Mantle (mETH) Review

mETH is the liquid staking token of mETH Protocol, set up through Mantle governance. You deposit ETH and receive mETH, which becomes redeemable for more ETH as rewards accrue. In the liquid staking ranking it now scores 8.2 out of 10 on five equally weighted criteria, up from 6.6. The whole change is one corrected finding. The July review said the contracts repository had no licence file. It has one, an MIT licence in a file spelled LICENCE. With that fixed, mETH's weakest mark is operator decentralisation: five named, permissioned operators.

How Mantle mETH scores in liquid staking

Each criterion is marked 0 to 10 and carries the same 20% weight. The basis is desk research of primary sources on 1 November 2026, not a test deposit or redemption.

The arithmetic: (8 + 8 + 6 + 10 + 9) / 5 = 41 / 5 = 8.2.

What changed: licence and code openness rose from 2 to 10. The rubric reads the licence from the contract repository, and a missing file scores lowest. The July check looked for a file named LICENSE and missed the British spelling. The MIT grant meets the same standard as Origin's MIT repository, which also scores 10. The other four marks are unchanged: the fee, redemption, operator and audit pages say what they said in July, with a longer audit list.

Strongest criteria: open code, audits and a fee-free exit

Licence & code openness (10). MIT is a permissive open-source licence. It lets anyone read, reuse and modify the code, so outside reviewers can check what is deployed. The repository was last updated in May 2026 and is not archived.

Audit disclosure (9). The page groups audits by release. Six reviewed the original mETH contracts in 2023. Six covered cmETH and the COOK token in 2024. Four checked the Liquidity Buffer in October and November 2025. The 2023 reports link to each firm's own public repository. The later ones are attached as files on the page. Eight firms are named. The mark matches Stader's, Origin's and Liquid Collective's 9. It is not a 10 because the 2024 and 2025 reports sit only on Mantle's own page, not with the auditors.

Exit & redemption (8). The rubric places a stated queue and a stated fee above vague wording. mETH states both: no fee, and a minimum wait of about 12 hours. The overview gives a worst case of 40 days or more if the buffer runs short. Since 24 October 2025 the Liquidity Buffer has held unstaked ETH to pay redemptions sooner. Mantle labels it "live, capped production testing" and lends the ETH on Aave, so it carries lending-market risk. The mark sits one below Ankr and Jito (9), whose instant exits have a stated price.

Weakest criteria: what is measured and what is not

Operator decentralisation (6). This is a measured finding, not a gap. Five firms run the validators and no route for others to join is described. The rubric scores a named permissioned set honestly as such. That places mETH level with Liquid Collective's six named operators (6), above Origin Ether's single provider (3) and well below the open entry of Stader and Puffer (9). The docs say operators cannot move staked ETH, because withdrawal addresses point to a protocol contract.

Commission clarity (8). The figure is published, but as "approximately" 10% and without saying where it goes. The 4 basis point deposit adjustment is extra: 0.004 ETH on a 10 ETH deposit. Stader and Frax Ether score 9 because they publish their splits. Our guide to staking returns after costs shows how deposit charges and exit time add to the headline fee.

What the score does not cover

• Upgrades. The contracts upgrade through one timelock whose default delay is zero, controlled by a Mantle Security Council multisig. An upgrade can therefore take effect at once. Governance controls are not a criterion.
• Access. The app's terms exclude US persons, sanctioned countries and Russian-controlled regions of Ukraine. Availability is not scored.
• cmETH. The restaking receipt adds the slashing and contract risks of other networks. It is a liquid restaking product and is graded in our liquid restaking ratings, not here.
• Bridging to Mantle. mETH moved to the Mantle network depends on the canonical bridge as well as the staking contracts. Bridge risk is not scored.

Mantle mETH vs Origin Ether and Liquid Collective

In the liquid staking ranking, two Ethereum entries below mETH are Origin Ether and Liquid Collective. Both were re-checked on 1 November 2026.

mETH leads Origin Ether by 0.6 on the operator mark alone: Origin's validators now run on one provider, against mETH's five named operators. The other four marks are level. mETH leads Liquid Collective by 1.6 points: six on licence, because Liquid Collective's code is under the Business Source License, and two on exit, because mETH redeems without the allowlist and has a buffer that pays out at once.

Who this rating suits

The score is most useful to a holder who wants open-source code, a long audit list and a fee-free redemption with a stated minimum wait. It is less suited to someone who wants validators spread across an open operator set, or who is uneasy that upgrades have no timelock delay. The rating describes published terms on one date. It is not a recommendation to stake and does not assess any individual's circumstances.