Interactive Tool

Fee Simulator

Mirrors the exact Solidity sigmoid calculation on-chain.

Live calculation
Parameters
Price delta (Δp)0.50%
Base fee500 hbps (0.0500%)
Trade size$10,000
Swap direction
This swap is in the arbitrage direction. The sigmoid hook applies a higher fee to protect LPs.
Results
Sigmoid Δ%
4.74%
Applied Fee
524 hbps
0.0524%
Multiplier
1.047×
Fee on Trade
$5.2400
vs $5.0000 base (+4.8%)
Sigmoid curve · fee(Δp)
─ Sigmoid output- - base fee (0.5)- - 2× cap● Your Δp
Fee multiplier by delta · USDC→WETH (arb if Δp > 0)