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Securely connect smart contracts with off-chain data and services

Chainlink decentralized oracle networks provide tamper-proof inputs, outputs, and computations to support advanced smart contracts on any blockchain.

Develop with ChainlinkExplore solutions

Questions? 

AAVE logo
Synthetix logo
Paxos logo
Celsius logo
Nexus Mutual logo
ENS logo
AAVE logo
Synthetix logo
Paxos logo
Celsius logo
Nexus Mutual logo
ENS logo
TOTAL VALUE SECURED:
$
37,338,097,875.45
Total US dollar value of crypto assets deposited into markets secured by Chainlink oracles.
Updated
May 31, 2022

Start building your hybrid smart contract with Chainlink

Data & Services
RUN
Market Data
function getThePrice() public view returns (int) {
       (
           uint80 roundID,
           int price,
           uint startedAt,
           uint timeStamp,
           uint80 answeredInRound
       ) = priceFeed.latestRoundData();
       return price;
   }
Integrate Price Feeds
RUN
Weather Data
function requestAvgTemp(
   ) external {
       Chainlink.Request memory req = buildChainlinkRequest(
           avgTempJobId,
           address(this),
           this.fulfillAvgTemp.selector
       );
       sendChainlinkRequest(req, fee);
   }
Integrate weather data
RUN
Sports Data
function requestScore(
   ) external {
       Chainlink.Request memory req = buildChainlinkRequest(
           sportScoreJobId,
           address(this),
           this.fulfillWinner.selector
       );
       sendChainlinkRequest(req, fee);
   }
Integrate sports data
RUN
Keepers
function checkUpkeep(
   bytes calldata checkData
 )
   external
   returns (
       bool upkeepNeeded,
       bytes memory performData
   );
Integrate Chainlink Keepers
RUN
Randomness
unit256 public randomResult;
function fulfillRandomness(uint256 requestId, unit256[] randomness) internal override {
      randomResult = (randomness[0] % 50) + 1;
}


Integrate Chainlink VRF
RUN
Any Api
function requestData() public returns (bytes32 requestId)
{
   Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.fulfill.selector);
   request.add("get", "https://my-api.com/endpoint");
   request.add("path", "status");    
   return sendChainlinkRequestTo(oracle, request, fee);
}
function fulfill(bytes32 _requestId, uint256 _response) public recordChainlinkFulfillment(_requestId)
{
   response = _response;
}
Access any external data
Market Data
Weather Data
Sports Data
Keepers
Randomness
Any API

Highly secure and flexible infrastructure

Reliable, tamper-proof network

Use decentralization, trusted nodes, premium data, and cryptographic proofs to connect highly accurate and available data/APIs to any smart contract.

Seamless connection to any API

Build on a flexible framework that can retrieve data from any API, connect with existing systems, and integrate with any current or future blockchain.

Proven, ready-made solutions

Integrate pre-built, time-tested oracle solutions that already secure tens of billions in smart contract value for market-leading decentralized applications.

Secure off-chain computation

Use a decentralized network of Chainlink Keeper nodes to automate contracts, mitigating risk of manual interventions and centralized servers.

Deploy your Chainlink smart contract

What is Chainlink?

The industry standard oracle network

Chainlink greatly expands the capabilities of smart contracts by enabling access to real-world data and off-chain computation while maintaining the security and reliability guarantees inherent to blockchain technology.

Watch a video explaining why Chainlink is the industry standard oracle network.

Powering the future of smart contracts

“Part of composability is that you don’t have to build everything by yourself. Chainlink’s oracle is very good, and it’s part of this whole composability idea, it’s vital.”

Stani Kulechov

CEO

“We really did our due diligence and looked around... Chainlink is definitely the most established, and every time we dealt with them the level of expertise was incredible so I feel like we are in good hands.”

Justin Moses

CTO

“This product is built on the foundation of blockchain technology and utilizes Arbol’s smart contracts along with decentralized weather data provided by Chainlink to offer users a product unlike any other on the market.”

Siddhartha Jha

CEO and Founder

“Integrating industry-leading decentralized oracle technology is the key step in the continued decentralization of Celsius. Partnering with Chainlink solidifies our mission to bring revolutionary financial services to millions around the world.”

Alex Mashinsky

CEO

View Chainlink Data FeedsExplore solutions

Start building with Chainlink

Guides /
Proof of Reserve

Verify Stablecoin Collateral With Chainlink

Guides /
External APIs

How to Connect Any API with Chainlink

Guides /
Price Feeds

How to Fetch Cryptocurrency Prices in Solidity

Guides /
Verifiable randomness

Build, Deploy, and Sell Your Own Dynamic NFT

Read more developer guides

Join Chainlink’s global open-source community

Chainlink is open-source technology that is collectively developed by a large community of developers, researchers, and users who share the goal of building Chainlink into a public good for the benefit of the entire blockchain ecosystem.

Discord
Get involved
Twitter
Read the latest
YouTube
Watch videos
Telegram
Join discussion
GitHub
Build with us

Get involved through our grant programs

Community grant program

Rewarding developers who expand the amount of data available on-chain, enhance the security of the Chainlink node infrastructure, and integrate Chainlink across new systems.

Apply for a community grant

Integration grants

Encouraging projects and teams from all over the world to procure specific technological work and services from Chainlink.

Apply for an integration grant

Social Impact program

Working with nonprofits, NGOs, and socially conscious projects to accelerate hybrid smart contract development and enable an economically fair world.

Apply for a social impact grant

Research program

Funding academics and specialists who conduct and publish innovative research that enhances the security and performance of the Chainlink Network.

Apply for a research grant

Chainlink news

Chainlink Hires Google Vet Who Developed TensorFlow AI System

Chainlink's hiring of a key AI executive could boost the reliability of its oracle, upon which much of the crypto world relies.

Blockchain Tech Is Key to Combating Climate Change, Report Says

Blockchain technology will play a key role in combating climate change by managing clean energy solutions and enabling enhanced automation, a report by Chainlink Labs and Tecnalia says.

Chainlink Labs Taps Former Diem CTO Dahlia Malkhi in Web3 Push

Chainlink Labs has hired Dahlia Malkhi, former chief technology officer at Diem Association, as its chief research officer amid a push to increase Web3 adoption.

Chainlink Hires Google Vet Who Developed TensorFlow AI System

Chainlink's hiring of a key AI executive could boost the reliability of its oracle, upon which much of the crypto world relies.

Blockchain Tech Is Key to Combating Climate Change, Report Says

Blockchain technology will play a key role in combating climate change by managing clean energy solutions and enabling enhanced automation, a report by Chainlink Labs and Tecnalia says.

Chainlink Labs Taps Former Diem CTO Dahlia Malkhi in Web3 Push

Chainlink Labs has hired Dahlia Malkhi, former chief technology officer at Diem Association, as its chief research officer amid a push to increase Web3 adoption.

Ex-Google CEO Eric Schmidt Joins Crypto Project Chainlink as Strategic Advisor

Former Google CEO, Eric Schmidt, has signed on as a strategic advisor to guide the team in its future growth and development.

Read more news

Stay updated on the latest Chainlink news