Ether.fi (ETHFI): What Is It? Definition & Explanation

Ether.fi is the pioneer and largest protocol in Ethereum's liquid restaking segment. Founded by Mike Silagadze (formerly of eToro) and going mainnet in Q1 2024, Ether.fi combines Ethereum staking with EigenLayer restaking in a single protocol, delivering multi-layered yield. The protocol's distinguishing feature is that it is non-custodial: unlike Lido and similar protocols, users always retain their withdrawal keys in their own wallets even after depositing ETH.

Ether.fi non-custodial architecture: diagram showing user, node operator, EigenLayer, and eETH flow

What Is Liquid Restaking?

After Ethereum's Proof of Stake (PoS) transition, staking ETH meant contributing to network security and earning yield — but that ETH was locked and couldn't be used in DeFi. Liquid staking (like Lido's stETH) solved this by issuing a representative token. EigenLayer then went one step further in 2024, enabling already-staked ETH to be restaked to secure additional security layers (AVS — Actively Validated Services).

Ether.fi combines both layers:

1. User deposits ETH → Ether.fi stakes it on Ethereum validators and restakes it on EigenLayer AVSes.
2. User receives eETH: a liquid token that automatically accrues both Ethereum staking and EigenLayer yields.
3. weETH: The DeFi-compatible, non-rebasing wrapped version of eETH, usable as collateral in Aave, Curve, and other DeFi protocols.

Non-Custodial Architecture: The Difference from Lido

In traditional liquid staking protocols like Lido, users' ETH is staked with node operators' validator keys under the protocol's control. Users cannot access those keys. With Ether.fi:

• Withdrawal key: Stays in the user's own wallet; Ether.fi never has access.
• Validator key: Held by Ether.fi-approved node operators, but withdrawal authority remains with the user.

This distinction means unstaking authority always rests with the user. Even if the protocol is hacked or insolvent, the user can withdraw their ETH directly.

ETHFI Token Economics

The ETHFI token launched publicly (TGE — Token Generation Event) in March 2024. Significant airdrops were distributed to early depositors (Season 1 and Season 2 participants).

• Total supply: 1,000,000,000 ETHFI
• At-TGE circulation: Approximately 6% (60 million ETHFI)
• Use cases: Ether.fi DAO governance votes, protocol parameter setting
• Unlock schedule: The majority is locked 1–4 years for the team and investors, which could create significant selling pressure in later periods.

In the ecosystem, ETHFI provides governance voting power specifically; yield is earned through eETH/weETH tokens. Token price tends to move in parallel with general DeFi sector momentum and Ether.fi protocol TVL growth.

Ether.fi Cash: DeFi Credit Card

Ether.fi's product range extends beyond restaking. In 2024–2025 the protocol launched "Ether.fi Cash" — a non-custodial Visa card product. This card:

• Allows users to spend in the real world by posting crypto assets (ETH, eETH, weETH) as collateral without handing custody to the protocol.
• Differs from traditional crypto cards: users do not transfer their assets to a custodian for fiat conversion.
• Has launched in European and U.S. markets.

TVL and Ecosystem Growth

Ether.fi was among the fastest-growing DeFi protocols throughout 2024. TVL reached approximately $8 billion in the second half of the year, making Ether.fi the single largest deposit point in the EigenLayer ecosystem. Protocol revenue comes from validator commissions and AVS yields, with a portion directed to the DAO treasury.

COINOTAG Perspective

Ether.fi attempts to place restaking — still a debated risk vector in DeFi — within the most safety-focused non-custodial framework possible. From a technical design standpoint, user sovereignty is stronger compared to Lido. However, smart contract risk, AVS slashing risk, and the ETHFI token unlock schedule are factors investors need to monitor carefully.