@walletconnect/universal-provider NPM

@walletconnect/universal-provider

Universal Provider for WalletConnect Protocol

Usage

import { ethers } from "ethers";
import UniversalProvider from "@walletconnect/universal-provider";

//  Initialize the provider
const provider = await UniversalProvider.init({
  logger: "info",
  relayUrl: "ws://<relay-url>",
  projectId: "12345678",
  metadata: {
    name: "React App",
    description: "React App for WalletConnect",
    url: "https://walletconnect.com/",
    icons: ["https://avatars.githubusercontent.com/u/37784886"],
  },
  client: undefined, // optional instance of @walletconnect/sign-client
});

//  create sub providers for each namespace/chain
await provider.connect({
  namespaces: {
    eip155: {
      methods: [
        "eth_sendTransaction",
        "eth_signTransaction",
        "eth_sign",
        "personal_sign",
        "eth_signTypedData",
      ],
      chains: ["eip155:80001"],
      events: ["chainChanged", "accountsChanged"],
      rpcMap: {
        80001:
          "https://rpc.walletconnect.org?chainId=eip155:80001&projectId=<your walletconnect project id>",
      },
    },
    pairingTopic: "<123...topic>", // optional topic to connect to
    skipPairing: false, // optional to skip pairing ( later it can be resumed by invoking .pair())
  },
});

//  Create Web3 Provider
const web3Provider = new ethers.providers.Web3Provider(provider);

Events

// Subscribe for pairing URI
provider.on("display_uri", (uri) => {
  console.log(uri);
});

// Subscribe to session ping
provider.on("session_ping", ({ id, topic }) => {
  console.log(id, topic);
});

// Subscribe to session event
provider.on("session_event", ({ event, chainId }) => {
  console.log(event, chainId);
});

// Subscribe to session update
provider.on("session_update", ({ topic, params }) => {
  console.log(topic, params);
});

// Subscribe to session delete
provider.on("session_delete", ({ id, topic }) => {
  console.log(id, topic);
});

Provider Methods

interface RequestArguments {
  method: string;
  params?: any[] | undefined;
}

// Send JSON RPC requests

/**
 * @param payload
 * @param chain - optionally specify which chain should handle this request
 * in the format `<namespace>:<chainId>` e.g. `eip155:1`
 */
const result = await provider.request(payload: RequestArguments, chain: string | undefined);

Multi-chain

const web3 = new Web3(provider);

// default chainId is the FIRST chain during setup
const chainId = await web3.eth.getChainId();

// set the default chain to 56
provider.setDefaultChain(`eip155:56`, rpcUrl?: string | undefined);

// get the updated default chainId
const updatedDefaultChainId = await web3.eth.getChainId();

Creating a provider file

Create a file under providers/universal-provider/src/providers/<NAMESPACE>.ts
Implement the IProvider interface
In the IProvider.request method, there should be a check for whether or not to run the request against the wallet or the blockchain. this.namespace.methods should only contain the methods supported by the wallet.
The rest of the methods of the class are very similar, mainly centering around httpProvider and for the most part will be 90% similar to other providers given similar structure of chainId. For example eip155:1 or solana:mainnetBeta.
Export provider under providers/universal-provider/src/providers/index.ts

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