Chainlink Developers Starter Kit Showcase

We’re excited to announce the Chainlink Developers Starter Kit Showcase, a developer-focused initiative that will run throughout the month of May. Over the next month, we encourage you to experiment with our Starter Kits, either by building smart contracts that use Chainlink Price Feeds, VRF, or Any-API functionality, or by improving the Starter Kits in … Read more

How to Connect a Two-Factor Authentication (2FA) API to a Smart Contract With Chainlink

Digital Bridge, the Chainlink Judges’ Pick Award from the Unitize Hackathon, used a Chainlink External Adapter to connect a 2FA API to a Chainlink oracle for decentralized verification of a 2FA PIN’s validity. Their 2FA smart contract is a great example of how Chainlink’s customizable and secure oracle infrastructure can be used to connect off-chain … Read more

Craft Whiskey Crypto Payments With Chainlink Oracles

For their Chainlink bounty-winning submission at the 2021 ETHGlobal MarketMake Hackathon, Jasper and Tillman Degens created Whiskey MarketMaker, a DeFi platform that leverages Chainlink oracles to enable small-batch whiskey distilleries to tokenize and list maturing bottles of whiskey for investors, while also allowing distilleries to earn interest on ETH earned from sales via an Aave … Read more

Congratulations to the Spring 2021 Chainlink Virtual Hackathon Winners

The Spring 2021 Chainlink Hackathon saw record-breaking developer turnout, with 4,000+ signups, 140+ project submissions, and participants hailing from 170+ countries and multiple blockchains across the ecosystem. Developers of all experience levels and technical backgrounds came together to discover the broad capabilities of Chainlink’s oracle infrastructure and build a wide range of hybrid smart contracts … Read more

Get Index Prices in Solidity Smart Contracts

DeFi asset prices can experience large amounts of volatility, especially in illiquid markets. This is a major reason why it’s important to build smart contracts around aggregated price data that reflects broad market coverage and that is highly resistant to low liquidity price source manipulations. Volatility is an important consideration for both developers integrating an … Read more

Blockchain Hackathon Tips for Building a Winning Submission

The Spring 2021 Chainlink Virtual hackathon is now well underway, with thousands of dApp developers building a wide variety of  projects that are pushing innovation forward in the smart contract ecosystem. With the midway check-in point just behind us, many teams and individual hackers are now looking to refine their projects into polished submissions that … Read more

Build a dApp on xDai Chain With Secure Data Feeds

xDai chain is an Ethereum-based stable sidechain that uses USD-backed stablecoin xDai (a representation of DAI token) as the native coin of the network, offering developers fast, inexpensive, and stable transactions. As the most widely adopted decentralized oracle network, Chainlink is the go-to oracle solution for xDai developers, integrating natively with xDai Chain to power … Read more

How to Get a Random Number on Polygon

Polygon (formerly known as Matic Network) is a protocol and a framework for building and connecting Ethereum-compatible blockchain networks. Initially focusing on Ethereum scaling solutions that utilize Proof of Stake (PoS) sidechains and a Plasma framework, in rebranding to Polygon, they’ve also added other major scaling solutions such as zk-Rollups and Optimistic Rollups, as well … Read more

Congratulations to the ETHDenver 2021 Hackathon Chainlink Bounty Winners

The Spring 2021 Chainlink Virtual Hackathon is underway! Sign up today to compete for $125k+ in prizes. We’re happy to announce the Chainlink bounty winners for the 2021 ETHDenver Hackathon. These projects showcased unique smart contract functionalities using Chainlink’s oracle network in a wide variety of ways, including calling off-chain APIs for GitHub repos, municipal … Read more