SDK 🚀

The Biconomy SDK is your all-in-one toolkit for building decentralized applications (dApps) with ERC4337 Account Abstraction and Smart Accounts. It is designed for seamless user experiences and offers non-custodial solutions for user onboarding, sending transactions (userOps), gas sponsorship and much more.

📚 Table of Contents

• SDK 🚀

  • 📚 Table of Contents

  • 🛠️ Quickstart

    • Prerequisites
    • Installation

  • 📄 Documentation and Resources

  • 💼 Examples

    • 🛠️ Initialise a smartAccount
    • 📨 send some eth with sponsorship
    • 🔢 send a multi tx and pay gas with a token

  • License

  • Connect with Biconomy 🍊

🛠️ Quickstart

Installation

1. Add the package and install dependencies:

bun add @biconomy/account viem
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2. Install dependencies:

bun i
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import { createSmartAccountClient } from "@biconomy/account";

const smartAccount = await createSmartAccountClient({
  signer: viemWalletOrEthersSigner,
  bundlerUrl: "", // From dashboard.biconomy.io
  paymasterUrl: "", // From dashboard.biconomy.io
});

const { wait } = await smartAccount.sendTransaction({ to: "0x...", value: 1 });

const {
  receipt: { transactionHash },
  success,
} = await wait();
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Documentation and Resources

For a comprehensive understanding of our project and to contribute effectively, please refer to the following resources:

• Biconomy Documentation
• Biconomy Dashboard
• API Documentation
• Contributing Guidelines: Learn how to contribute to our project, from code contributions to documentation improvements.
• Code of Conduct: Our commitment to fostering an open and welcoming environment.
• Security Policy: Guidelines for reporting security vulnerabilities.
• Changelog: Stay updated with the changes and versions

💼 Examples

Initialise a smartAccount

Key	Description
signer	This signer will be used for signing userOps for any transactions you build. Will accept ethers.JsonRpcSigner as well as a viemWallet
paymasterUrl	You can pass in a paymasterUrl necessary for sponsoring transactions (retrieved from the biconomy dashboard)
bundlerUrl	You can pass in a bundlerUrl (retrieved from the biconomy dashboard) for sending transactions

import { createSmartAccountClient } from "@biconomy/account";
import { createWalletClient, http, createPublicClient } from "viem";
import { privateKeyToAccount, generatePrivateKey } from "viem/accounts";
import { mainnet as chain } from "viem/chains";

const account = privateKeyToAccount(generatePrivateKey());
const signer = createWalletClient({ account, chain, transport: http() });

const smartAccount = await createSmartAccountClient({
  signer,
  bundlerUrl,
  paymasterUrl,
});
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Send some eth with sponsorship

Key	Description
oneOrManyTx	Submit multiple or one transactions
userOpReceipt	Returned information about your tx, receipts, userOpHashes etc

const oneOrManyTx = { to: "0x...", value: 1 };

const { wait } = await smartAccount.sendTransaction(oneOrManyTx, {
  paymasterServiceData: {
    mode: PaymasterMode.SPONSORED,
  },
});

const {
  receipt: { transactionHash },
  userOpHash,
  success,
} = await wait();
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Send a multi tx and pay gas with a token

Key	Description
buildUseropDto	Options for building a userOp
paymasterServiceData	PaymasterOptions set in the buildUseropDto

import { encodeFunctionData, parseAbi } from "viem";
const preferredToken = "0x747A4168DB14F57871fa8cda8B5455D8C2a8e90a"; // USDC

const tx = {
  to: nftAddress,
  data: encodeFunctionData({
    abi: parseAbi(["function safeMint(address to) public"]),
    functionName: "safeMint",
    args: ["0x..."],
  }),
};

const buildUseropDto = {
  paymasterServiceData: {
    mode: PaymasterMode.ERC20,
    preferredToken,
  },
};

const { wait } = await smartAccount.sendTransaction(
  [tx, tx] /* Mint twice */,
  buildUseropDto
);

const {
  receipt: { transactionHash },
  userOpHash,
  success,
} = await wait();
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License

This project is licensed under the MIT License. See the LICENSE file for details

Connect with Biconomy 🍊