Contract Interface

The Evix smart contract exposes a minimal interface for on-chain swap execution.

IEvix

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;

interface IEvix {
    /// @notice Executes a swap through the Evix execution layer.
    /// @param tokenIn The input token address.
    /// @param tokenOut The output token address.
    /// @param amountIn The exact amount of tokenIn to swap.
    /// @param deadline Unix timestamp after which the transaction must revert.
    /// @param minAmountOut Minimum acceptable output amount.
    /// @param recipient Address that receives the output tokens.
    /// @return amountOut The final output amount delivered to the recipient.
    function swap(
        address tokenIn,
        address tokenOut,
        uint256 amountIn,
        uint256 deadline,
        uint256 minAmountOut,
        address recipient
    ) external payable returns (uint256 amountOut);
}

Parameters

Parameter	Type	Description
tokenIn	address	The ERC-20 token being sold
tokenOut	address	The ERC-20 token being bought
amountIn	uint256	Exact amount of tokenIn to swap (must be > 0)
deadline	uint256	Unix timestamp — transaction reverts if block.timestamp > deadline
minAmountOut	uint256	Minimum acceptable output — reverts if actual output is lower
recipient	address	Receives the output tokens (must not be address(0))

Return Value

Name	Type	Description
amountOut	uint256	The actual amount of tokenOut delivered to recipient

Events

Swap

Emitted on every successful swap execution.

event Swap(
    address indexed sender,
    address indexed tokenIn,
    address indexed tokenOut,
    uint256 amountIn,
    uint256 amountOut,
    address recipient
);

Field	Indexed	Description
sender	Yes	msg.sender — the address that initiated the swap
tokenIn	Yes	Input token address
tokenOut	Yes	Output token address
amountIn	No	Input amount
amountOut	No	Actual output amount
recipient	No	Address that received the output tokens

Errors

Error	Signature	When
Deadline exceeded	DeadlineExceeded()	block.timestamp > deadline
Insufficient output	InsufficientOutput(uint256 amountOut, uint256 minAmountOut)	Actual output < minAmountOut
Invalid input	InvalidAmountIn()	amountIn == 0
Invalid recipient	InvalidRecipient()	recipient == address(0)
Unsupported pair	UnsupportedPair(address tokenIn, address tokenOut)	Pair not allowlisted

ABI

The full ABI is available in the TypeScript SDK as evixAbi:

import { evixAbi } from "@inductiv/evix-sdk";

Raw ABI JSON

[
  {
    "type": "function",
    "name": "swap",
    "inputs": [
      { "name": "tokenIn", "type": "address" },
      { "name": "tokenOut", "type": "address" },
      { "name": "amountIn", "type": "uint256" },
      { "name": "deadline", "type": "uint256" },
      { "name": "minAmountOut", "type": "uint256" },
      { "name": "recipient", "type": "address" }
    ],
    "outputs": [{ "name": "amountOut", "type": "uint256" }],
    "stateMutability": "payable"
  },
  {
    "type": "event",
    "name": "Swap",
    "inputs": [
      { "name": "sender", "type": "address", "indexed": true },
      { "name": "tokenIn", "type": "address", "indexed": true },
      { "name": "tokenOut", "type": "address", "indexed": true },
      { "name": "amountIn", "type": "uint256", "indexed": false },
      { "name": "amountOut", "type": "uint256", "indexed": false },
      { "name": "recipient", "type": "address", "indexed": false }
    ]
  },
  {
    "type": "error",
    "name": "DeadlineExceeded",
    "inputs": []
  },
  {
    "type": "error",
    "name": "InsufficientOutput",
    "inputs": [
      { "name": "amountOut", "type": "uint256" },
      { "name": "minAmountOut", "type": "uint256" }
    ]
  },
  {
    "type": "error",
    "name": "InvalidAmountIn",
    "inputs": []
  },
  {
    "type": "error",
    "name": "InvalidRecipient",
    "inputs": []
  },
  {
    "type": "error",
    "name": "UnsupportedPair",
    "inputs": [
      { "name": "tokenIn", "type": "address" },
      { "name": "tokenOut", "type": "address" }
    ]
  }
]

Owner Functions

These functions are restricted to the deployment owner and are not part of the integrator-facing interface.

setPairSupport

function setPairSupport(
    address tokenA,
    address tokenB,
    bool supported
) external onlyOwner;

Enables or disables a token pair on the deployment. Pair order does not matter — (A, B) and (B, A) resolve to the same pair key via ordered hashing.