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!

Introduction & Assumptions


Chainlink is a decentralized oracle which can be used to provide external data to Ethereum smart contracts. Connecting external data allows a contract to have knowledge of real-world external events, APIs, and other blockchains.

We are currently on Ropsten, so developers can start creating contracts right now in a testing network (testnet) environment. Ropsten is a great development network for the Ethereum Blockchain. Our goal is to provide a practical development environment so you can be prepared to execute smart contracts on the Ethereum blockchain network when we go live.

Following our Getting Started guide is a great way to understand our system and get a contract that is able to execute based on external data. As a decentralized network, Chainlink allows the execution of decentralized contracts to be executed in a secure manner.


  • You are a software developer building Ethereum contracts in Solidity.
  • Chainlink network currently operates only on Ropsten.
  • Examples in this guide use Remix so you don't need to set up a development environment.
  • You do not need to run a Chainlink or Ethereum node to complete this guide.

What's Next

Download and install MetaMask.

Install MetaMask.