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The protocol includes a flexible fee structure that developers can leverage when creating off-ramp orders. Fees are a crucial part of the transaction process, and this implementation ensures that they are handled transparently and flexibly.

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Fee Parameters in Trade Creation

The following code snippet illustrates how fee parameters are supplied during the creation of off-ramp orders in the EscrowOfframp contract: 

// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.25;

contract EscrowOfframp {

    struct ClientArgs {
        address client;
    }

    /// @notice This will lock `_amount` in escrow
    /// @param _amount coin amount to off ramp
    /// @param _tradeFee Onboard trade fee
    function createOfframpOrder(uint256 _amount, uint256 _tradeFee ) external {
        // Create off-ramp order and keep record of trade fee
        // Lock trade amount in escrow
    }

    /// @notice It is expected that order amount has been pre-approved by customer to escrow account
    /// @param _token ERC20 token address
    /// @param _amount coin amount to off ramp
    function createOfframpOrder(IERC20 _token, uint256 _amount, uint256 _tradeFee ) external {
        // Verify if amount is approved by user to be locked in escrow
        // Keep trade record including the fee to be charged
        // Lock trade amount in escrow
    }

    // @notice Mediator confirms order in dispute cases
    function confirmOfframpOrder(ClientArgs memory args) external returns(bool success) {
        // Ensure that order exists for args client
        // Execute transfer of asset to merchant escrow account
        // Transfer trade fee to designated fee recipient address
    }
}
The createOfframpOrder function allows users to lock a specified amount of tokens in escrow. During the creation of the off-ramp order, a _tradeFee parameter is supplied. This fee is recorded and associated with the transaction. There are two versions of this function:
  • One that handles native tokens.
  • One that deals with ERC20 tokens, ensuring the amount is pre-approved for transfer to the escrow account.
During order processing, the confirmOfframpOrder function ensures the existence of the order for the specified client and executes the transfer of assets to the merchant’s escrow account. The _tradeFee is then transferred to a designated fee recipient address, ensuring that fees are collected appropriately.