Lesson 4: Remix Fund Me (Price feeds)

[RenatoSouzaAN]

I'm using the following code provided at https://docs.chain.link/data-feeds/using-data-feeds:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

contract PriceConsumerV3 {
    AggregatorV3Interface internal priceFeed;

    /**
     * Network: Sepolia
     * Aggregator: BTC/USD
     * Address: 0x1b44F3514812d835EB1BDB0acB33d3fA3351Ee43
     */
    constructor() {
        priceFeed = AggregatorV3Interface(
            0x1b44F3514812d835EB1BDB0acB33d3fA3351Ee43
        );
    }

    /**
     * Returns the latest price.
     */
    function getLatestPrice() public view returns (int) {
        // prettier-ignore
        (
            /* uint80 roundID */,
            int price,
            /*uint startedAt*/,
            /*uint timeStamp*/,
            /*uint80 answeredInRound*/
        ) = priceFeed.latestRoundData();
        return price;
    }
}

Everything working great. But I was trying to experiment and changing the price feed from BTC/USD to ETH/USD, I started facing an error.

This is the code with the change:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

contract PriceConsumerV3 {
    AggregatorV3Interface internal priceFeed;

    /**
     * Network: Sepolia
     * Aggregator: ETH/USD
     * Address: 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
     */
    constructor() {
        priceFeed = AggregatorV3Interface(
            0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
        );
    }

    /**
     * Returns the latest price.
     */
    function getLatestPrice() public view returns (int) {
        // prettier-ignore
        (
            /* uint80 roundID */,
            int price,
            /*uint startedAt*/,
            /*uint timeStamp*/,
            /*uint80 answeredInRound*/
        ) = priceFeed.latestRoundData();
        return price;
    }
}

And this is the error I'm getting:

call to PriceConsumerV3.getLatestPrice errored: Returned error: {"jsonrpc":"2.0","error":"execution reverted","id":2499018146548480}

Why is that happening and what can I do to solve it?

[RenatoSouzaAN]

Nevermind, I saw my mistake.

On the https://docs.chain.link/data-feeds/using-data-feeds, instead of getting the address from Sepolia Testnet's table, I got from Ethereum Mainnet table.

So instead of using: "0x5f4ec3df9cbd43714fe2740f5e3616155c5b8419", I should be using: "0x694AA1769357215DE4FAC081bf1f309aDC325306".

Attaching it to the code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

contract PriceConsumerV3 {
    AggregatorV3Interface internal priceFeed;

    /**
     * Network: Sepolia
     * Aggregator: ETH/USD
     * Address: 0x694AA1769357215DE4FAC081bf1f309aDC325306
     */
    constructor() {
        priceFeed = AggregatorV3Interface(
            0x694AA1769357215DE4FAC081bf1f309aDC325306
        );
    }

    /**
     * Returns the latest price.
     */
    function getLatestPrice() public view returns (int) {
        // prettier-ignore
        (
            /* uint80 roundID */,
            int price,
            /*uint startedAt*/,
            /*uint timeStamp*/,
            /*uint80 answeredInRound*/
        ) = priceFeed.latestRoundData();
        return price;
    }
}