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Questions tagged [chainlink]

Chainlink is a decentralized oracle technology connecting smart contracts on any blockchain to data providers, web APIs, enterprise systems, cloud services, IoT devices, payment systems, other blockchains, and more. This tag should be applied to any question about building or debugging decentralized oracles with Chainlink.

Chainlink is a technology for connecting smart contracts on any blockchain to data providers, web APIs, enterprise systems, cloud services, IoT devices, payment systems, other blockchains, and much more. The technology was envisioned by Sergey Nazarov, Ari Juels, and Steve Ellis. The Chainlink whitepaper was published in 2017 and the mainnet went live on Ethereum on May 2019. Chainlink is being built with .

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How to make a Smart Contract purchase LINK (or other ERC20) tokens automatically?

I am trying to interact with the Chainlink VRF function. I have a Coordinator contract that needs random numbers to draw cards out of a deck. The Coordinator calls a Random Number Generation Oracle that implements Chainlink's VRFConsumerBase…
Alexandru Chiriac
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Find price feed contracts Addresses of chainlink within smart contracts

I am developing a contract in which I have to check whether the incoming token is paired with USD to get the price feed of Chainlink from the smart contract. Only such tokens are going to be added to my smart contract. Does Chainlink have any…
Keerthana Ramalingam
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How to Transfer NFTs using Chainlink's Automation/Keeper (checkUpkeep & performUpKeep)

I'm working on an NFT Auction contract. I'm trying to achieve 1. NFT transfer to the highest bidder. 2. highest bidder's bid value to the prev NFT owner or Auction creator. 3. A small platform cut sent to the contract's owner. All this is working…
DevABDee
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Chainlink NFT: Unable to update Metadata on Rinkeby Opensea

Hi I was was trying out the Chainlink Dynamic Truffle NFT project following along the video https://www.youtube.com/watch?v=EzZEx0lumr0&t=224s The goal of this contract is to use the VRF random number generator and then create random characters. I…
Sandman2145
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How do I install dependencies for Yarn?

trying to install yarn for my chainlink node. This is the error I'm getting. Any thoughts? node -e "if(process.env.npm_execpath.indexOf('yarn') === -1) throw new Error('Please use yarn to install dependencies\n\n')"
Clint Oka
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how should i use chainlink keeper

I'm learning free code camp solidity-js,（https://github.com/PatrickAlphaC/hardhat-smartcontract-lottery-fcc） following the video I wrote the code I have deployed the raffle contract, and set up chainlink keeper, chainlink vrf, but when I run…
0xnu
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Start the Chainlink Node - Connection Refused

enter image description hereCode ran... cd ~/.chainlink-kovan && docker run -p 6688:6688 -v ~/.chainlink-kovan:/chainlink -it --env-file=.env smartcontract/chainlink:0.10.9 local n Error recieved... error starting app: dial tcp 127.0.0.1:8546:…
Earlson Satine
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I want to know about Is chainlink supports aptos blockchain? If yes then please provide relevant developer docs

I want to know about Is chainlink supports aptos blockchain? If yes then please provide relevant developer docs. If not supported then is there any plans adopt aptos blockchain? Developer resources regarding chainlink support for aptos blockchain.…
Shivprasad Komul
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Lesson 7: yarn hardhat deploy --tags mocks -> returns error (Full Blockchain Solidity Course 2022 - timestamp: 10:49.24)

yarn hardhat deploy --tags mocks returns Error: expected 0 constructor arguments, got 2 after running line local detected! Deploying mocks... An unexpected error occurred: Checked my code several times but all seems identical to video lesson. Help…
DorianDaSilva
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