ongoing protocol participants. EUL holders can participate in Euler DAO governance.

Resupply Finance: Composable Yield on Lending Positions

Euler V2's modular architecture is designed to serve as a composable building block for more complex DeFi strategies. Resupply Finance takes a similar composability-first philosophy: users deposit yield-bearing Curve Lend (crvUSD) or Frax Finance (frxUSD) positions as collateral to mint reUSD, with the collateral earning its Convex-boosted yield throughout the loan. Resupply was co-built by Convex Finance and Yearn Finance, with RSUP governance rewards for participants.

This section is for informational purposes only. Nothing in this article constitutes financial or investment advice. DeFi protocols carry significant risks including smart contract vulnerabilities, oracle failures, and liquidation cascades. Always conduct thorough due diligence. Invest only what you can afford to lose.

Frequently Asked Questions: Euler V2

• What is Euler V2? Euler V2 is a modular, permissionless DeFi lending protocol rebuilt after the $196 million Euler V1 exploit of March 2023. It features configurable lending vaults, the Ethereum Vault Connector (EVC), and permissionless market creation. As of May 2026, it holds approximately $416 million in TVL.
• What happened to Euler V1? In March 2023, a flash loan attack exploited a vulnerability in Euler V1's donation mechanism, draining approximately $196 million. Euler Labs negotiated with the attacker over several weeks, and the stolen funds were returned. All affected users were fully repaid. Euler V2 was subsequently built from scratch.
• How does Euler V2 work? Euler V2 uses a modular vault architecture. Each vault manages a single asset with configurable parameters (oracle, interest rate model, LTV ratios). Vaults interact through the Ethereum Vault Connector (EVC). Markets can be created permissionlessly by anyone.
• What is the Ethereum Vault Connector (EVC)? The EVC is Euler V2's core infrastructure layer. It is a standalone contract that enables batch transactions, cross-vault collateral dependencies, and operator accounts (third-party contracts that act on behalf of users across multiple EVC-compatible vaults). Any protocol can build EVC-compatible vaults.
• Can anyone create a lending market on Euler V2? Yes. Euler V2 vaults are permissionless — any user can deploy a vault for any ERC-20 token with their chosen parameters. There is no governance approval required.
• What is the difference between Euler V2 and Morpho Blue? Both allow permissionless lending market creation. Morpho Blue markets are defined by five immutable parameters and are extremely minimal. Euler V2 vaults are more feature-rich and composable via the EVC. Morpho Blue has a longer track record; Euler V2 offers richer primitives.
• What is the EUL token? EUL is Euler Finance's governance token, used to vote on protocol governance decisions including fees, treasury management, and protocol parameters. It was distributed to Euler V1 users (including exploit victims) and ongoing participants.
• Is Euler V2 safe? Euler V2 was rebuilt entirely after the V1 exploit, with multiple independent audits. The V2 architecture addresses the vulnerability that allowed the V1 attack. Smart contract risk remains inherent in any DeFi protocol. The EVC adds complexity that creates additional attack surface beyond individual vaults.
• What assets does Euler V2 support? Euler V2 supports permissionless asset listing — any ERC-20 can have a vault. Curated 'Core' vaults for major assets (ETH, USDC, wBTC, etc.) have undergone additional auditing. 'Edge' vaults for long-tail assets are created permissionlessly.
• What chains is Euler V2 on? Euler V2 is deployed on Ethereum mainnet and has expanded to additional EVM-compatible networks.
• What is Euler V2's TVL? Euler V2 holds approximately $416 million in total value locked as of May 2026.
• What are reactive interest rates in Euler? Reactive interest rates (introduced in Euler V1 and carried into V2) adjust algorithmically based on market conditions, targeting a specific utilisation rate over time. Unlike fixed-curve models (which have static optimal utilisation points), reactive rates learn from recent utilisation history to dynamically recalibrate.
• Who founded Euler Finance? Euler Finance was founded by Dr Michael Bentley. The protocol launched in December 2021 and has been at the forefront of DeFi lending innovation despite the March 2023 exploit.