Add Link Contract For Free

A link contract is an approach to data control in a distributed data sharing network.In XDI, a link contract is a machine-readable XDI document that governs the sharing of other XDI data.

In short, the process works the following way: you create a keeper compatible smart contract, register an upkeep job on the Chainlink Keepers web app, then Chainlink Keepers perform your upkeep jobs at the specified intervals without any further input from you.

Chainlink is a decentralized network of nodes that provide data and information from off-blockchain sources to on-blockchain smart contracts via oracles. This process, along with extra secure hardware, eliminates the reliability issues that might occur if using only a single centralized source.

Step 1: Deploy an Oracle Contract to Kovan.Step 2: Build a New External Adapter.Step 3: Register Adapter URL in a New Chainlink Node.Step 4: Create a Job Specification for the external adapter.Step 5: Register the Chainlink node in the Oracle contract.Step 6: Create a requester contract to submit a request.Apr 29, 2019

Build ChainlinkInstall Go 1.17, and add your GOPATH's bin directory to your PATH.Install NodeJS 12.22 & Yarn.Install Postgres (>= 11.Ensure you have Python 3 installed (this is required by solc-select which is needed to compile solidity contracts)Build and install Chainlink: make install.Run the node: chainlink help.

Currently, the cost from all 21 nodes responding with data back on-chain is 1,358,377 gas ($3.67), with an average cost of 64,684 gas per node ($0.17).

Chainlink is the most widely used decentralized oracle network, currently securing tens of billions in USD value for live applications across numerous blockchains and use cases.