📈 Real-Time Volatility & Dynamic Fee Response Chart
Simulates consecutive swap blocks. Watch how large tick jumps immediately spike the dynamic fee, and how the fee gradually decays over idle blocks.
Dynamic Fee (%)
Price Tick
Static Base (0.30%)
Recent Hook Callbacks & State Transitions
0 recorded events
No events recorded yet. Click a shock button above or run live swaps.
💾 Single-Slot Bitpacked Storage Layout
EVM Storage Slot #0Standard Solidity structs take 8 separate 32-byte storage slots (costing 16,800+ gas on first warm read). Our hook packs all 8 parameters into exactly one 32-byte slot, reducing SSTORE/SLOAD footprint to a minimum.
BYTE OFFSET [0 .. 31]
TOTAL: 24 BYTES USED / 32 BYTES
t[3B]
ts[4B]
vol[4B]
base[3B]
min[3B]
max[3B]
sens[2B]
hl[2B]
ENCODED BYTES32 STORAGE VALUE (LIVE BITWISE PACKED)
0x0000000000000000003c006400c3500001f4000bb8000000006700000000000000
| Variable | Type | Bytes | Active Live Value |
|---|---|---|---|
| lastTick | int24 | 3 | 0 |
| lastTimestamp | uint32 | 4 | 1,728,000,000 |
| volatility | uint32 | 4 | 0 |
| baseFee | uint24 | 3 | 3,000 (0.30%) |
| minFee | uint24 | 3 | 500 (0.05%) |
| maxFee | uint24 | 3 | 50,000 (5.00%) |
| feeSensitivity | uint16 | 2 | 100 |
| halfLife | uint16 | 2 | 60 seconds |
📐 EVM Cancun Gas Profiling & Invariant Guarantees
| Hook Callback | Execution Gas | Opcode Cost Drivers | EVM Status |
|---|---|---|---|
| beforeSwap | 871 gas | 1x SLOAD, math decay, clamp | Optimal |
| afterSwap | 25,060 gas | 1x SSTORE, tick displacement | Cancun |
| afterInitialize | 23,784 gas | Init pool slot, base params | Cancun |
| getEstimatedFee | 3,502 gas | Pure view / eth_call | Free Offchain |
🧮
Exponential Half-Life Bit-Shift Decay
vol_decayed = vol_prior >> (elapsed / halfLife);
// Bounded linear interpolation for remainder seconds
uint256 rem = elapsed % halfLife;
vol_decayed = vol_decayed - ((vol_decayed * rem) / (halfLife * 2));
// Bounded linear interpolation for remainder seconds
uint256 rem = elapsed % halfLife;
vol_decayed = vol_decayed - ((vol_decayed * rem) / (halfLife * 2));
Unlike floating-point math, our algorithm executes in pure integer EVM bit shifts (SHR) with bounded remainder interpolation, ensuring zero rounding overflows and zero division-by-zero risks under Foundry fuzz runs.
Foundry Fuzz Invariants Proven
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Monotonic decay over time
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Strict clamp: minFee ≤ fee ≤ maxFee
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Symmetric abs tick displacement
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Reentrancy-immune pool bindings