What is Mantle Restaked Ether (CMETH)?

Quick Facts

• Token symbol: CMETH
• Issued by: mETH Protocol, governed by Mantle
• Token type: Composable liquid restaking token (LRT)
• Underlying asset: mETH restaked across EigenLayer, Symbiotic, and Karak
• Blockchain: Deployed on Ethereum L1, composable on Mantle Network L2
• Governance token: COOK (separate governance token for mETH Protocol)
• Cross-chain: Supports cross-chain transfers via LayerZero OFT standard

Introduction

Mantle Restaked Ether (cmETH) is a permissionless, composable liquid restaking token (LRT) issued by mETH Protocol. It represents ETH that has been restaked across a diversified portfolio of restaking platforms, allowing holders to earn enhanced yield while retaining full liquidity and composability across DeFi.

cmETH builds on top of mETH — Mantle's liquid staking token — by adding an additional restaking layer, unlocking further yield opportunities without sacrificing capital efficiency.

History & Background

mETH Protocol was launched in late 2023 as Mantle's flagship liquid staking product, deployed on Ethereum L1 and governed by Mantle. It quickly grew to rank among the largest ETH liquid staking protocols by Total Value Locked (TVL).

cmETH was introduced as the protocol's next evolutionary step, expanding beyond simple liquid staking into the restaking arena — tapping into platforms like EigenLayer, Symbiotic, and Karak to offer users additional layers of yield.

How Mantle Restaked Ether Works

The process follows a two-step flow. First, users stake ETH with mETH Protocol and receive mETH, a value-accumulating receipt token. They can then deposit mETH into the restaking layer to receive cmETH — a 1:1 receipt token for that restaked mETH.

cmETH accumulates yield from multiple sources: Ethereum proof-of-stake rewards (via mETH), restaking protocol rewards from EigenLayer, Symbiotic, and Karak, as well as yields from Actively Validated Services (AVSs) and ecosystem partner incentives.

Users opt in to cmETH voluntarily, choosing its combined risk-reward profile over the simpler mETH. The protocol uses non-custodial core smart contracts and off-chain services with strict risk limits to maximize security.

Tokenomics

cmETH is a value-accruing token — it typically trades slightly above the price of ETH due to accumulated staking and restaking yields. Its supply is not fixed; it grows in proportion to the amount of mETH restaked through the protocol.

The token is designed to be used as productive collateral: both mETH and cmETH can be leveraged across DeFi money markets, perpetual trading platforms, and centralized exchange earn programs. The protocol charges approximately 10% of rewards as a protocol fee.

Ecosystem & Use Cases

cmETH is deeply integrated within the Mantle ecosystem. Key use cases include:

• Providing liquidity in mETH/cmETH liquidity pools on Mantle DEXs
• Using cmETH as collateral in DeFi money markets
• Earning yield in partner CEX earn programs (including Bybit)
• Cross-chain transfers without slippage via the LayerZero OFT standard

Team, Governance & Community

mETH Protocol is built and governed by Mantle, a modular Ethereum Layer-2 ecosystem. Protocol governance is managed through COOK, the dedicated governance token that allows holders to vote on proposals and shape protocol parameters.

The team emphasizes security, having invested over $5.2 million in audits and security programs, and maintains a Guardian network alongside top-tier infrastructure providers — achieving zero slashing incidents to date.

Advantages

• Dual yield: Combines Ethereum staking rewards with restaking protocol rewards for enhanced returns.
• Capital efficiency: cmETH can be used as collateral across DeFi and CeFi platforms simultaneously.
• Composability: LayerZero OFT standard enables seamless cross-chain transfers without slippage.
• Opt-in risk: Users choose their preferred risk-reward profile between mETH and cmETH.
• Security focus: Non-custodial design, extensive audits, and zero slashing history.

Risks & Challenges

• Restaking risk: cmETH inherits both liquid staking risk and the additional risk-reward profile of restaking platforms like EigenLayer.
• Smart contract risk: Dependence on multiple integrated protocols (EigenLayer, Symbiotic, Karak) increases attack surface.
• Liquidity risk: Redemption timelines can vary; large withdrawals may depend on validator queue and liquidity buffer availability.
• Governance concentration: As a Mantle-governed protocol, decentralization of decision-making is still evolving.

Long-Term Vision

mETH Protocol aims to become the leading vertically integrated staking and restaking protocol in the Ethereum ecosystem. By combining liquid staking, restaking, and deep DeFi composability under one roof, cmETH is positioned as a cornerstone yield-generating asset within the Mantle ecosystem and beyond.

As restaking matures and AVS adoption grows, cmETH's yield sources are expected to diversify further, reinforcing its role as a capital-efficient, multi-layered ETH yield instrument.