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 Chainlink Explore solutions

Questions?

Transaction Value Enabled:

6,673,435,298,072

Start building your hybrid smart contract with Chainlink

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int256:
34361000000

function getThePrice() public view returns (int) {
        (
            uint80 roundID, 
            int price,
            uint startedAt,
            uint timeStamp,
            uint80 answeredInRound
        ) = priceFeed.latestRoundData();
        return price;
    }

Integrate Price Feeds

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uint256:
30218644067796614000

function requestAvgTemp(
    ) external {
        Chainlink.Request memory req = buildChainlinkRequest(
            avgTempJobId,
            address(this),
            this.fulfillAvgTemp.selector
        );
        sendChainlinkRequest(req, fee);
    }

Integrate weather data

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int256:
168000000000000000000

function requestScore(
    ) external {
        Chainlink.Request memory req = buildChainlinkRequest(
            sportScoreJobId,
            address(this),
            this.fulfillWinner.selector
        );
        sendChainlinkRequest(req, fee);
    }

Integrate sports data

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TRUE

function checkUpkeep(
    bytes calldata checkData
  )
    external
    returns (
        bool upkeepNeeded,
        bytes memory performData
    );

Integrate Chainlink Automation

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int256:
1164636110501196599387136881304611
0418128642690385609708155250752713
810786281

unit256 public randomResult; 
function fulfillRandomness(uint256 requestId, unit256[] randomness) internal override {
       randomResult = (randomness[0] % 50) + 1;
}

Integrate Chainlink VRF

RUN

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int256:
425500000000000000000

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

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.

Highly reliable automation

Use a decentralized network of Chainlink Automation 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.

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.”

“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.”

“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.”

“Many people overlook the importance of oracles in their smart contract application. The reality that we see time and time again is that a smart contract application’s security is only as strong as its oracle. That’s why it was so important for our team to find an oracle that matched Trader Joe’s strong commitment to security.”

View Chainlink Data Feeds Explore solutions

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Verifiable randomness

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.

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

‘Proof of Reserves’ Emerges as a Favored Way to Prevent Another FTX

The blowup has reinvigorated the discussion about a potential solution, something called "proof of reserves," or PoR, a way of showing – with little or no doubt – exactly how many tokens are at any exchange that adopts the technique.

Former Google CEO Eric Schmidt Shares What It Takes To Win In Web3 At SmartCon 2022

One of the most highly anticipated speakers at SmartCon 2022 was former Google CEO Eric Schmidt, who became a strategic advisor to Chainlink Labs last December.

Chainlink Announces Staking Plans, Aiming to Be AWS of Web3

At SmartCon 2022, Chainlink Co-founder Sergey Nazarov unveils plans to launch staking in December, plus a new economic model for the Web3 services platform.

‘Proof of Reserves’ Emerges as a Favored Way to Prevent Another FTX

Former Google CEO Eric Schmidt Shares What It Takes To Win In Web3 At SmartCon 2022

One of the most highly anticipated speakers at SmartCon 2022 was former Google CEO Eric Schmidt, who became a strategic advisor to Chainlink Labs last December.

Chainlink Announces Staking Plans, Aiming to Be AWS of Web3

At SmartCon 2022, Chainlink Co-founder Sergey Nazarov unveils plans to launch staking in December, plus a new economic model for the Web3 services platform.

Can proof-of-reserves prevent future crypto exchange collapses?

Proof-of-reserves (PoR) are independent audits by third parties that aim to provide transparency and evidence that a custodian holds the assets it claims to own on behalf of its clients.

Securely connect smart contracts with off-chain data and services

Start building your hybrid smart contract with Chainlink

Highly secure and flexible infrastructure

Reliable, tamper-proof network

Seamless connection to any API

Proven, ready-made solutions

Highly reliable automation

What is Chainlink?

The industry standard oracle network

Powering the future of smart contracts

Start building with Chainlink

Verify Stablecoin Collateral With Chainlink

How to Connect Any API with Chainlink

How to Fetch Cryptocurrency Prices in Solidity

Build, Deploy, and Sell Your Own Dynamic NFT

Join Chainlink’s global open-source community

Get involved through our grant programs

Community grant program

Integration grants

Social Impact program

Research program

Chainlink news

‘Proof of Reserves’ Emerges as a Favored Way to Prevent Another FTX

Former Google CEO Eric Schmidt Shares What It Takes To Win In Web3 At SmartCon 2022

Chainlink Announces Staking Plans, Aiming to Be AWS of Web3

‘Proof of Reserves’ Emerges as a Favored Way to Prevent Another FTX

Former Google CEO Eric Schmidt Shares What It Takes To Win In Web3 At SmartCon 2022

Chainlink Announces Staking Plans, Aiming to Be AWS of Web3

Can proof-of-reserves prevent future crypto exchange collapses?

Securely connect smart contracts with off-chain data and services

Start building your hybrid smart contract with Chainlink

Highly secure and flexible infrastructure

Reliable, tamper-proof network

Seamless connection to any API

Proven, ready-made solutions

Highly reliable automation

What is Chainlink?

The industry standard oracle network

Powering the future of smart contracts

Start building with Chainlink

Verify Stablecoin Collateral With Chainlink

How to Connect Any API with Chainlink

How to Fetch Cryptocurrency Prices in Solidity

Build, Deploy, and Sell Your Own Dynamic NFT

Join Chainlink’s global open-source community

Get involved through our grant programs

Community grant program

Integration grants

Social Impact program

Research program

Chainlink news

‘Proof of Reserves’ Emerges as a Favored Way to Prevent Another FTX

Former Google CEO Eric Schmidt Shares What It Takes To Win In Web3 At SmartCon 2022

Chainlink Announces Staking Plans, Aiming to Be AWS of Web3

‘Proof of Reserves’ Emerges as a Favored Way to Prevent Another FTX

Former Google CEO Eric Schmidt Shares What It Takes To Win In Web3 At SmartCon 2022

Chainlink Announces Staking Plans, Aiming to Be AWS of Web3

Can proof-of-reserves prevent future crypto exchange collapses?

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