ERC-1363 Payable Token

ERC-1363 is an extension interface for ERC-20 tokens that supports executing code on a recipient contract after transfer or transferFrom, or code on a spender contract after approve, in a single transaction.

There is no way to execute code on a receiver/spender contract after ERC-20 transfers or approvals so, to perform an action, it is required to send another transaction. This introduces complexity in UI development and friction on adoption as users must wait for the first transaction to be executed and then submit the second one. They must also pay GAS twice.

ERC-1363 makes tokens capable of performing actions more easily and working without the use of any off-chain listener. It allows to make a callback on receiver/spender contracts, after transfers or approvals, in a single transaction.

The following are functions and callbacks introduced by ERC-1363:

• transferAndCall and transferFromAndCall will call an onTransferReceived on a ERC1363Receiver contract.
• approveAndCall will call an onApprovalReceived on a ERC1363Spender contract.

ERC-1363 tokens can be used for specific utilities in all cases that require a callback to be executed after a transfer or an approval received. ERC-1363 is also useful for avoiding token loss or token locking in contracts by verifying the recipient contract's ability to handle tokens.

[!IMPORTANT] This repo contains the reference implementation of the official ERC-1363.

Install

npm install erc-payable-token

Usage

pragma solidity ^0.8.20;

import "erc-payable-token/contracts/token/ERC1363/ERC1363.sol";

contract MyToken is ERC1363 {
    constructor(string memory name, string memory symbol) ERC20(name, symbol) {
        // your stuff
    }

  // your stuff
}

Code

IERC1363

IERC1363.sol

Interface of the ERC-1363 standard as defined in the ERC-1363.

interface IERC1363 is IERC20, IERC165 {
    function transferAndCall(address to, uint256 value) external returns (bool);
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);
    function approveAndCall(address spender, uint256 value) external returns (bool);
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}

IERC1363Receiver

IERC1363Receiver.sol

Interface for any contract that wants to support transferAndCall or transferFromAndCall from ERC-1363 token contracts.

interface IERC1363Receiver {
    function onTransferReceived(address spender, address sender, uint256 amount, bytes calldata data) external returns (bytes4);
}

IERC1363Spender

IERC1363Spender.sol

Interface for any contract that wants to support approveAndCall from ERC-1363 token contracts.

interface IERC1363Spender {
    function onApprovalReceived(address sender, uint256 amount, bytes calldata data) external returns (bytes4);
}

ERC1363Utils

ERC1363Utils.sol

Library that provides common ERC-1363 utility functions and custom errors.

ERC1363

ERC1363.sol

Implementation of the ERC-1363 interface.

The reference implementation of ERC-1363 that extends ERC-20 and adds support for executing code after transfers and approvals on recipient contracts.

[!IMPORTANT] transferAndCall, transferFromAndCall and approveAndCall revert if the recipient/spender is an EOA (Externally Owned Account).

To transfer tokens to an EOA or approve it to spend tokens, use the ERC-20 transfer, transferFrom or approve methods.

Extensions

ERC1363Mintable

ERC1363Mintable.sol

An extension of ERC-1363 that adds a _mintAndCall method.

This method allows to mint new tokens to a receiver contract and then call the onTransferReceived callback.

[!NOTE] _mintAndCall is an internal method, and you should call it from your derived contract.

For instance, you may choose to check if the receiver is a contract or an EOA and call the _mint method instead.

pragma solidity ^0.8.20;

// other imports
import "erc-payable-token/contracts/token/ERC1363/extensions/ERC1363Mintable.sol";

contract MyToken is ERC1363Mintable, Ownable {
    // your stuff

    function safeMint(address account, uint256 value, bytes memory data) public onlyOwner {
        if (account.code.length == 0) {
            _mint(account, value);
        } else {
            _mintAndCall(account, value, data);
        }
    }

    // your stuff
}

Presets

[!WARNING] The presets contracts are ideas and suggestions for using ERC-1363 tokens within your contracts.

When inheriting or copying from these contracts, you must include a way to use the received tokens, otherwise they will be stuck into the contract.

Always test your contracts before going live.

ERC1363Guardian

ERC1363Guardian.sol

A contract that allows to accept ERC-1363 callbacks after transfers or approvals.

It emits a TokensReceived event to notify the transfer received by the contract.

It also implements a _transferReceived function that must be overridden to make your stuff within your contract after a onTransferReceived.

It emits a TokensApproved event to notify the approval received by the contract.

It also implements a _approvalReceived function that must be overridden to make your stuff within your contract after a onApprovalReceived.

[!TIP] After an approveAndCall your contract should use the allowance to do something.

For instance, you may choose to transfer the approved amount of tokens into the contract itself and then update internal status.

function _approvalReceived(
    address token,
    address owner,
    uint256 value,
    bytes calldata data
) internal override {
    IERC20(token).transferFrom(owner, address(this), value);

    // update internal status
}

You must then include a way to use the received tokens, otherwise they will be stuck into the contract.

Examples

[!CAUTION] The examples contracts are for testing purpose only. Do not use in production.

When copying from these contracts, you must include a way to use the received tokens, otherwise they will be stuck into the contract.

Always test your contracts before going live.

ERC1363Payable

ERC1363Payable.sol

An example contract that allows to test accepting ERC-1363 deposits via transferAndCall, transferFromAndCall and approveAndCall.

Inherits from ERC1363Guardian but requires a IERC1363 address to set as accepted token.

Deposits done using not accepted tokens will revert.

Once a deposit is confirmed, the contract increases the user credit value.

ERC1363MethodCallReceiver

ERC1363MethodCallReceiver.sol

An example contract that allows to test passing methods via abi encoded function call.

It executes the method passed via data. Methods emit a MethodCall event.

Documentation

• Solidity API

Code Analysis

• Control Flow
  • ERC1363
  • ERC1363Mintable
• Description Table
  • ERC1363
  • ERC1363Mintable
• Inheritance Tree
  • ERC1363
  • ERC1363Mintable
• UML
  • ERC1363
  • ERC1363Mintable

Development

Install dependencies

npm install

Compile

npm run compile

Test

npm test

Code Coverage

npm run coverage

Linter

Check Solidity files

npm run lint:sol

Check JS/TS files

npm run lint:js

Fix JS and Solidity files

npm run lint:fix

License

Code released under the MIT License.