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SDK V4 (latest)
 * SDK V4 (latest)
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 * Overview
 * Quickstart: React
 * Quickstart: Core SDK
 * React
 * Paymaster
 * Tutorials
 * Smart Accounts
 * Bundler
 * Gas Estimations SDK
 * Dashboard
 * Modules
 * Troubleshooting
 * Contract Addresses
 * Audits
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 * Supported Networks & Tokens

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 * Overview

Version: SDK V4 (latest)
On this page


OVERVIEW

The Biconomy SDK is an Account Abstraction toolkit that enables the simplest UX
on your dApp, wallet, or appchain. Built on top of ERC 4337, we offer a
full-stack solution for tapping into the power of our Smart Accounts Platform,
Paymasters, and Bundlers.

Introduction to Account Abstraction

Account Abstraction aims to enhance user experience by making user accounts more
flexible and functional. Instead of using an Externally Owned Account, a Smart
Contract can act as your account, powered by code instead of the Elliptic Curve
Digital Signature Algorithm (ECDSA).


USEROP

A userOperation or a userOp is a data structure that describes a transaction to
be sent on behalf of a user. It is not an actual Blockchain Transaction but has
all the necessary fields to become one. These are fields like “sender,” “to,”
“calldata,” “nonce,” and more. You can find the userOp structure here.


ENTRY POINT CONTRACT

The Entry Point contract is the singleton smart contract, the core of the
Account Abstraction Flow. This singleton contract is used as an entry point to
execute bundles of userOps. Refer to this blog series for a comprehensive
understanding of the Entry Point.


SMART ACCOUNT

This smart contract acts as a user wallet where all user assets are stored. You
can program it to validate transactions before executing them. Unlike a
traditional wallet, the Smart Account cannot initiate a transaction
independently and will need a signer to help it do so.


BUNDLER

The Bundler collects, bundles, and submits userOps to an EVM network. One can
make a JSON RPC call to a bundler client to have a userOp added to an ERC 4337
mempool.


PAYMASTER

The Paymaster is a smart contract that acts as a gas tank and is used to sponsor
transactions where the dApp or another third party pays the transaction fee on
behalf of the user. The userOp contains a field for adding data about a
Paymaster and if it should sponsor the userOp when pushed on-chain to become a
transaction.

A smart account sends a userOp to execute a transaction. Bundlers then watch the
mempool for userOps and send them on-chain by calling the Entry Point contract.

Now, you have a basic understanding of the ERC 4337 flow for account
abstraction.


SMART ACCOUNTS PLATFORM

The Biconomy's Modular Smart Account is an ERC 4337-compliant solution that
works with any Paymaster and Bundler service. Biconomy Smart Accounts are signer
agnostic, which means you can use any authorization package as long as a signer
is passed to our SDK during Smart Account creation. Explore different methods
for creating Smart Accounts here.


MODULES

Modular architecture enables developers to easily & securely plug-in
programmable modules to extend smart account capabilities. These modules
leverage the power of Account Abstraction to allow for custom validation schemes
and execution environments. As a developer, this allows you to build additional
modules while leveraging existing ones like session keys, multi-chain
validation, passkeys, and beyond.

If you want to start diving into Smart Accounts you can begin here. For those,
who are already familiar with Smart Accounts and prefer to start with modules,
you can check out here or follow this step-by-step tutorial on how to build a
dApp that utilizes session key modules.

View the audit reports for smart accounts and Modules here.




BUNDLER

The Bundler is a service that tracks userOps that exist in an alternative mem
pool and as the name suggests, bundles them together to send to an Entry Point
Contract for eventual execution onchain.

This is the final piece of the flow where after constructing your userOp and
then potentially signing it with data from a paymaster, you send the userOp
on-chain to be handled and executed as a transaction on the EVM. You can start
using our Bundlers right now in your dApps. Each of our tutorials will walk you
through how to use them in different scenarios.

View the list of supported networks by Biconomy bundler here.

If you are looking to integrate account abstraction using APIs, checkout the
bundler APIs and tutorials.


PAYMASTER

Biconomy's paymaster service enables Dapps to sponsor transactions and, also
allows users to use ERC-20 tokens as payment for gas. Log in to the Biconomy
dashboard to get the paymaster URL and switch modes between our sponsorship and
token Paymaster. Make use of different Spending limits to customize the
paymaster usage.


SPONSORSHIP PAYMASTER

Enabling the Sponsored mode facilitates gasless transactions, eliminating the
necessity for users to have native tokens to cover gas fees. Learn how to set up
your paymaster here.


TOKEN PAYMASTER

Switching your Paymaster mode to ERC20 enables users to pay gas fees with ERC20
tokens across networks See the latest supported networks tokens here.

Learn how to utilize either of these Paymasters by checking out our How To Guide
on Executing transactions

Next: Checkout the quickstart guide to start the integration.

Next
Quickstart: React
 * UserOp
 * Entry Point Contract
 * Smart Account
 * Bundler
 * Paymaster
 * Smart Accounts Platform
   * Modules
 * Bundler
 * Paymaster
   * Sponsorship Paymaster
   * Token Paymaster

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