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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.

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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;
   }
RUN
Weather Data
function requestAvgTemp(
   ) external {
       Chainlink.Request memory req = buildChainlinkRequest(
           avgTempJobId,
           address(this),
           this.fulfillAvgTemp.selector
       );
       sendChainlinkRequest(req, fee);
   }
RUN
Sports Data
function requestScore(
   ) external {
       Chainlink.Request memory req = buildChainlinkRequest(
           sportScoreJobId,
           address(this),
           this.fulfillWinner.selector
       );
       sendChainlinkRequest(req, fee);
   }
RUN
Keepers
function checkUpkeep(
   bytes calldata checkData
 )
   external
   returns (
       bool upkeepNeeded,
       bytes memory performData
   );
RUN
Randomness
unit256 public randomResult;
f
unction fulfillRandomness(uint256 requestId, unit256[] randomness) internal override {
      randomResult = (randomness[0] % 50) + 1;
}


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;
}

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.

What is Chainlink?

Powering the future of smart contracts

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