Price Impact, Fee & Slippage Display

[0x-r4bbit]

Below the swap fields, display a summary row showing the calculated fee, price impact, slippage tolerance input, and the resulting min-received / max-sent guarantee.

Calculations

Fee (deducted from input before the swap):

fee_amount = swap_amount_in × fees / 10_000

Price impact (how much the trade moves the pool price):

price_before = reserve_a / reserve_b
price_after  = (reserve_a + amount_in) / (reserve_b − amount_out)
price_impact = (price_after − price_before) / price_before × 100

Min received (exact-input mode, applying user slippage tolerance s in %):

min_received = amount_out × (1 − s / 100)

Max sent (exact-output mode):

max_sent = amount_in × (1 + s / 100)

Requirements

• Slippage tolerance input defaulting to 0.5%, with preset buttons for 0.1%, 0.5%, 1.0%
• Fee shown in input token units (e.g. 0.30 USDC)
• Price impact shown as a percentage; highlight amber when > 1%, red when > 5%
• Min received / max sent updates in real time as amounts or slippage changes

Acceptance criteria

• Fee amount is correct for both swap directions
• Price impact matches the constant-product formula
• Slippage presets and custom input both update min received / max sent
• Color thresholds apply correctly (neutral / amber / red)
• All values update on amount change, direction flip, and slippage change