Chainlink

Easily Sell Your APIs and Data to Any Blockchain via Chainlink

Data Vendors and API Providers can sell their data to any blockchain network through a single integration with Chainlink, allowing them to monetize their data for the growing smart contact economy by selling it to the Chainlink Network or providing signed data.

Developers

Fair Sequencing Services: Enabling a Provably Fair DeFi Ecosystem

As part of research conducted at Chainlink Labs, Chainlink is introducing the Fair Sequencing Service. FSS uses oracle networks for fair ordering of transactions sent to a particular smart contract, helping alleviate problems around frontrunning, high gas fees, & miner extractable value.

Education

What is the Blockchain Oracle Problem

The blockchain oracle problem is one the most important barriers to overcome to enable smart contracts on networks like Ethereum to achieve mass adoption across a wide variety of markets and use cases.

Tutorials

APIs, Smart Contracts, and How to Connect Them

Chainlink's external adapter architecture gives Solidity and other blockchain developers a framework to interact with any external API.

Announcements

Introducing the Chainlink Community Grant Program

As the Chainlink’s usage, network size and technical community is now entering a new stage of rapid growth, we do feel it’s important to continually support that growth through a Chainlink Community Grant Program.

Education

Data Quality for DeFi Smart Contracts

We examine how Chainlink Price Reference Data provides the highest level of data quality to smart contracts & how to avoid large risks when building oracles.

Announcements

Chainlink VRF: On-chain Verifiable Randomness

Chainlink VRF helps enable and accelerate the development of smart contracts. Developers can easily integrate Chainlink VRF to add verifiable randomness to their smart contracts focused on gaming, security, layer-two protocols and more.

Education

77 Smart Contract Use Cases Enabled By Chainlink

Chainlink is a flexible and generalized framework for building decentralized oracle networks. To inspire developers, here are 77 ways Chainlink can enhance your smart contract applications.

Developers

Random Number Generation in Solidity

Learn how to use Chainlink VRF to generate a random number in a Solidity smart contract and build provably unpredictable outcomes into your Ethereum dApp.

Announcements

IRISnet Receives Grant to Natively Integrate Chainlink on BSN

IRISnet receives a blockchain integration grant to complete a native integration of Chainlink on BSN, enabling BSN dApps to incorporate validated real-world data.

Education

How Axie Infinity Is Advancing Play-to-Earn Gaming With Chainlink

Blockchain-based game Axie Infinity is using the Chainlink Network’s tamper-proof price feeds and verifiable randomness to unlock a new economic model for players worldwide.

Education

Growing Bitcoin Adoption Using Externally Connected Smart Contracts

Through the combination of Bitcoin and Chainlink, innovative on-chain and off-chain financial products can be created that leverage the unique properties of Bitcoin, without requiring any changes to the Bitcoin blockchain itself.

Education

Flash Loans and the Importance of Tamper-Proof Oracles

As the DeFi ecosystem grows, there is an increasing incentive for malicious actors to exploit vulnerabilities. In this post, we walk through flash loan funded oracle attacks and how to prevent them.

Hackathon Winners

Congratulations to ETHGlobal’s 2020 Hackathon Winners

Learn about the winning Chainlink projects from the ETHOnline 2020 Hackathon, including a decentralized creators platform, DeFi data stream derivatives, a fiat on-ramp, and more.

Grants

Chainlink Awards Grant to Support the Joint Venture Between ACRE Africa and Etherisc

Chainlink grant awarded to support a joint venture formed between Etherisc and ACRE Africa aimed at delivering sustainable, blockchain-based parametric crop insurance solutions to smallholder farmers in Africa.

Education

Unlocking Synthetic Derivatives With Chainlink Oracles

We've developed a novel price oracle with Synthetix to power sOIL, a synthetic oil derivative. This is another example of how Chainlink bringing traditional financial assets to DeFi.

Developers

Testing Chainlink Smart Contracts

Always test before you deploy. This tutorial covers how to test Chainlink smart contracts in Solidity and JavaScript using testnets, mocks, helper functions, and more.

Education

Digital Identity on the Blockchain: Securing User Data With Chainlink

Digital Identity (D-ID) is a critical component of the Internet experience. We examine the risks and challenges with legacy D-ID implementations, introduce innovative blockchain D-ID solutions, and analyze how Chainlink oracles play a key part in connecting personal information to the blockchain.

Developers

Build an RFID Blockchain Integration With Chainlink External Adapters

This tutorial explains how a Chainlink node and External Adapter can be used to integrate a smart contract with an RFID scanner.

Announcements

Protofire Receives a Chainlink Community Grant for an Integration with xDai

Protofire is receiving a Chainlink Grant for a native integration of Chainlink into the xDai blockchain to support the many Chainlink ecosystem projects building on its platform.

Education

Analyze Decentralized Oracles in Real-Time With Chainlink’s Price Feed Visualizations

Chainlink’s Price Feed visualizations promote transparency across the DeFi space by showcasing the composition and real-time performance of decentralized oracle networks that feed price reference data to smart contracts.

Engineering

How to Get Random Numbers in an NFT (ERC721)

This tutorial walks through the development of a simple NFT/ERC721 that generates random numbers in its attributes, making it ideal for Pokemon GO, Dungeons and Dragons, or any other similar application.

Developers

How to Connect a Tesla Vehicle API to a Smart Contract Via a Chainlink External Adapter

This tutorial explains how a Chainlink node and External Adapter can be used to integrate a smart contract to a Tesla vehicle.

Announcements

Fiews Awarded Chainlink Community Grant

Fiews is receiving a Chainlink Community grant to expand their role as an infrastructure provider in the Chainlink ecosystem, particularly providing Chainlink node operators with backup Ethereum nodes and supporting additional blockchain environments.

Developers

Build a DeFi Call Option Exchange With Chainlink Price Feeds

This tutorial walks through the development of a simple exchange for call options using Chainlink Price Feeds and covers a multitude of Solidity topics in the process.

Education

How Chainlink Is Helping Blockchain Cross the Chasm Into the Mainstream

Demand is growing in global markets for security and transparency around financial transactions. Here’s how Chainlink’s oracle networks are accelerating DeFi and helping existing systems connect to trusted, decentralized infrastructure.

Grants

Professor Xiao Wang Awarded Chainlink Research Grant

Professor Xiao Wang, a leading computer security, privacy, and cryptography researcher, has been selected as a research grant recipient from the Chainlink Community Grant Program. He will be collaborating with Chainlink Labs and our research team to work on the future development of DECO.

Announcements

Chainlink VRF Now Live on Ethereum Mainnet

Chainlink VRF (Verifiable Random Function) is now live on the Ethereum mainnet, generating a highly secure and provably fair source of on-chain randomness for numerous smart contract applications.

Education

What Is a Chainlink Node Operator?

The Chainlink Network is made of a growing collection of secure node operators who power decentralized oracle networks across a multitude of blockchains. Through numerous interfaces, developers can discover these nodes and use them to power their unique decentralized applications.

Announcements

Giulia Fanti Awarded Chainlink Research Grant

Giulia Fanti, a leading blockchain and distributed systems academic researcher, is receiving a Chainlink grant to conduct further research into order fairness and scalable networking around the further scaling of an oracle network like Chainlink.

Developers

OAuth and API Authentication in Smart Contracts

Chainlink external adapters make it easy to connect API authentication processes to smart contracts. Here’s an example with the Reddit API and Twitter API, which each require OAuth.

Education

DeFi Yield Farming Explained

Yield farming is the newest phenomenon within DeFi that financially rewards users for providing a service to the protocol, typically through the provisioning of liquidity within a decentralized application's ecosystem.