What Is mETH Protocol? Mantle's mETH Staking and cmETH Restaking

mETH is a receipt for ETH staked through the protocol ¹³. When you deposit ETH in the official app, the protocol mints mETH at the current mETH/ETH exchange rate and stakes the ETH with validators run by its node operators, currently named as P2P, Blockdaemon, Kraken Staked and A41 ³. You receive fewer mETH than the ETH you deposit once the rate has risen, because each mETH represents a growing amount of ETH as rewards accrue; see how liquid staking works.

The rate is set by the protocol, so staking or unstaking directly has no slippage. Buying or selling mETH on an exchange is different: the market sets the price and large trades can move it ¹. An oracle committee (a 3-of-6 quorum updating every 8 hours) reports validator balances, and separate roles exist for pausing the system and for the Mantle Security Council ¹.

mETH Protocol's site says it lends part of its ETH, about 30%, into Aave's ETH market to support withdrawals and add yield ². That allocation adds Aave's smart-contract and liquidity risk to the position.

cmETH is a 1:1 receipt for mETH that has been restaked ⁴. Restaking means reusing staked ETH to secure additional services (often called AVSs) in exchange for extra rewards; see what restaking is. mETH Protocol's white paper names EigenLayer and Symbiotic as restaking venues and says it delegates only to vaults that do not add slashing risk, a company statement CoinPulse has not verified ⁴. DefiLlama tracks this product separately as Mantle Restaking ⁷.

cmETH can be redeemed 1:1 for mETH, but redemptions follow the exit timelines of the underlying restaking protocols, so they can take longer than unstaking mETH ⁴.

The protocol takes 10% of mETH staking rewards and 20% of cmETH restaking rewards, and both are built into the displayed rate rather than charged separately ³⁴. For example, if validators earned 3% a year on the staked ETH, mETH holders would see about 2.7% after the 10% fee (illustrative). Ethereum gas applies to every deposit, conversion and withdrawal. The Terms allow new fees with reasonable notice ⁵.

There are three ways out, per the protocol's own documents ²³⁴:

1. Standard unstaking. Burn mETH and wait for Ethereum's validator exit queue. Timing depends on network-wide demand and is not fixed.
2. Faster redemption. The site describes an instant buffer for small redemptions (about 1 to 5 minutes) and an Aave-backed route for larger ones (about 24 hours, "conditions apply") ². The MiCA white paper lists a reliable sub-24-hour route for large redemptions as a future milestone, so treat fast exits as subject to available liquidity ³.
3. Sell on the market. Swap mETH or cmETH on a centralized or decentralized exchange, at the market price.

cmETH redemptions also include a delay; it was an 8-hour withdrawal delay that let the team stop stolen cmETH from being withdrawn in February 2025 ⁸.

mETH Protocol's Terms bar users in the United States, North Korea, Cuba, Iran, Syria and Russian-controlled regions of Ukraine, as well as sanctioned persons, and are governed by Hong Kong law ⁵. mETH and cmETH are also listed and integrated across many venues; the protocol names Bybit, Kraken, Pendle, Ethena and Fireblocks among more than 40 partners ². Access through those venues follows each venue's own rules.

• Smart-contract risk in mETH Protocol's contracts, the LayerZero bridge used for Mantle and HyperEVM versions, and Aave ²³. The site lists audits by Hexens, Secure3, MixBytes, Quantstamp, Veridise and BlockSec ²; audits do not guarantee safety.
• Slashing risk if a validator misbehaves; the protocol says it has had no slashing incidents to date ².
• Restaking risk from AVS rules and exit delays on EigenLayer and Symbiotic ⁴.
• Liquidity and depeg risk: mETH can trade below its redemption value when exits are slow.
• Governance and admin control: guardians can pause contracts, which protected funds in 2025 but also means withdrawals can be halted ¹⁸.