Root + Impact

Description

• Normal Behavior:
  The contract calculates fees for ReFi swaps using:

• Observed Issue:
  For very small swap amounts, integer division causes precision loss, rounding the fee down to zero:

  • swapAmount = 1, sellFee = 3000 → feeAmount = 0

  • swapAmount = 33, sellFee = 3000 → feeAmount = 0

  • swapAmount = 34, sellFee = 3000 → feeAmount = 1

Risk

Likelihood:

• Only occurs on very small swaps (<34 wei for a 3% fee).

Real-world swaps are typically much larger.

Impact:

• Fees may appear as zero for tiny swaps.

No actual protocol loss because Uniswap V4 handles fee collection internally.

• Could slightly affect event reporting or analytics.

Proof of Concept

Recommended Mitigation