price-indexer

Developed by: Jay Rank

Introduction

price-indexer is a SDK built to fetch price feed data from Chainlink Oracles over EVM-compatible blockchains as well as from DIA Org over NEAR blockchain.

For installation, refer here or run the following command in your node project.

npm install price-indexer

How to use

1. Fetch Latest Price for ETH-USD from Chainlink Oracles

This function returns the value of 1 Ethreum in terms of USD currency.

• Use this function when you simply want to fetch ETH-USD conversion.

const PriceIndexer = require('price-indexer');

let networkName = 'mainnet'; // Only works on 'mainnet' network over EVM.
let fetchPriceIndex;

async function getLatestPriceFeed() {
	fetchPriceIndex = await new PriceIndexer(networkName).basePrice();
	console.log(fetchPriceIndex);
}


getLatestPriceFeed();

2. Fetch Latest Price for any asset from Chainlink Oracles

This function returns the value of one asset/cryptocurrency in terms of other asset/cryptocurrency (e.g. in FTM-ETH oracle, index of 1 FTM in terms of ETH is returned).

• Use this function when you want to fetch any asset except USD.
• If the base assset is not USD, you can get the price in USD by setting the value tertiary variable false.
  • For example: If the address holds for FTM-ETH, you can get the price in USD instead of ETH by setting the value tertiary variable false.

const PriceIndexer = require('price-indexer');

let networkName = 'mainnet'; // 'mainnet', 'rinkeby', 'ropsten'
let oracleContractAddress = '0x2DE7E4a9488488e0058B95854CC2f7955B35dC9b'; // FTM-ETH oracle contract address
// Visit https://data.chain.link/ to find options for specific token/asset for oracle contract addresses.
let fetchPriceIndex;

async function getLatestPriceFeed() {
	fetchPriceIndex = await new PriceIndexer(networkName, oracleContractAddress, false).assetPrice();
	console.log(fetchPriceIndex);
}


getLatestPriceFeed();

3. Fetch Latest Price for any asset from DIA Org

This function returns the value of one asset/cryptocurrency directly via DIA Data APIs. Read more about these APIs here.

• Use this function when you simply want to fetch latest price from DIA Data APIs.

const PriceIndexer = require('price-indexer');

let assetName = 'FTM' // Visit https://docs.diadata.org to find more options for retriving price index of an asset.
let fetchPriceIndex;

async function getLatestPriceFeed() {
	fetchPriceIndex = await new PriceIndexer(...[null, null, null], assetName).priceDIAData()
	console.log(fetchPriceIndex);
}

getLatestPriceFeed();

4. Fetch Latest Price for any asset from Messari

This function returns the value of one asset/cryptocurrency directly via Messari Data APIs. Read more about these APIs here.

• Use this function when you simply want to fetch latest price from Messari Data APIs.

const PriceIndexer = require('price-indexer');

let assetName = 'FTM' // Visit https://messari.io/api to find more options for retriving price index of an asset.
let fetchPriceIndex;

async function getLatestPriceFeed() {
	fetchPriceIndex = await new PriceIndexer(...[null, null, null], assetName).priceMESSARIData()
	console.log(fetchPriceIndex);
}

getLatestPriceFeed();