Mellow Core Review 2026: Institutional Onchain Vaults

Mellow Core is the current vault architecture from Mellow, which describes itself as infrastructure for institutional vaults and onchain yield. It is aimed at institutions, neobanks, fintechs and asset issuers that want to launch Earn, treasury and RWA products under their own brand.

DefiLlama classes it as an onchain capital allocator and lists about $266 million in TVL, up 3.3% over seven days. It runs on Ethereum, Rootstock, Robinhood Chain, Mezo and Monad. DefiLlama shows 2 audits and no native token.

Its homepage is minimal, so details on specific vaults, yields and partners are not covered here. This review is based on the DefiLlama description and metadata only.

Mellow Core Vaults are a framework for building yield and treasury products. An operator such as a fintech, neobank or asset issuer sets up a vault with a mandate. The mandate lists who may deposit, which assets are supported, which venues the vault may use and how much can go to each.

Onchain verifiers enforce those rules, so a vault's allocations stay within its mandate. The vault tracks multiple assets in one accounting system, which allows more complex treasury or RWA products than a single-token pool.

Deposits and redemptions go through asynchronous queues. Instead of swapping instantly, requests are processed in batches or steps, which helps the vault manage liquidity across the venues it allocates to.

Fees are not published publicly available for this review. Vault-level management or performance fees, if any, would be shown by each vault or branded product, and Mellow's own documentation is the place to check.

Beyond protocol fees, users should expect normal network gas costs on the chain they use. Branded products built by partners may set their own fee terms.

DefiLlama lists 2 audits for Mellow, but the project does not name the auditors, scope or findings. Vault funds sit in smart contracts, so bugs, bad integrations with approved venues, or operator misconfiguration remain risks even with onchain verifiers. No incidents are described publicly.

Because vaults are run by different operators under mandates, the risk of each product depends on its allocations and eligible venues. Regulatory treatment of branded yield and RWA products may vary by region and depositor type. Review each vault's terms and the project's audit reports before depositing.

Mellow Core is mainly for institutions, neobanks, fintechs and asset issuers that want to offer yield or treasury products under their own brand. Crypto-native depositors comfortable with smart-contract risk and queue-based withdrawals may also use vaults built on it, if they meet the eligibility rules.