Nerif Docs

Price Feed Tutorial

In this guide, we will explore the process of leveraging Nerif Network to automate a price feed.
The idea is to leverage smart contract functions and the capabilities of the Nerif Network to automate the process of monitoring and updating the ETH/USDT pair price in real-time, ensuring accurate and timely information within the smart contract.
Thus, our primary goal is to build a workflow that will be checking the price of the ETH/USDT pair and update its value within a smart contract accordingly.
To ensure a seamless flow of checking the price and updating its value within a smart contract, Nerif Network will be calling 2 functions from the below Price Feed smart contract:
  1. 1.
    function priceChanged checking if the price of the ETH/USDT pair has changed
  2. 2.
    function updatePrice to update the price of the ETH/USDT pair.
contract PriceFeed {
uint256 public price;
event PriceChanged(uint256 newPrice);
function priceChanged(uint256 _price) external view returns (bool changed) {
return price != _price;
function updatePrice(uint256 _price) external {
price = _price;
emit PriceChanged(_price);