Swapping

Shielded swaps execute Uniswap V2 token swaps within the privacy pool. Your trading activity is hidden from on-chain observers.

Steps

1. Navigate to the Swap screen

2. Select the input token (From)

3. Select the output token (To)

4. The app checks if a valid Uniswap pair exists

5. Enter the input amount

6. The app fetches a quote showing the expected output

7. Optionally adjust slippage and deadline settings

8. Confirm the swap transaction in your wallet

What Happens

1. The wallet signs a Uniswap V2 swap transaction

2. The proxy intercepts and generates a ZK proof

3. The contract verifies the proof

4. The contract executes the actual swap on Uniswap V2

5. The swap output is captured as a new note in the Merkle tree

Swap Types

From	To	Uniswap Function
ETH	ERC-20	swapExactETHForTokens
ERC-20	ETH	swapExactTokensForETH
ERC-20	ERC-20	swapExactTokensForTokens

Output Notes

Each swap creates 3 notes:

Note	Contains
Swap output note	The tokens received from the swap
Change note	Leftover input token balance
Fee change note	Leftover fee-asset balance

Fee Handling

• If the fee token matches the swap input token, fees are deducted from the input pool

• If they differ (e.g., paying ETH fees for an ERC-20→ERC-20 swap), separate fee notes are required

ERC-20 → ERC-20 Swaps

These generate 3 transaction entries in history:

1. One outgoing ERC-20 (input)

2. One incoming ERC-20 (output)

3. One outgoing ETH (fee)

Slippage and Deadline

• Slippage: Minimum acceptable output (set via amountOutMin)

• Deadline: Maximum block timestamp for the swap to execute

Both are enforced by the Uniswap V2 router on-chain.