Created
February 10, 2021 15:55
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Use Chainlink to convert US Dollars to ETH
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| pragma solidity ^0.8.0; | |
| // SPDX-License-Identifier: MIT | |
| import "https://github.com/smartcontractkit/chainlink/evm-contracts/src/v0.7/interfaces/AggregatorV3Interface.sol"; | |
| contract PriceConsumerV3 { | |
| AggregatorV3Interface internal priceFeed; | |
| /** | |
| * Network: Rinkeby | |
| * Aggregator: ETH/USD | |
| * Address: 0x8A753747A1Fa494EC906cE90E9f37563A8AF630e | |
| */ | |
| constructor() public { | |
| priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e); | |
| } | |
| //convert amount and denominator to wei values with multipliers | |
| //multipliers are needed for accurate division | |
| function ethUSD(uint _amount) public view returns (uint) { | |
| uint denominator = uint(getLatestPrice()); | |
| uint256 ethInUsdAmount = _amount * 1000000000000000000000/denominator * 100000; | |
| return ethInUsdAmount; | |
| } | |
| /** | |
| * Returns the latest price of ETH/USD from Chain.link | |
| */ | |
| function getLatestPrice() public view returns (int) { | |
| ( | |
| uint80 roundID, | |
| int price, | |
| uint startedAt, | |
| uint timeStamp, | |
| uint80 answeredInRound | |
| ) = priceFeed.latestRoundData(); | |
| return price; | |
| } | |
| } |
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constructor(address _priceFeed) public { priceFeed = AggregatorV3Interface(_priceFeed); }Use any of these priceFeed addresses https://docs.chain.link/docs/ethereum-addresses for different pairs