$ npm install -E openzeppelin-solidity

Build ERC20 Smart contract using openzeppelin library in Token.sol file.

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we can receive ether and mint new tokens for the ether sender. we will pass rate, addres and token in constructor. _token: The ERC20 token that is to be minted and sent to the investors _wallet: The wallet address where the ether will be forwarded _rate: The rate at which the tokens should be minted

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When anyone purchased the token we will mint the token. For that we will inherit MintedCrowdsale contract from openzeppelin.

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Installation

$ yarn add @chainlink/contracts

$ npm install @chainlink/contracts --save

import "@chainlink/contracts/src/v0.6/interfaces/AggregatorV3Interface.sol";

Chainlink oracle is used to convert ETH to USD. This smart contract reference AggregatorV3Interface, which defines the external functions implemented by Price Feeds.

 * Network: Kovan
 * Aggregator: ETH/USD
 * Address: 0x9326BFA02ADD2366b30bacB125260Af641031331

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