# ProtocolFeesController

The protocol Fees controller is used to manage protocol and pool creator fees for the Vault. Like the authorizer, it can be updated through governance.

# collectAggregateFees

function collectAggregateFees(address pool) external;

This function collects accumulated aggregate swap and yield fees for the specified pool. It makes a permissioned call on collectAggregateFees in the Vault to calculate the fee amounts, then calls sendTo to transfer the tokens, after which they are distributed to the protocol and pool creator balances. As this affects Vault accounting, it is invoked through unlock and a local "hook", with the ProtocolFeeController acting as the "Router". The Vault function supplies credit for the tokens to be taken as fees, and the fee controller takes debt (through sendTo), ensuring valid settlement.

Parameters:

# getGlobalProtocolSwapFeePercentage

function getGlobalProtocolSwapFeePercentage() external view returns (uint256);

This function returns the current global protocol swap fee percentage. This is the default value used for new pools deployed by standard factories.

# getGlobalProtocolYieldFeePercentage

function getGlobalProtocolYieldFeePercentage() external view returns (uint256);

This function returns the current global protocol yield fee percentage. This is the default value used for new pools deployed by standard factories.

# getPoolProtocolSwapFeeInfo

function getPoolProtocolSwapFeeInfo(address pool) external view returns (uint256, bool);

This function returns the current protocol swap fee for a given pool and a boolean indicating whether the protocol fee has been overridden by governance. Only pools whose protocol fees have NOT been overridden can be permissionlessly updated using updateProtocolSwapFeePercentage.

Parameters:

# getPoolProtocolYieldFeeInfo

function getPoolProtocolYieldFeeInfo(address pool) external view returns (uint256, bool);

This function returns the current protocol yield fee for a given pool and a boolean indicating if the protocol fee has been overridden by governance. Only pools whose protocol fees have NOT been overridden can be permissionlessly updated using updateProtocolYieldFeePercentage.

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# getProtocolFeeAmounts

function getProtocolFeeAmounts(address pool) external view returns (uint256[] memory feeAmounts);

This function returns the amount of each pool token allocated to the protocol and available for withdrawal. It includes both swap and yield fees. Calling collectAggregateFees will transfer any pending fees from the Vault to the Protocol Fee Controller, and allocate them to the protocol and pool creator.

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# getPoolCreatorFeeAmounts

function getPoolCreatorFeeAmounts(address pool) external view returns (uint256[] memory feeAmounts);

This function returns the amount of each pool token allocated to the pool creator and available for withdrawal. It includes both swap and yield fees. Calling collectAggregateFees on the Vault will transfer any pending fees from the Vault to the Protocol Fee Controller, and allocate them to the protocol and pool creator.

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# computeAggregateFeePercentage

function computeAggregateFeePercentage(
    uint256 protocolFeePercentage,
    uint256 poolCreatorFeePercentage
) external pure returns (uint256 aggregateFeePercentage);

This function returns a calculated aggregate percentage from protocol and pool creator fee percentages. It's not tied to any particular pool; this just performs the low-level "additive fee" calculation. Note that this respects the Vault's 24-bit aggregate fee precision limit. If you try to set a fee such that the aggregate requires greater than 24-bit precision, this will revert.

Parameters:

# updateProtocolSwapFeePercentage

function updateProtocolSwapFeePercentage(address pool) external;

This function overrides the protocol swap fee percentage for a specific pool. This is a permissionless call, and will set the pool's fee to the current global fee, if it is different from the current value, and the fee is not controlled by governance (i.e., has never been overridden).

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# updateProtocolYieldFeePercentage

function updateProtocolYieldFeePercentage(address pool) external;

This function overrides the protocol yield fee percentage for a specific pool. This is a permissionless call, and will set the pool's fee to the current global fee, if it is different from the current value, and the fee is not controlled by governance (i.e., has never been overridden).

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# registerPool

function registerPool(
    address pool,
    address poolCreator,
    bool protocolFeeExempt
) external returns (uint256 aggregateSwapFeePercentage, uint256 aggregateYieldFeePercentage);

This function adds pool-specific entries for protocol swap and yield percentages. This must be called from the Vault during pool registration. It will initialize the pool to the global protocol fee percentage values (or 0, if the protocolFeeExempt flag is set), and return the initial aggregate fee percentages, based on an initial pool creator fee of 0. The idea here is to allow protocols to "test" new pool types with zero fees. Governance can always override the protocol fee percentages: the exemption only sets the starting value, and does not mean the pool creator controls the protocol fee. (The pool creator does exclusively control pool creator fees.)

Parameters:

# setGlobalProtocolSwapFeePercentage

function setGlobalProtocolSwapFeePercentage(uint256 newProtocolSwapFeePercentage) external;

This function sets the global protocol swap fee percentage, used by standard pools. This is a permissioned call.

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# setGlobalProtocolYieldFeePercentage

function setGlobalProtocolYieldFeePercentage(uint256 newProtocolYieldFeePercentage) external;

This function sets the global protocol yield fee percentage, used by standard pools. This is a permissioned call.

Parameters:

# setProtocolSwapFeePercentage

function setProtocolSwapFeePercentage(address pool, uint256 newProtocolSwapFeePercentage) external;

This function overrides the protocol swap fee percentage for a specific pool. This is a permissioned call.

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# setProtocolYieldFeePercentage

function setProtocolYieldFeePercentage(address pool, uint256 newProtocolYieldFeePercentage) external;

This function overrides the protocol yield fee percentage for a specific pool. This is a permissioned call.

Parameters:

# setPoolCreatorSwapFeePercentage

function setPoolCreatorSwapFeePercentage(address pool, uint256 poolCreatorSwapFeePercentage) external;

This function assigns a new pool creator swap fee percentage to the specified pool. This is a permissioned call; the caller must be the pool creator.

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# setPoolCreatorYieldFeePercentage

function setPoolCreatorYieldFeePercentage(address pool, uint256 poolCreatorYieldFeePercentage) external;

This function assigns a new pool creator yield fee percentage to the specified pool. This is a permissioned call; the caller must be the pool creator.

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# withdrawProtocolFees

function withdrawProtocolFees(address pool, address recipient) external;

This function withdraws collected protocol fees for a given pool. It sends swap and yield protocol fees to the recipient. This is a permissioned call.

Parameters:

# withdrawProtocolFeesForToken

function withdrawProtocolFeesForToken(address pool, address recipient, IERC20 token) external;

This function withdraws collected protocol fees for a given pool and token. It sends swap and yield protocol fees to the recipient. This is a permissioned call, intended to cover the rare case when one of the tokens cannot be withdrawn (e.g., it is bricked or blocked).

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# withdrawPoolCreatorFees

function withdrawPoolCreatorFees(address pool, address recipient) external;

This function withdraws collected pool creator fees for a given pool. It sends swap and yield pool creator fees to the recipient. This is a permissioned call; the caller must be the pool creator.

Parameters:

# withdrawPoolCreatorFees

function withdrawPoolCreatorFees(address pool) external;

This function withdraws collected pool creator fees for a given pool. It sends swap and yield pool creator fees to the registered pool creator. Since there is no recipient, this is a permissionless call, allowing easier automation of fee collection.

Parameters: