A Typescript Library to easily build and send ERC-4337 UserOperations, with first class support for Safe Accounts.

AbstractionKit is agnostic of:

• Ethereum interface libraries: ethers, web3.js, viem/wagmi
• Bundlers: Plug and play from any bundler provider
• Paymasters: Candide Paymaster is supported , but you can use any 3rd party paymaster to sponsor gas
• Accounts: The Safe Account first class supported, but you can use use Bundlers and Paymasters with any account

Docs

For full detailed documentation visit our docs page.

Installation

npm install abstractionkit

Quickstart

Safe Account

AbstractionKit features the Safe Account. It uses the original Safe Singleton and adds ERC-4337 functionality using a fallback handler module. The contracts have been developed by the Safe Team. It has been audited by Ackee Blockchain. To learn more about the contracts and audits, visit safe-global/safe-modules.

import { SafeAccountV0_3_0 as SafeAccount } from "abstractionkit";

const ownerPublicAddress = "0xBdbc5FBC9cA8C3F514D073eC3de840Ac84FC6D31";
const smartAccount = SafeAccount.initializeNewAccount([ownerPublicAddress]);

Then you can consume accout methods:

const safeAddress = smartAccount.accountAddress;

Bundler

Initialize a Bundler with your desired bundler RPC url. Find more public bundler endpoints on our docs

import { Bundler } from "abstractionkit";

const bundlerRPC = "https://sepolia.voltaire.candidewallet.com/rpc";

const bundler: Bundler = new Bundler(bundlerRPC);

Then you can consume Bundler methods:

const entrypointAddresses = await bundler.supportedEntryPoints();

Paymaster

Initialize a Candide Paymaster with your RPC url. Get one from the dashboard.

import { CandidePaymaster } from "abstractionkit";

const paymasterRpc = "https://api.candide.dev/paymaster/$version/$network/$apikey";

const paymaster: CandidePaymaster = new CandidePaymaster(paymasterRPC);

Then you can consume Paymaster methods:

const supportedERC20TokensAndPaymasterMetadata = await paymaster.fetchSupportedERC20TokensAndPaymasterMetadata();

Guides

| Title | Description | -----------------------------------------------------------------------------------------| -------------------------------------------------------------------------------- | | Send your first user operation | Learn how to create a smart wallet and to send your first user operation | | Send a Gasless Transaction | Learn how to send gasless transactions using a paymaster | | Pay Gas in ERC-20 | Learn how to offer the ability for users to pay gas in ERC-20s using a Paymaster |

npm package

npm

License

MIT

Acknowledgments

• EIP-4337: Account Abstraction via Entry Point Contract specification
• Safe modules