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Chainlink is a decentralized oracle service, the first of its kind. When Ethereum went live in 2015, it revolutionized what blockchain could bri...

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Expanding the Chainlink Bug Bounty Program

The Chainlink Bug Bounty Program now provides $100,000 in cash or LINK for the responsible disclosure of critical vulnerabilities in the Chainlink codebase....

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Chainlink Achieves Major Scalability Upgrade With Mainnet Launch of Off-Chain Reporting (OCR)

Chainlink’s newest core client reduces network operating costs by up to 90% and enables Chainlink oracles to bring 10x more data on-chain to power smart contract development. ...

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Brand-Based vs. Math-Based Agreements

Chainlink Co-founder Sergey Nazarov explains the shortcomings of brand-based agreements and how math-based smart contracts eliminate counterparty risk and increase transparency in global financial markets. ...

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Announcing the Spring 2021 Chainlink Virtual Hackathon

Registration is now open for Chainlink’s Spring 2021 Virtual Hackathon. Compete for $80k+ in prizes, tune into technical workshops with top Web3 projects, and connect with devs across the smart contract ecosystem....

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block42 Receives Grant to Natively Integrate Chainlink on Fantom

block42 receives a community grant to natively integrate Chainlink into the Fantom Network, allowing for the creation of externally-connected smart contract applications on Fantom....

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Building a Service-Oriented Architecture for the Smart Contract Ecosystem

Chainlink Co-founder Sergey Nazarov explains how service-oriented architecture is powering smart contract development and innovative composability in DeFi....

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Chainlink Expands Grant Program to Support Social Impact Projects

Chainlink offers social impact grants to startups, non-profits, & NGOs using universally connected smart contracts to create a more economically fair world....

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Kurtosis Awarded a Grant to Build Testing Platform for Chainlink Oracle Networks

Kurtosis receives a grant to construct an automated and extensible testing platform that validates the scalability and reliability of Chainlink oracle networks....

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Fetch Foreign Exchange Rates in Solidity Smart Contracts

In this technical tutorial, learn how to use Chainlink Price Feeds to obtain real-time Foreign Exchange (FX) price data in your smart contract....

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Convert a Vending Machine to Accept Cryptocurrency Payments Using Chainlink Price Feeds

This developer tutorial from Chainlink Virtual Hackathon winner Ted Nivan explains how to use Chainlink to convert a vending machine to accept payments in ETH. ...

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Chainlink Community Advocates Awarded Grant to Build Chainlink Academy

Chainlink Community Advocates Cole Gendreau and Zak Ayesh receive a grant to create Chainlink Academy—an interactive coding platform for learning how to build universally connected smart contracts....

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Build a dApp on Binance Smart Chain With Secure Data Feeds

Learn how to connect your smart contracts to Chainlink’s tamper-proof oracles on Binance Smart Chain’s EVM-compatible network. ...

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How to Use Chainlink With Hardhat

Hardhat offers a feature-rich development environment for Ethereum developers. In this tutorial, we walk through how to get started with Chainlink using Hardhat for fetching external data in your smart contracts and more. ...

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Chainlink Joins the UNESCO Global Education Coalition to Advance Smart Contract Education Internationally

Chainlink officially joins the UNESCO Global Education Coalition to increase the global awareness, education, and social impact of blockchains, smart contracts, and oracle technology....

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Build Your Career Around Blockchains With Chainlink

With the rapid growth of the Chainlink Network, we’re growing the team to meet the continuously accelerating demand for secure oracles and validated data....

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Develop a DeFi Project Using Python

Learn how to use web3.py, Brownie’s Python-based development framework, and Chainlink oracles to build a DeFi smart contract that fetches reliable crypto price data. ...

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Build a Marine Insurance Smart Contract With Chainlink

In this technical tutorial from Chainlink Virtual Hackathon winners, learn how to call marine water level data to a parametric insurance smart contract using a Chainlink External Adapter. ...

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What Is Chainlink? A Beginner’s Guide

Learn about Chainlink using our beginner’s guide, which introduces blockchain oracles, the oracle problem, and universally connected smart contracts....

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Vulcan Link Receives a Grant to Integrate Chainlink on SKALE Network

Vulcan Link receives a community grant to integrate Chainlink into the SKALE Network, allowing developers to build smart contract applications using real-world data and external APIs....

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What Are Stablecoins?

Stablecoins are an increasingly popular mechanism for bringing stability to the DeFi ecosystem. Here’s how they work, as well as popular examples that use Chainlink to ensure end-to-end security....

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Growing the Smart Contract Ecosystem With New Data Types

Chainlink is driving the growth of the smart contract ecosystem by continuously bringing new datasets and off-chain resources on-chain, broadening the number of use cases....

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The Initiative for Cryptocurrencies and Contracts (IC3) Awarded a Chainlink Research Grant

IC3 awarded a Chainlink grant to conduct research that improves oracle networks like Chainlink, as well as the underlying blockchain, smart contract, and data infrastructure Chainlink supports....

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Build a Secure One-Time Pad (OTP) Key Generator With Chainlink VRF

This technical tutorial explains how to use Chainlink VRF to create a secure and provably random one-time pad key for encrypted messaging apps. ...

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Protofire Receives a Grant for Native Integration of Chainlink on Avalanche

Protofire is receiving a grant for a native integration of Chainlink into the Avalanche blockchain, supporting projects building externally connected smart contracts on Avalanche....

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Circuit Breakers and Client Diversity Within the Chainlink Network

Chainlink circuit breakers and client diversity ensure hyper-reliability of Chainlink Price Feeds, protecting user funds from an unexpected black swan event....

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How to Fetch the Current Price of Ethereum, Bitcoin, and Other Cryptocurrencies in Solidity

In this technical tutorial, learn how to use Chainlink Price Feeds to obtain real-time cryptocurrency price data in your smart contract....

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Cdot Receives a Grant for Native Integration of Chainlink on Solana

Cdot receives a blockchain integration grant co-sponsored by Chainlink, Solana, and Serum to natively integrate Chainlink oracles on the Solana blockchain....

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The 3 Levels of Data Aggregation in Chainlink Price Feeds

Chainlink Price Feeds incorporate three levels of data aggregation in each price update on-chain: at the data source, node operator, and oracle network level....

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Introducing the Chainlink On-Chain Data Directory: Data.eth

The Chainlink On-Chain Data Directory uses the data.eth ENS domain name to create a decentralized on-chain index of human-readable Chainlink Price Feed addresses....

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TheLinkMarine Receives a Grant to Build a Chainlink News Website

TheLinkMarine is receiving a grant to develop and maintain a new Chainlink News website—a full spectrum resource for consuming all Chainlink-related news....

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Build, Deploy, and Sell Your Own Dynamic NFT

Learn how to deploy, showcase, and sell your dynamic non-fungible token (NFT) on the OpenSea Marketplace using Chainlink VRF....

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Using Chainlink Oracles on Matic Network

Learn how to build a scalable DeFi dApp with secure price feeds by using Chainlink’s decentralized oracles on the Matic Network. ...

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BlockSpaces and LinkUp Florida Receive a Grant to Integrate Chainlink on NEAR Mainnet

BlockSpaces and LinkUp Florida receive a joint Chainlink grant for a native integration of Chainlink on the NEAR blockchain, supporting the many NEAR dApp developers....

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What Is a Decentralized Money Market?

Decentralized money markets enable users to borrow and lend their crypto assets in a permissionless manner. In this article, we explore how DeFi money markets work and why they need secure price feeds....

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How to Build a Parametric Insurance Smart Contract

In this technical tutorial, learn how to use Chainlink nodes and Price Feeds to build a Solidity smart contract for a parametric crop insurance product. ...

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SmartPy Receives Grant to Integrate Chainlink Price Feeds on Tezos

SmartPy receives a grant to integrate Chainlink Price Feeds on Tezos and build out a more advanced monitoring solution for the cross-chain integration....

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Chainlink Awards Grant to Anyblock Analytics

Anyblock Analytics receives a grant to build a Chainlink node operator dashboard, create CSV export functions, and enable one-click management of earned LINK in Flux Monitor Contracts....

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Announcing the Chainlink Builders Program

This program gives our active technical community members rewards for building, testing, and supporting others in Discord. Earn badges and redeem them for gear, NFTs, and sponsored prizes....

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Chainlink Proof of Reserve: Bringing Transparency to DeFi Collateral

Chainlink Proof of Reserve provides on-chain smart contracts with definitive truth on the collateralization of tokens backed by off-chain assets commonly used in DeFi as collateral....

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Chainlink Participating in Gitcoin Grants Round 8 to Support Ethereum Infrastructure

Chainlink is participating in Gitcoin Grants Round 8 as a matching partner to fund community-selected projects focused on improving Ethereum's infrastructure....

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Using Chainlink Oracles to Securely Utilize Curve LP Pools

DeFi protocols needing to price Curve LP tokens in stablecoins or cryptocurrencies should use Chainlink Price Feeds to avoid flash loan attacks....

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Connect a Smart Contract to the Twitter API

This developer tutorial explains how to connect to the Twitter API via Chainlink so you can trigger tweets directly from a smart contract. ...

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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. ...

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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. ...

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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....

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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. ...

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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....

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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....

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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....

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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....

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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....

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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. ...

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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....

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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. ...