Kelp vs Mantle Restaking: Risk or redemptions? (2026)

Both protocols operate on Ethereum and offer liquid tokens tied to staked ETH, but their products differ. Kelp focuses on liquid restaking: users deposit ETH or major liquid staking tokens and receive rsETH. Mantle Restaking, branded as mETH Protocol, combines liquid staking and restaking, with ETH deposits receiving mETH, a value-accruing receipt token.

Kelp has the much larger listed TVL, about $910 million compared with Mantle’s roughly $39 million. That size does not settle the choice, especially given Kelp’s April 2026 bridge exploit. Kelp reports two audits and a bug bounty, but the exploit and the resulting uncertainty around rsETH integrations are central considerations. Mantle’s smaller footprint comes with a more explicit redemption design and a Proof of Reserves page. Choose based on the risks and mechanics you can assess, not TVL alone.

Kelp’s key product is rsETH, which represents a restaked position and is described as integrated across lending protocols, optimisers, DEXs, CEXs and wallets. That breadth may be useful, but Kelp’s homepage liquidity claim predates the April 2026 incident. Aave froze rsETH markets after the exploit, and Kelp announced it would stop rsETH bridging on 20 networks. Treat older integration and liquidity claims cautiously.

Mantle’s mETH has a different practical feature: tiered redemptions. The project says small withdrawals use an Instant Buffer pool and take about one to five minutes; larger withdrawals route through Aave’s ETH market and take about 24 hours. The larger route depends on Aave liquidity, so it is not a guarantee of instant access. Mantle also says about 30% of its protocol is allocated to Aave, versus 0% for other LSTs. These are project figures, and redemption conditions can apply.

Neither protocol publishes a fee breakdown. Kelp displays APR and APY information and a calculator, but fee details and live values are not stated. Mantle quotes a net protocol APY of about 5.00%, but does not disclose the fee rate. That yield figure can change, so it should not be treated as a guaranteed return.

For both, Ethereum gas costs may apply when depositing or withdrawing. Kelp users may also face DEX fees or slippage if they exit by swapping rsETH rather than withdrawing. Mantle users may pay fees or spreads at third-party venues if they use mETH in other protocols. Check each project’s app and documentation for current costs and withdrawal conditions before committing funds. The information here does not establish which route will be cheaper for a particular amount or transaction.

Kelp’s two listed audits and bug bounty of up to $250,000 are relevant, but they do not remove risk. The April 18, 2026 exploit of its rsETH cross-chain bridge reportedly drained about $290 million. Responsibility is disputed: Kelp blamed LayerZero default settings, while others have pointed to Kelp’s configuration. The incident demonstrates that bridge and integration risks matter in addition to risks in the core contracts. Follow Kelp’s official communications for recovery or compensation details; these are not described publicly.

Mantle also has two audits listed, and its homepage says it has invested over $1 million in audits and security programs. It reports zero slashing incidents to date and links to reserve, collateral and validator information. However, audit firms and reports are not named publicly. Risks include smart-contract bugs, slashing, mETH trading below the value of its underlying ETH, and reliance on Aave for larger redemptions. Neither protocol is risk-free.

Mantle Restaking is the more defensible choice for an ETH staker who prioritises a published redemption path and reserve reporting. Its instant buffer and Aave-backed route explain how different withdrawal sizes are handled, although larger exits depend on Aave liquidity. Its lower TVL and additional DeFi dependencies still warrant caution.

Kelp may appeal to users seeking rsETH, a product with a larger listed TVL and a history of broad DeFi integrations. But the April 2026 bridge exploit changes the decision: the loss, disputed responsibility and announced reduction in bridging are substantial drawbacks. Do not treat past integration breadth or older liquidity claims as proof that rsETH remains equally usable after the incident. If you cannot accept uncertainty around Kelp’s bridge and recovery situation, Mantle is the clearer fit between these two. For either protocol, review current terms and risks before depositing.