Chainlink Developers

Welcome to the Chainlink documentation site. You'll find comprehensive guides and documentation to help you start working with Chainlink as quickly as possible, as well as support if you get stuck. Click here for an introductory walkthrough on how to create a Chainlink request on the Ropsten test network!

Building on Chainlink? Click here to get started!

Get Started

Start using Chainlink

Get started by creating a Chainlinked Project

Build a smart contract connected to off-chain data sources using chainlink oracles.

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Explore our Reference Data Contracts for DeFi

Learn how you can use on-chain reference contracts to securely launch and/or improve the security of your DeFi smart contracts.

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Learn with an End-To-End Example Walkthrough

Follow the complete example of executing a Chainlink project from start to finish.

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Request & Receive Data

Chainlink can provide your smart contract with access to any external API you want to connect with.

Create a Request

Pre-built Chainlinks

Explore our collection of pre-made Chainlinks, which will easily connect your smart contract to a specific API.

Testnet Mainnet

Discover Chainlinks

Find everything to build your connected contracts on the world's first oracle Market.

Chainlink Market ↗

Chainlink Documentation

Explore Chainlink Developer Tools

Still have some questions?

Find answers to our most commonly asked questions.