Architecture Overview

Flint vaults run on Lagoon Finance, a full-stack vault management system built around the ERC-7540 standard. It handles NAV-based settlement, role-based permissions, configurable fees, and asynchronous deposit and redemption flows. Contracts are written in Solidity, deployed on EVM chains, and audited by three independent firms.

How the stack is layered

User (USDC)
    |
    v
Lagoon Vault (ERC-7540)       <- smart contract layer
    |
    +-- Deposit Silo           <- pending deposits sit here until settlement
    +-- Redemption Silo        <- pending shares sit here until settled
    |
    v
lend.xyz / opLend             <- RWA bond origination protocol
    |
    v
Real Estate Operations         <- EUR-denominated debt positions

Core concepts

Concept	What it means
Asynchronous settlement	Deposits and redemptions are queued first, then settled at a defined valuation point
NAV	The price-per-share used at settlement, not at request time
Valuation	Proposed by the Valuation Provider, accepted by the Curator before it's applied
Settlement	The Curator batches pending requests and processes them at the approved NAV
Guardrails	On-chain price-per-share bounds that block abnormal valuation changes
Access control	Whitelist, blacklist, and sanctions list options for compliance

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Continue reading:

• Deposit & Redemption Flows
• Vault Valuation
• Roles
• Fees
• Access Control
• Upgradability