> ## Documentation Index
> Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Chainlink Price Feed (Solidity)

> Read token prices from Chainlink price feeds in a Solidity contract.

# Chainlink Price Feed (Solidity)

Read token prices from Chainlink price feeds in a Solidity contract.

Read token prices from Chainlink price feeds in a Solidity contract.

## Explanation

Chainlink price feeds provide on-chain price data updated by a decentralized oracle network. latestRoundData returns the most recent price. The decimals() call tells you the precision — ETH/USD uses 8 decimals, so 2000000000000 = \$20,000.

## Code

```solidity theme={null}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

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

contract PriceConsumer {
    AggregatorV3Interface internal priceFeed;

    // ETH/USD on mainnet
    constructor() {
        priceFeed = AggregatorV3Interface(0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419);
    }

    function getLatestPrice() external view returns (int256) {
        (
            uint80 roundID,
            int256 price,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        ) = priceFeed.latestRoundData();
        return price;
    }

    function getDecimals() external view returns (uint8) {
        return priceFeed.decimals();
    }
}

// To convert to human-readable price:
// uint256 price = uint256(getLatestPrice());
// uint256 adjusted = price / (10 ** priceFeed.decimals()); // e.g. 8 decimals
```

***

**Canonical knowledge ID:** `code-example:chainlink-price-feed-solidity`