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5.1.3 • Public • Published

Experimental Playground

This package is a collection of quick little ideas, which may be half-baked.

If you find a particular feature piques your interest, please feel free to open an issue on GitHub to discuss it.

Also, if you have any system that requires an object from this package, make sure you specify the exact npm version in your package.json, as backwards compatibility is NOT guaranteed for this pacakge; APIs may change and classes may disappear.



In general, a Brain Wallet is not recommended, but it is a fature we offered in v3 and below. It allows a wallet to be described and recovered using a username and a password. However, anyone who can guess a username and password can steal the funds, and the password cannot be changed. But for backwards compatibility and for simple testing, we provide it here.

import { BrainWallet } from "@ethersproject/experimenatl/brain-wallet";

// This is optional, but since a Brain Wallet can take 5-10s to generate,
// helps keep your users informed
function showProgress(percent) {
    if (percent === 1) {
    } else {
        console.log("Completed: " + Math.trunc(100 * percent) + "%");

// Generate a legacy-compatible Brain Wallet
BrainWallet.generateLegacy(username, password, showProgress).then((wallet) => {

// Generate a new-style Brain Wallet, which contains a Mnemonic Phrase too
BrainWallet.generate(username, password, showProgess).then((wallet) => {


import { NonceManager } from "@ethersproject/experimenatl/nonce-manager";

let signer = "... any way you get a signer ...";

// The NonceManager Signer will automatically manage the nonce for you
// so you may blast the network with as many transactions as you would
// like. Transactions which have not been mined within XXX timeout and
// will be rebroadcast; keep in mind that unmined transactions remain
// in memory.
let managedSigner = new NonceManager(signer);


import { RetryProvider } from "@ethersproject/experimental/retry-provider";

let provider = "... any way you get a signer...";

// All options are optional
let options = {

let retryProivder = new RetryProvider(provider, options);


GsnSigner is a special type of signer that forwards signed transactions to the Gas Station Network relayers to be submitted to the ethereum network, allowing accounts to interact with contracts without paying for gas fee.

import { ethers } from "ethers";
import { GsnSigner } from "@ethersproject/experimental";

const provider = new ethers.providers.InfuraProvider('rinkeby');

// All options are optional
let options = {

const wallet = ethers.Wallet.createRandom().connect(provider);
const signer = new GsnSigner(wallet, options);
const contractAddress = "0x7d6bea40FD170B2cF3caA101f908545E4991a3a8";
const abi = ["function setValue(uint256 val) public payable"];
const contract = new ethers.Contract(contractAddress, abi, signer);
const tx = await contract.setValue(value);


MIT License.



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