Overview
Chainlink is a decentralized oracle network that connects smart contracts to real-world data like price feeds, random numbers, and external APIs. It's widely used to bring off-chain data onto any EVM blockchain.
Beginner Tip
The easiest entry point is Chainlink's Data Feeds — price feed contract addresses for ETH/USD, BTC/USD, and others are published per-network so you can query them directly with a few lines of Solidity or ethers.js.
Available Data
Example Response
{
"status": "success",
"data": {
"result": "Data from Chainlink",
"description": "Build hybrid smart contracts with Chainlink",
"timestamp": "2025-01-15T10:00:00Z"
}
} Field Reference
roundId Identifier for the oracle update round; increases with each new price report. answer The raw price value as an integer; divide by 10^decimals() to get the actual price. startedAt Unix timestamp when this oracle round started collecting responses. updatedAt Unix timestamp when the aggregated answer was last written on-chain; use to check data freshness. answeredInRound Round in which the answer was computed; should equal roundId for a valid response. Implementation Example
const url = "https://chain.link/developer-resources";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Matrix Score Breakdown
Fully tested on Apr 5, 2026
Technical Specifications
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