dyzz/TellorCore

Overview

Ethereum smart contracts cannot access off-chain data. If your smart contract relies on off-chain (e.g. internet) data to evaluate or execute a function, you either have to manually feed the data to your contract, incentivize users to do it, or rely on a centralized party to provide the data.

The Tellor oracle is a decentralized oracle. It provides an option for contracts to securely interact with and obtain data from off-chain.

For more indepth information about Tellor checkout our documenation, whitepaper and FAQ page.

Quick references are included below:

Implement Tellor into your project

Use npm to istall the usingTellor repo.

npm install usingTellor

Import UsingTellor.sol into your smart contract and ensure your contract inherits from it by adding "is UsingTellor".
Pass through the user contract address ( 0x09459fdafD6Fdce14E04B3487A656FBca0b953ea ) in your constructor. See example below:

pragma solidity ^0.5.0;

import './UsingTellor.sol';

contract YourContract is UsingTellor{
 ...
    constructor(address _userContract) UsingTellor(_userContract) public{

    }   
    /**
    * @dev Allows the user to get the latest value for the requestId specified
    * @param _requestId is the requestId to look up the value for
    * @return bool true if it is able to retreive a value, the value, and the value's timestamp
    */
    function getLastValue(uint256 _requestId) public view returns (bool ifRetrieve, uint256 value, uint256 _timestampRetrieved) {
        return getCurrentValue(_requestId);
    }
 ...
}