Struct ClientFeeParams 

pub struct ClientFeeParams { /* private fields */ }

Client fee configuration for the Tycho Router.

When attached to EncodingOptions via EncodingOptions::with_client_fee, the router charges a client fee on the swap output.

Send these params unsigned. The signature covers the quoted swap, so it can only be produced after the quote comes back — compute the hash with ClientFeeParams::eip712_signing_hash and patch the result into the calldata with Quote::with_client_fee_signature.

Implementations

impl ClientFeeParams

pub fn new( bps: u16, receiver: Bytes, max_contribution: BigUint, deadline: u64, ) -> Self

Create client fee params.

pub fn zero(receiver: Bytes, deadline: u64) -> Self

Create zero-fee client fee params that identify receiver as the fee client without charging anything.

The router resolves one fee client per swap from clientFeeReceiver; without client fee params that is the transaction sender. Zero-fee params attach receiver to the swap, so the router fee rates configured for that address apply, while fee_breakdown.client_fee stays 0 and no funds move to receiver. The receiver key must still sign every swap with ClientFeeParams::eip712_signing_hash, and the params expire at deadline.

pub fn eip712_signing_hash( &self, chain_id: u64, router_address: &Bytes, amount_in: &BigUint, token_in: &Bytes, token_out: &Bytes, expected_amount_out: &BigUint, min_amount_out: &BigUint, receiver: &Bytes, swaps_hash: &[u8; 32], ) -> Result<[u8; 32], FyndError>

Compute the EIP-712 signing hash for the client fee params.

Pass the returned hash to the fee receiver’s signer, then patch the 65-byte result into the quote’s calldata with Quote::with_client_fee_signature.

The hash covers all 11 ClientFee fields. The swap-specific inputs (amount_in, token_in, token_out, expected_amount_out, min_amount_out, receiver, swaps_hash) come from the quote requested with unsigned params — see FeeBreakdown and the swap_client_fee example for the flow.

• router_address: 20-byte address of the TychoRouter contract.
• amount_in: exact input amount from the order.
• token_in: 20-byte input token address.
• token_out: 20-byte output token address.
• expected_amount_out: quoted output amount — use Quote::amount_out.
• min_amount_out: minimum output after fees — use FeeBreakdown::min_amount_received.
• receiver: 20-byte address receiving the swap output.
• swaps_hash: keccak256 of the encoded swaps bytes — use FeeBreakdown::swaps_hash.

The type hash, domain (TychoRouter/1), and field order must match TychoRouterV3.CLIENT_FEE_TYPEHASH. The same shape is encoded via sol! in fynd-core/src/encoding/disable_slippage_taking.rs for server-side signing; keep both in sync if the contract type changes.

Trait Implementations

impl Clone for ClientFeeParams

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ClientFeeParams

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.