# ERC-1363 Payable Token

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ERC-1363 allows to implement an ERC-20 token that can be used for payments.

This is an implementation of the ERC-1363 Payable Token (opens new window) that defines a token interface for ERC-20 tokens that supports executing recipient code after transfer or transferFrom, or spender code after approve.

# Abstract

There is no way to execute code after an ERC-20 transfer or approval (i.e. making a payment), so to make an action it is required to send another transaction and pay GAS twice. ERC-1363 makes token payments easier and working without the use of any other listener. It allows to make a callback after a transfer or approval in a single transaction.

There are many proposed uses of Ethereum smart contracts that can accept ERC-20 payments.

Examples could be:

  • to create a token payable crowdsale
  • selling services for tokens
  • paying invoices
  • making subscriptions

For these reasons it was named as "Payable Token".

Anyway you can use it for specific utilities or for any other purposes who require the execution of a callback after a transfer or approval received.

# Install

npm install erc-payable-token

# Usage

pragma solidity ^0.7.0;

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

contract MyToken is ERC1363 {

  constructor (string memory name, string memory symbol) ERC1363(name, symbol) {}

  // your stuff
}

# Code

This repo contains:

# IERC1363

IERC1363.sol (opens new window)

Interface for a Payable Token contract as defined in ERC-1363 Payable Token (opens new window).

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

# ERC1363

ERC1363.sol (opens new window)

Implementation of an IERC1363 interface.

# IERC1363Receiver

IERC1363Receiver.sol (opens new window)

Interface for any contract that wants to support transferAndCall or transferFromAndCall from ERC1363 token contracts.

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

# IERC1363Spender

IERC1363Spender.sol (opens new window)

Interface for any contract that wants to support approveAndCall from ERC1363 token contracts.

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

# ERC1363Payable

ERC1363Payable.sol (opens new window)

Implementation proposal of a contract that wants to accept ERC1363 payments. It intercepts what is the ERC1363 token desired for payments and throws if another is sent.

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

It also implements a transferReceived function that can be overridden to make your stuffs 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 can be overridden to make your stuffs within your contract after a onApprovalReceived.

# ERC1363PayableCrowdsale

ERC1363PayableCrowdsale.sol (opens new window)

As example: an Implementation of a classic token Crowdsale, but paid with ERC1363 tokens instead of ETH.

# Development

# Install dependencies

npm install

# Linter

Use Solhint

npm run lint:sol

Use ESLint

npm run lint:js

Use Eslint and fix

npm run lint:fix

# Usage (using Truffle)

Open the Truffle console

npm run truffle:console

# Compile

npm run truffle:compile

# Test

npm run truffle:test

# Usage (using Hardhat)

Open the Hardhat console

npm run hardhat:console

# Compile

npm run hardhat:compile

# Test

npm run hardhat:test

# Code Coverage

npm run hardhat:coverage

# License

Code released under the MIT License (opens new window).