Simple ERC20 Crowdsale contract

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1

I need a very simple crowdsale contract. The user sends ETH and gets tokens in return during a timeframe. No caps, no minting, no refunds. Are there any available templates for this?

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2

There is an earlier version for crowdsale, you can have a check: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/d1158ea68c597075a5aec4a77a9c16f061beffd3/contracts/crowdsale/Crowdsale.sol

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3

Hi @relapse42,

Welcome to the community :wave:

There is a simple example in the forum: Help me write an erc20 token and a crowdsale contract

Crowdsales are in OpenZeppelin Contracts 2.x (they were removed in 3.x). The documentation is here: https://docs.openzeppelin.com/contracts/2.x/crowdsales

If you are creating a token, I suggest looking at: Points to consider when creating a fungible token (ERC20, ERC777)

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4

Great. Thanks! I already have the token created.

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5

Remix unable to import. Files not found.

import "../GSN/Context.sol";
import "../token/ERC20/IERC20.sol";
import "../math/SafeMath.sol";
import "../token/ERC20/SafeERC20.sol";
import "../utils/ReentrancyGuard.sol";
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6

Hi @relapse42,

With Remix you can use GitHub rather than npm imports.

So you can import from an official release of OpenZeppelin Contracts, e.g. 2.5.1.

pragma solidity ^0.5.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.5.1/contracts/crowdsale/Crowdsale.sol";

/**
 * @title SimpleCrowdsale
 * @dev This is an example of a fully fledged crowdsale.
 */
contract SimpleCrowdsale is Crowdsale {
    constructor (
        uint256 rate,
        address payable wallet,
        IERC20 token
    )
        public
        Crowdsale(rate, wallet, token)
    {
    }
}