Chainlink
This page explains how to get the latest price of ONE and other HRC20 assets inside smart contracts, using the Chainlink Price Feed on Harmony.
AAVE-USD: 0x6EE1EfCCe688D5B79CB8a400870AF471c5282992
BTC-USD: 0x3C41439Eb1bF3BA3b2C3f8C921088b267f8d11f4
ETH-USD: 0xbaf7C8149D586055ed02c286367A41E0aDA96b7C
LINK-USD: 0xD54F119D10901b4509610eA259A63169647800C4
ONE-USD: 0xdCD81FbbD6c4572A69a534D8b8152c562dA8AbEF
USDC-USD: 0xA45A41be2D8419B60A6CE2Bc393A0B086b8B3bda
USDT-USD: 0x5CaAeBE5C69a8287bffB9d00b5231bf7254145bf
UST-USD: 0xEF9ab2298715631dE7E8F17482ce63A108158819
DAI-USD: 0x1FA508EB3Ac431f3a9e3958f2623358e07D50fe0
ETH-USD: 0x4f11696cE92D78165E1F8A9a4192444087a45b64
DSLA-USD: 0x5f0423B1a6935dc5596e7A24d98532b67A0AeFd8
USDC-USD: 0x6F2bD4158F771E120d3692C45Eb482C16f067dec
SUSHI-USD: 0x90142a6930ecF80F1d14943224C56CFe0CD0d347
USDT-USD: 0x9A37E1abFC430B9f5E204CA9294809c1AF37F697
WBTC-USD: 0xEF637736B220a58C661bfF4b71e03ca898DCC0Bd
BUSD-USD: 0xa0ABAcC3162430b67Aa6C135dfAA08E117A38bF0
ONE-USD: 0xcEe686F89bc0dABAd95AEAAC980aE1d97A075FAD
LINK-USD: 0xcd11Ac8C18f3423c7a9C9d5784B580079A75E69a
To consume price data, your smart contract should reference
AggregatorV3Interface, which defines the external functions implemented by Price Feeds.pragma solidity ^0.6.7;
import "@chainlink/contracts/src/v0.6/interfaces/AggregatorV3Interface.sol";
contract PriceConsumerV3 {
AggregatorV3Interface internal priceFeed;
/**
* Network: Harmony testnet
* Aggregator: ONE/USD
* Address: 0xcEe686F89bc0dABAd95AEAAC980aE1d97A075FAD
*/
constructor() public {
priceFeed = AggregatorV3Interface(0xcEe686F89bc0dABAd95AEAAC980aE1d97A075FAD);
}
/**
* Returns the latest price
*/
function getThePrice() public view returns (int) {
(
uint80 roundID,
int price,
uint startedAt,
uint timeStamp,
uint80 answeredInRound
) = priceFeed.latestRoundData();
return price;
}
}
The
latestRoundData function returns five values representing information about the latest price data. See Price Feeds API Reference for more details.const web3 = new Web3("https://api.s0.b.hmny.io");
const aggregatorV3InterfaceABI = [{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"description","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"_roundId","type":"uint80"}],"name":"getRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}];
const addr = "0xcEe686F89bc0dABAd95AEAAC980aE1d97A075FAD";
const priceFeed = new web3.eth.Contract(aggregatorV3InterfaceABI, addr);
priceFeed.methods.latestRoundData().call()
.then((roundData) => {
// Do something with roundData
console.log("Latest Round Data", roundData)
});
Sample output when you run the above code:
Latest Round Data Result {
'0': '18446744073709552763',
'1': '11429419',
'2': '1629106535',
'3': '1629106535',
'4': '18446744073709552763',
roundId: '18446744073709552763',
answer: '11429419',
startedAt: '1629106535',
updatedAt: '1629106535',
answeredInRound: '18446744073709552763'
}
from web3 import Web3
web3 = Web3(Web3.HTTPProvider('https://api.s0.b.hmny.io'))
abi = '[{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"description","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"_roundId","type":"uint80"}],"name":"getRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]'
addr = '0xcEe686F89bc0dABAd95AEAAC980aE1d97A075FAD'
contract = web3.eth.contract(address=addr, abi=abi)
latestData = contract.functions.latestRoundData().call()
print(latestData)
Last modified 1yr ago