Core Components

This section outlines the foundational modules that power the Fount protocol. Each component is modular, extensible, and designed to integrate with DeFi standards and compliance requirements.

1. Registry

Purpose: Central contract for managing protocol registrations and deployments.

Key Functions:

function setStrategy(address implementation, bool allowed) external;
function setHook(address implementation, bool allowed) external;
function setAsset(address asset, bool allowed) external;
function deploy(address implementation, string memory name, string memory symbol, address asset, uint8 assetDecimals, address manager, bytes memory initData) external returns (address strategy, address token);
function isToken(address token) external view returns (bool);
function allTokens() external view returns (address[] memory);
function allStrategies() external view returns (address[] memory);

Access Control:

• setStrategy: Requires STRATEGY_ADMIN

• setHook: Requires RULES_ADMIN

• setAsset: Requires PROTOCOL_ADMIN

• deploy: Requires STRATEGY_OPERATOR

Errors:

• ZeroAddress()

• UnauthorizedAsset()

• UnauthorizedStrategy()

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2. Strategy

Purpose: Manages off-chain and on-chain asset flows.

Types:

• BasicStrategy: Core abstraction

• ReportedStrategy: Oracle-based valuation

• GatedMintRWAStrategy: Includes approval flow for deposits

Core Functions (Basic):

function initialize(...) external;
function balance() external view returns (uint256);
function setManager(address newManager) external;
function sendETH(address payable recipient, uint256 amount) external;
function sendToken(address token, address recipient, uint256 amount) external;
function pullToken(address token, address from, uint256 amount) external;
function setAllowance(address token, address spender, uint256 amount) external;
function shareToken() external view returns (address);

Additional (ReportedStrategy):

function setReporter(address _reporter) external;
function balance() external view override returns (uint256);

Access Control:

• Strategy functions: STRATEGY_ADMIN or STRATEGY_OPERATOR

Errors:

• AlreadyInitialized()

• InvalidAddress()

• InvalidReporter()

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3. tRWA Token

Purpose: ERC4626-compatible token representing user shares.

Types:

• tRWA: Standard vault

• GatedMintRWA: With escrow & two-phase minting

Key Functions:

function deposit(...) public returns (uint256);
function mint(...) public returns (uint256);
function withdraw(...) public returns (uint256);
function redeem(...) public returns (uint256);
function addOperationHook(...) external;
function removeOperationHook(...) external;
function reorderOperationHooks(...) external;

GatedMint Functions:

function requestDeposit(...) external returns (bytes32);
function mintShares(...) external returns (uint256);
function batchMintShares(...) external returns (uint256);
function escrow() external view returns (address);

Events:

• Deposit, Withdraw, WithdrawalQueued

• HookAdded, HookRemoved, HooksReordered

Errors:

• HookCheckFailed(string)

• WithdrawMoreThanMax()

• NotStrategyAdmin()

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4. Hooks & Rules Engine

Purpose: Extends the protocol with compliance logic and operational restrictions.

Types:

• BaseHook: Abstract

• KycRulesHook: KYC/AML enforcement

• RulesEngine: Multi-rule aggregation

Hook Interfaces:

function onBeforeTransfer(...) external view returns (HookOutput);
function onBeforeDeposit(...) external view returns (HookOutput);
function onBeforeWithdraw(...) external view returns (HookOutput);

KYC Functions:

function allow(address account) external;
function deny(address account) external;
function reset(address account) external;
function isAllowed(address account) public view returns (bool);

RulesEngine Functions:

function addRule(address rule, uint8 priority) external;
function removeRule(address rule) external;
function setRuleEnabled(address rule, bool enabled) external;

Access Control:

• KYC_OPERATOR, RULES_ADMIN

Errors:

• ZeroAddress(), AddressAlreadyDenied(), InvalidArrayLength()

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5. Reporters

Purpose: On-chain oracle system for asset price feeds.

Types:

• BaseReporter: Abstract interface

• PriceOracleReporter: Real-time oracle

Key Functions:

function getLatestPrice() external view returns (uint256);
function report() external view returns (bytes memory);
function update(uint256 price) external;
function setMaxDeviation(uint16 deviation) external;

Access Control:

• update: PRICE_UPDATER

• setMaxDeviation: PROTOCOL_ADMIN

Errors:

• StalePrice(), ExcessiveDeviation()

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6. Role Manager

Purpose: Role-based permissions management.

Key Functions:

function grantRole(address user, uint256 role) public;
function revokeRole(address user, uint256 role) public;
function setRoleAdmin(uint256 targetRole, uint256 adminRole) external;
function renounceRole(uint256 role) external;
function hasRole(address user, uint256 role) public view returns (bool);

Role Constants:

PROTOCOL_ADMIN = 1
STRATEGY_ADMIN = 2
RULES_ADMIN = 4
STRATEGY_OPERATOR = 8
KYC_OPERATOR = 16
PRICE_UPDATER = 32

Access Control:

• setRoleAdmin: Requires PROTOCOL_ADMIN

• Role management must be performed by an appropriate admin

Errors:

• Unauthorized(), InvalidRole()