Web3 Provider

Quick Start For Dapps using Web3 Provider

Quick Start For Dapps (Web3 Provider)

You can use the Test Wallet to test your integration at test.walletconnect.org (Source code). Keep in mind that this is not a secure wallet - Do not store funds.

Install

yarn

yarn add web3 @walletconnect/web3-provider

npm

npm install --save web3 @walletconnect/web3-provider

Syntax shown below is Javascript ES6 which requires bundling and transpiling to run in web browsers. If unfamiliar we recommend setting up an environment using Webpack Starter or Create React App

Setup

First, instantiate your WalletConnect web3-provider using the following options: Infura or Custom RPC mapping

Infura

import WalletConnectProvider from "@walletconnect/web3-provider";

//  Create WalletConnect Provider
const provider = new WalletConnectProvider({
  infuraId: "27e484dcd9e3efcfd25a83a78777cdf1",
});

//  Enable session (triggers QR Code modal)
await provider.enable();

Custom RPC

import WalletConnectProvider from "@walletconnect/web3-provider";

//  Create WalletConnect Provider
const provider = new WalletConnectProvider({
  rpc: {
    1: "https://mainnet.mycustomnode.com",
    3: "https://ropsten.mycustomnode.com",
    100: "https://dai.poa.network",
    // ...
  },
});

//  Enable session (triggers QR Code modal)
await provider.enable();

Then you can integrate your dapp using your favorite Ethereum library: ethers.js or web3.js

ethers.js

import { providers } from "ethers";

//  Wrap with Web3Provider from ethers.js
const web3Provider = new providers.Web3Provider(provider);

web3.js

import Web3 from "web3";

//  Create Web3 instance
const web3 = new Web3(provider);

Events (EIP-1193)

After setting up your provider you should listen to EIP-1193 events to detect accounts and chain change and also disconnection.

// Subscribe to accounts change
provider.on("accountsChanged", (accounts: string[]) => {
  console.log(accounts);
});

// Subscribe to chainId change
provider.on("chainChanged", (chainId: number) => {
  console.log(chainId);
});

// Subscribe to session disconnection
provider.on("disconnect", (code: number, reason: string) => {
  console.log(code, reason);
});

Provider Methods

interface RequestArguments {
  method: string;
  params?: unknown[] | object;
}

// Send JSON RPC requests
const result = await provider.request(payload: RequestArguments);

// Close provider session
await provider.disconnect()

Web3 Methods

//  Get Accounts
const accounts = await web3.eth.getAccounts();

//  Get Chain Id
const chainId = await web3.eth.chainId();

//  Get Network Id
const networkId = await web3.eth.net.getId();

// Send Transaction
const txHash = await web3.eth.sendTransaction(tx);

// Sign Transaction
const signedTx = await web3.eth.signTransaction(tx);

// Sign Message
const signedMessage = await web3.eth.sign(msg);

// Sign Typed Data
const signedTypedData = await web3.eth.signTypedData(msg);

Provider Options

Required

In order to resolve non-signing requests you need to provide one of the following:

Infura ID

The infuraId will support the following chainId's: Mainnet (1), Ropsten (3), Rinkeby(4), Goerli (5) and Kovan (42)

const provider = new WalletConnectProvider({
  infuraId: "27e484dcd9e3efcfd25a83a78777cdf1",
});

RPC URL Mapping

The RPC URL mapping should be indexed by chainId and it requires at least one value.

const provider = new WalletConnectProvider({
  rpc: {
    1: "https://mainnet.mycustomnode.com",
    3: "https://ropsten.mycustomnode.com",
    100: "https://dai.poa.network",
    // ...
  },
});

Optional

You can also customize the connector through the provider using the following options

Bridge URL

Use your own hosted bridge by providing the url

const provider = new WalletConnectProvider({
  infuraId: "27e484dcd9e3efcfd25a83a78777cdf1",
  bridge: "https://bridge.myhostedserver.com",
});

Disable QR Code Modal

Use your own custom qrcode modal and disable the built-in one

const provider = new WalletConnectProvider({
  infuraId: "27e484dcd9e3efcfd25a83a78777cdf1",
  qrcode: false,
});

provider.connector.on("display_uri", (err, payload) => {
  const uri = payload.params[0];
  CustomQRCodeModal.display(uri);
});

Filter Mobile Linking Options

If you would like to reduce the number of mobile linking options or customize its order, you can provide an array of wallet names

const provider = new WalletConnectProvider({
  infuraId: "27e484dcd9e3efcfd25a83a78777cdf1",
  qrcodeModalOptions: {
    mobileLinks: [
      "rainbow",
      "metamask",
      "argent",
      "trust",
      "imtoken",
      "pillar",
    ],
  },
});