FeeFacet API Reference

The FeeFacet handles progressive fee calculation, fee configuration, and protocol fee collection.

Functions

Calculate the progressive fee for a given trade size.

solidity

function calculateFee(bytes32 poolId, uint256 tradeSize) external view returns (uint256 feeBps)

Parameters:

Name	Type	Description
poolId	bytes32	The pool identifier
tradeSize	uint256	Absolute trade size in token units

Returns: uint256 feeBps - total fee in basis points

Update fee configuration for a pool (owner only).

solidity

function setFeeConfig(bytes32 poolId, FeeConfig calldata config) external

Parameters (FeeConfig):

Name	Type	Description
baseFee	uint256	Base fee in basis points
maxImpactFee	uint256	Maximum impact fee in basis points
lpShareBps	uint256	LP share (default: 7000 = 70%)
protocolShareBps	uint256	Protocol share (default: 2000 = 20%)
traderShareBps	uint256	Trader rebate pool (default: 1000 = 10%)

Shares must sum to 10000 (100%).

Collect accumulated protocol fees.

solidity

function collectProtocolFees(bytes32 poolId, address recipient) 
    external returns (uint256 amount0, uint256 amount1)

Get current fee configuration for a pool.

solidity

function getFeeConfig(bytes32 poolId) external view returns (FeeConfig memory)

Licensed under the GNU General Public License v3.0--see LICENSE for terms.

Copyright (C) 2026 PaxLabs Inc.
SPDX-License-Identifier: GPL-3.0-only