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API Source
We are using Chainlink Oracle / VRF to interact to our Ecosystem. Chainlink helps us be transparent in blockchain
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
import "@chainlink/contracts/src/v0.8/ChainlinkClient.sol";
import "@chainlink/contracts/src/v0.8/ConfirmedOwner.sol";
/**
* Request testnet LINK and ETH here: https://faucets.chain.link/
* Find information on LINK Token Contracts and get the latest ETH and LINK faucets here: https://docs.chain.link/docs/link-token-contracts/
*/
/**
* THIS IS AN EXAMPLE CONTRACT WHICH USES HARDCODED VALUES FOR CLARITY.
* THIS EXAMPLE USES UN-AUDITED CODE.
* DO NOT USE THIS CODE IN PRODUCTION.
*/
contract APIConsumer is ChainlinkClient, ConfirmedOwner {
using Chainlink for Chainlink.Request;
uint256 public volume;
bytes32 private jobId;
uint256 private fee;
event RequestVolume(bytes32 indexed requestId, uint256 volume);
/**
* @notice Initialize the link token and target oracle
*
* Sepolia Testnet details:
* Link Token: 0x779877A7B0D9E8603169DdbD7836e478b4624789
* Oracle: 0x6090149792dAAeE9D1D568c9f9a6F6B46AA29eFD (Chainlink DevRel)
* jobId: ca98366cc7314957b8c012c72f05aeeb
*
*/
constructor() ConfirmedOwner(msg.sender) {
setChainlinkToken(0x779877A7B0D9E8603169DdbD7836e478b4624789);
setChainlinkOracle(0x6090149792dAAeE9D1D568c9f9a6F6B46AA29eFD);
jobId = "ca98366cc7314957b8c012c72f05aeeb";
fee = (1 * LINK_DIVISIBILITY) / 10; // 0,1 * 10**18 (Varies by network and job)
}
/**
* Create a Chainlink request to retrieve API response, find the target
* data, then multiply by 1000000000000000000 (to remove decimal places from data).
*/
function requestVolumeData() public returns (bytes32 requestId) {
Chainlink.Request memory req = buildChainlinkRequest(
jobId,
address(this),
this.fulfill.selector
);
// Set the URL to perform the GET request on
req.add(
"get",
"https://min-api.cryptocompare.com/data/pricemultifull?fsyms=ETH&tsyms=USD"
);
// Set the path to find the desired data in the API response, where the response format is:
// {"RAW":
// {"ETH":
// {"USD":
// {
// "VOLUME24HOUR": xxx.xxx,
// }
// }
// }
// }
// request.add("path", "RAW.ETH.USD.VOLUME24HOUR"); // Chainlink nodes prior to 1.0.0 support this format
req.add("path", "RAW,ETH,USD,VOLUME24HOUR"); // Chainlink nodes 1.0.0 and later support this format
// Multiply the result by 1000000000000000000 to remove decimals
int256 timesAmount = 10 ** 18;
req.addInt("times", timesAmount);
// Sends the request
return sendChainlinkRequest(req, fee);
}
/**
* Receive the response in the form of uint256
*/
function fulfill(
bytes32 _requestId,
uint256 _volume
) public recordChainlinkFulfillment(_requestId) {
emit RequestVolume(_requestId, _volume);
volume = _volume;
}
/**
* Allow withdraw of Link tokens from the contract
*/
function withdrawLink() public onlyOwner {
LinkTokenInterface link = LinkTokenInterface(chainlinkTokenAddress());
require(
link.transfer(msg.sender, link.balanceOf(address(this))),
"Unable to transfer"
);
}
}
Last modified 7mo ago