dagger.js

var Dagger = require("eth-dagger");
var Web3 = require("web3");
var contractJSON = require("./../contracts/SocialBet.json");
let MaticWETHContract =require("./MaticWETHContract.json");
var web3 = new Web3("https://testnet2.matic.network");

var dagger = new Dagger("wss://matic.dagger2.matic.network"); // dagger server

const MaticWETHAddress = '0x31074c34a757a4b9FC45169C58068F43B717b2D0';
const web3MaticWETHContract = new web3.eth.Contract(MaticWETHContract.abi, MaticWETHAddress);

const contract = dagger.contract(web3MaticWETHContract);

var transfer = contract.events.Transfer({ room: "confirmed" });

transfer.watch(function(data, removed) {
 // do something
});