F-2025-0014·design-flaw

Immutable platform fee configuration leads to inflexible fee structure and forced upgrades

Fixednfterc721erc20
TL;DR

Platform fee can only be set at initialization and cannot be updated, forcing costly upgrades for any future fee adjustment.

Severity
LOW
Impact
LOW
Likelihood
MEDIUM
Method
MManual review
CAT.
Complexity
LOW
Exploitability
LOW
02Section · Description

Description

The platform fee percentage can only be set once during contract initialization and cannot be updated afterward. The contract lacks any administrative function to modify the platformFeePercent value after deployment, making the fee structure permanently fixed.

solidity
function initialize(address payable _treasury, uint32 _fee) public initializer {
if (_treasury == address(0)) revert ZeroAddress();
if (_fee > 10000) revert InvalidFee();
platformTreasury = _treasury;
platformFeePercent = _fee; // Set once during initialization, no update mechanism
}

This creates several operational challenges:

  • Market adaptation: Unable to adjust fees based on changing market conditions or user feedback.
  • Competitive response: Cannot respond to competitor pricing strategies or industry standards.
  • Revenue optimization: No ability to experiment with different fee structures to optimize platform revenue.

The immutable fee structure may force the platform to choose suboptimal initial fees due to uncertainty about future market conditions, or alternatively require costly contract upgrades solely for fee adjustments.

03Section · Impact

Impact

Operational rigidity; future fee changes require a full upgrade cycle even though fees are operational parameters.

04Section · Recommendation

Recommendation

Implement an administrative function to update platform fees with appropriate access controls and safety measures:

solidity
event PlatformFeeUpdated(uint32 oldFee, uint32 newFee);
function updatePlatformFee(uint32 _newFee) external onlyOwner {
if (_newFee > 10000) revert InvalidFee();
uint32 oldFee = platformFeePercent;
platformFeePercent = _newFee;
emit PlatformFeeUpdated(oldFee, _newFee);
}
05Section · Resolution

Resolution

Ipal Network: Confirmed. We agreed with the recommendation.

Zealynx: Not Fixed: The platform fee percentage can only be set once during contract initialization and cannot be updated afterward.

UPDATE: Fixed.

Status
Fixed
F-2025-0014

oog
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