In this article, I will be highlighting the Best ERC-4337 APIs for Smart Account Development in 2026. We will be taking a closer look at top infrastructures like Infura, Moralis, thirdweb, Biconomy, Alchemy, Safe, Stackup, ZeroDev and OpenZeppelin Defender, evaluating each one’s set of features and benefits, limitations and shortcomings, underlying infrastructure and development capabilities in order to determine which one is best suited for your smart account development needs.
Why Choose ERC-4337 APIs for Smart Account Development
Gasless Transactions: The paymaster functionality could be used to create sponsored transactions.
Smoother User Onboarding: Users would not have to struggle with the complexity of wallets and gas payments.
Programmable Wallets: Smart accounts could be used to implement custom authorization, spending limits, transaction settlement rules, and recovery logic.
Safer Infrastructure: Managed bundlers, paymasters, RPC nodes, and API access help you avoid rolling your own account abstraction infrastructure.
Batching of Transactions: Multiple operations could be combined into one or several blockchain transactions, thus reducing the number of interactions with the blockchain for end-users.
Multi-chain Applications: Most of our partners support Ethereum-compatible chains, so you can build apps that span multiple ecosystems.
Faster Development: SDKs, APIs, documentation, and infrastructure would let you adopt smart account functionality in less time.
Scalable Web3 Applications: Your app would be able to process more and more UserOperations without having to roll your own account abstraction layer.
Better UX for Web3 Apps: End-users would not have to deal with the complexity of account abstraction and could enjoy a more pleasurable experience, similar to the one they know from Web2 apps.
More Secure Software Wallets: Smart accounts could implement authorization logic and spending limits, be owned by multiple signers, have settlement rules, and more. This would let you create safer digital financial platforms.
Greater Innovation for Blockchain Apps: Account abstraction would let you design Web3 apps that are way more sophisticated than the existing ones.
Key Features Of ERC-4337 APIs for Smart Account Development
| Key Feature | What It Provides | Why It Matters for Smart Account Development |
|---|---|---|
| UserOperation Support | Enables applications to create and submit UserOperations instead of traditional transactions. | Simplifies smart account transaction flows and improves wallet flexibility. |
| Bundler Infrastructure | Collects UserOperations and submits them for on-chain execution. | Removes the need to build and maintain custom bundler infrastructure. |
| Paymaster Support | Allows applications to sponsor gas fees or offer alternative payment methods. | Enables gasless transactions and improves user onboarding. |
| Smart Account Creation | Provides tools and SDKs for deploying or managing ERC-4337 smart accounts. | Reduces development time and simplifies wallet integration. |
| Gas Abstraction | Handles gas sponsorship, estimation, and transaction-fee workflows. | Creates a smoother experience for users unfamiliar with blockchain gas fees. |
| Transaction Batching | Combines multiple actions into a single smart-account operation. | Reduces unnecessary wallet confirmations and can improve efficiency. |
| Multi-Chain Support | Provides ERC-4337 infrastructure across multiple compatible networks. | Helps developers deploy smart-account applications across different ecosystems. |
| SDK & API Integration | Offers libraries, APIs, and developer tools for integrating account abstraction. | Makes implementation faster and reduces the amount of custom blockchain code. |
| Security & Access Controls | Supports permissions, transaction policies, and secure smart-account management. | Helps protect assets and control how smart accounts execute transactions. |
| Monitoring & Analytics | Provides transaction tracking, logs, and operational visibility. | Helps developers troubleshoot, monitor, and optimize smart-account activity. |
| Wallet Recovery & Programmability | Enables customized account logic, permissions, recovery, and spending rules. | Makes smart accounts more flexible than traditional externally owned accounts. |
| Scalability & Reliability | Provides managed infrastructure for high-volume UserOperations and transactions. | Helps applications handle growing users and transaction demand without managing all infrastructure themselves. |
Key Point & Best ERC-4337 APIs for Smart Account Development
- Infura AA API – Reliable Ethereum infrastructure with smart account and ERC-4337 support.
- Moralis AA SDK – Simplifies smart account integration with APIs, SDKs, and blockchain data tools.
- thirdweb AA API – Developer-friendly toolkit for building ERC-4337 smart wallets and account abstraction apps.
- Ankr AA API – Provides scalable Web3 infrastructure for smart account and blockchain applications.
- Biconomy – Offers modular account abstraction infrastructure with smart accounts, paymasters, and bundler services.
- Alchemy AA SDK – Provides developer tools for building ERC-4337 smart accounts, bundlers, and gas sponsorship.
- Safe (formerly Gnosis Safe) – Secure smart account infrastructure focused on multisig, programmable ownership, and asset management.
- Stackup – ERC-4337 infrastructure offering bundlers, paymasters, and developer tools for account abstraction.
- ZeroDev – Modular smart account development platform with ERC-4337 support, plugins, and account management.
- OpenZeppelin Defender AA – Security-focused infrastructure for managing smart accounts, transactions, and automated Web3 operations.
10 Best ERC-4337 APIs for Smart Account Development 2026
1. Infura AA API
Infura AA API is a service that aims to abstract away the complexity of connecting your smart account application to a blockchain, using the ERC-4337 standard. The service offers API access to Ethereum blockchain so that developers can interact with smart accounts, UserOperations, and other account abstraction-related entities without having to operate their own node.
With Infura you can build scalable web3 apps with reduced backend complexity. If you are looking for the Best ERC-4337 APIs for Smart Account Development, it is worth considering this service, as it provides all the infrastructure you need to operate your account abstraction-based solution on the Ethereum blockchain.
Moreover, the service can be used to deploy various types of applications including wallets, DeFi solutions, games, and other blockchain-based apps that require a reliable connection to the Ethereum blockchain.
Features of Infura AA API
- ERC-4337 smart account infrastructure support
- Reliable blockchain RPC connectivity
- UserOperation submission and transaction handling
- Scalable Web3 infrastructure for applications
- Developer APIs and integration tools
| Pros | Cons |
|---|---|
| Reliable blockchain infrastructure | Advanced features may require deeper technical knowledge |
| Strong Ethereum ecosystem | Pricing can increase with usage |
| Scalable RPC infrastructure | Account-abstraction features may vary by network |
| Suitable for production applications | Less focused on end-user wallet UX |
| Established developer tooling | Can be more infrastructure-oriented than turnkey AA platforms |
2. Moralis AA SDK
Moralis AA SDK allows developers to integrate smart accounts and account-abstraction features into their Web3 applications while leveraging the Moralis platform’s broader blockchain development ecosystem.
It can help reduce the amount of backend code needed for working with wallets, transactions, token balances, smart account operations, and more.
For developers looking to make the Best ERC-4337 APIs for Smart Account Development, Moralis can be a great solution for abstracting account management over broader Web3 APIs and tools.
This can be useful in contexts where smart wallets are used alongside blockchain data, authentication, portfolio management, and transaction operations.
Features of Moralis AA SDK
- Smart account and ERC-4337 development support
- Developer-friendly SDK and APIs
- Blockchain data and wallet APIs
- Token and transaction data integration
- Multi-chain Web3 application support
| Pros | Cons |
|---|---|
| Developer-friendly SDKs | Broad platform can add complexity |
| Combines AA with blockchain data APIs | Pricing depends on usage and plan |
| Useful for multi-chain applications | Developers should verify current AA network support |
| Simplifies blockchain integration | May provide more features than a simple AA project needs |
| Strong Web3 development ecosystem | Some advanced customization may require additional development |
3. Thirdweb AA API
The thirdweb AA API provides infrastructure for building smart wallets and account-abstraction experiences on top of. Developers can rely on the thirdweb platform to handle complex operations involved in wallets development and instead focus on building the rest of the application layer around it.
Smart accounts offer the ability to implement sponsored transactions, programmable transaction batching, and better UX than what is possible with standard externally owned accounts.
Of the Best ERC-4337 APIs for Smart Account Development, the thirdweb is the preferred choice for teams that want to build an integrated developer platform as opposed to relying on a combination of different infrastructure providers. It is ideal for developers looking to build gaming, NFT, consumer web3, and applications focused experiences.
Features of thirdweb AA API
- Smart wallet development tools
- ERC-4337 account abstraction support
- Gas-sponsored transaction capabilities
- SDKs for simplified Web3 integration
- Tools for gaming, NFT, and consumer dApps
| Pros | Cons |
|---|---|
| Easy smart-wallet integration | Platform abstraction can limit some low-level customization |
| Developer-friendly SDKs | Costs can vary by usage and services |
| Supports gas-sponsored experiences | Developers need to understand supported networks |
| Useful for gaming and consumer dApps | Broad platform may be excessive for infrastructure-only projects |
| Simplifies Web3 application development | Feature availability can change across releases |
4. Ankr AA API
Ankr AA API offers blockchain infrastructure for developing scalable decentralized apps based on account-abstraction technologies. The provider’s RPC connectivity and Web3 developer services allow developers to reduce operational expenses associated with maintaining an independent blockchain infrastructure.
The service may be a viable solution for the Best ERC-4337 APIs for Smart Account Development list if scalable blockchain infrastructure is required to ensure reliable operations. Ankr’s infrastructure is appropriate for apps that require reliable blockchain connectivity to support smart-account implementation and operation.
Developers should consider ERC-4337 features, supported networks, and available APIs to determine whether the provider meets their production-grade needs.
Features of Ankr AA API
- Scalable blockchain infrastructure
- RPC endpoints for supported networks
- Web3 developer APIs and infrastructure tools
- Account-abstraction integration capabilities
- Infrastructure designed for high-traffic applications
| Pros | Cons |
|---|---|
| Scalable Web3 infrastructure | AA capabilities may be less specialized than dedicated providers |
| Broad blockchain connectivity | Developers should verify current ERC-4337 support |
| Established RPC infrastructure | Pricing varies according to usage |
| Suitable for high-traffic applications | May require additional components for complete AA workflows |
| Useful for multi-chain development | Documentation can require technical understanding |
5. Biconomy
Biconomy is one of the leading account-abstraction infrastructure providers that make Web3 apps user-friendly through smart accounts, transaction sponsorship, and modular account-abstraction components.
The ecosystem underlines the best ERC-4337 APIs for smart account development because this provider mainly focuses on developing account abstraction solutions for application developers. It offers a wide range of possibilities like gasless transactions, paymasters,
UserOperations, and programmable transaction experiences. Biconomy’s modular approach helps developers build more powerful and customizable transaction experiences for users, making it a great choice for DeFi, gaming, and other Web3 app development spaces.
Features of Biconomy
- ERC-4337 smart accounts
- Bundler and paymaster infrastructure
- Gasless and sponsored transactions
- Modular account-abstraction architecture
- Programmable transaction experiences
| Pros | Cons |
|---|---|
| Strong focus on account abstraction | Advanced architecture can increase implementation complexity |
| Smart accounts and paymasters | Costs depend on infrastructure usage |
| Supports gas-sponsored transactions | Developers need to understand ERC-4337 concepts |
| Modular and programmable architecture | Network and feature availability should be checked |
| Well suited for consumer Web3 applications | Some advanced configurations require additional development |
6. Alchemy AA SDK
Alchemy AA SDK serves as the developer infrastructure for building account abstraction and smart-wallets on the supported chains.
It offers a convenient way to interact with all the relevant Ethereum ERC-4337 entities, including smart accounts, bundlers, paymasters, and UserOperation.
Alchemy allows developers to build apps without having to design and maintain an entire account-abstraction layer themselves. Inside the Best ERC-4337 APIs for Smart Account Development ranking,
Alchemy takes the top spot for the teams that want to leverage the mature RPC, blockchain data, and developer infrastructure to build their own wallets, DeFi protocols, and consumer Web3 apps on the smart account abstraction layer.
Features of Alchemy AA SDK
- ERC-4337 smart account development
- Bundler infrastructure
- Paymaster and gas sponsorship support
- UserOperation management
- Scalable RPC and Web3 infrastructure
| Pros | Cons |
|---|---|
| Comprehensive ERC-4337 infrastructure | Can be more complex for beginners |
| Bundler and paymaster support | Usage-based costs may apply |
| Strong RPC and developer infrastructure | Features vary across supported networks |
| Good scalability for production apps | Developers may depend heavily on Alchemy infrastructure |
| Extensive developer ecosystem | Advanced customization can require deeper technical knowledge |
7. Safe (formerly Gnosis Safe)
Safe offers smart-account infrastructure underpinned by secured asset management, programmable ownership, and transaction approval. The platform was previously known as Gnosis Safe. It is among the best options for multisignature and organizational treasury management.
The Safe smart account provides an advanced solution that allows multiple initiators or defined policies to manage blockchain assets. Considering the Best ERC-4337 APIs for Smart Account Development, Safe stands out as an appropriate option for those who want to benefit from smart contract technology with a particular emphasis on security, governance, or transaction control.
The platform can be applied for DAOs, treasuries, Web3 companies, or businesses. Notably, when choosing between various smart-account infrastructure providers, one has to keep in mind that Safe focuses on institutional-level management unlike some competitors that offer more consumer-oriented ERC-4337 blockchain wallet solutions.
Features of Safe (formerly Gnosis Safe)
- Programmable smart accounts
- Multisignature transaction approvals
- Secure digital asset management
- Role-based ownership and permissions
- DAO and institutional treasury support
| Pros | Cons |
|---|---|
| Strong smart-account security model | Primarily known for multisig and asset management |
| Multisignature transaction support | Can be more complex than simple wallets |
| Excellent for DAOs and organizations | User experience may require additional integration |
| Programmable ownership and permissions | Not every consumer use case needs multisig functionality |
| Established smart-account ecosystem | Developers should distinguish Safe features from general ERC-4337 tooling |
8. Stackup
Stackup offers infrastructure solutions for ERC-4337 and account abstraction, including the relevant tools needed so that developers do not have to build everything from scratch when launching smart-account applications.
The ecosystem within Stackup has already built bundler and paymaster infrastructure needed for the creation and support of UserOperations. When seeking the Best ERC-4337 APIs for Smart Account Development, it is helpful to consider Stackup due to their specialization and support for the account abstraction ecosystem and the relevant ERC-4337 infrastructure.
Stackup can be leveraged by development teams to begin building their own wallets, dApps, and other applications that interact with smart accounts. Prior to committing to the infrastructure provider, it is essential to evaluate the supported chains, available APIs, pricing details, and the specific ERC-4337 elements offered by the provider.
Features of Stackup
- ERC-4337-focused infrastructure
- Bundler services
- Paymaster functionality
- UserOperation processing
- Developer tools for account abstraction
| Pros | Cons |
|---|---|
| Strong ERC-4337 specialization | Smaller ecosystem than some major infrastructure providers |
| Bundler infrastructure | Developers should verify current service availability |
| Paymaster support | Advanced implementations require technical knowledge |
| Designed specifically for account abstraction | Network coverage should be evaluated for each project |
| Useful for developers building AA infrastructure | May require additional services for a complete application stack |
9. ZeroDev
ZeroDev is an account-abstraction developer platform that enables developers to build programmable smart accounts and wallet experiences. The infrastructure is built around modular smart-account architecture that lets developers attach features and modify account functionality to fit their application’s needs.
Smart accounts can be utilized across various use-cases, including transaction batching, gas sponsorship, permissions, and more depending on the features they expose.
ZeroDev is one of the Best ERC-4337 APIs for Smart Account Development that provide developers with a flexible and programmable smart-wallet infrastructure. In addition, it can be used to build DeFi, gaming, automation, and consumer apps that could not be possible with standard wallets.
Features of ZeroDev
- Modular smart account architecture
- ERC-4337 account abstraction
- Programmable wallet capabilities
- Transaction batching and automation
- Gas sponsorship and paymaster integration
| Pros | Cons |
|---|---|
| Strong focus on programmable smart accounts | Modular architecture can be complex |
| ERC-4337-oriented infrastructure | Advanced features may require deeper development knowledge |
| Flexible account customization | Pricing depends on selected services and usage |
| Supports sophisticated wallet experiences | Developers should verify current chain support |
| Useful for DeFi and automated applications | May be more advanced than needed for simple wallet projects |
10. OpenZeppelin Defender AA
OpenZeppelin Defender AA is a universal account abstraction concept which combines Open Zeppelin’s security and general smart-contract development ecosystem. The tool is intended for organizations which seek to build secured infrastructure and have the relevant operation tools for smart accounts and transactions.
Open Zeppelin is a renowned developer of smart contract libraries and security-focused solutions. As such, the organization’s products are highly relevant for those who want to implement transaction control, use smart contracts, and develop high-level applications on top of the blockchain infrastructure.
Thus, Open Zeppelin is one of the most compelling choices for organizations which want to build ERC-4337-compliant smart account solutions. The company’s tools are great in terms of security, automation, management, and accessibility, making them an excellent choice for professional Web3 teams.
Features of OpenZeppelin Defender AA
- Smart account infrastructure
- Transaction automation and management
- Access control and security features
- Smart-contract development ecosystem
- Operational tooling for production Web3 applications
| Pros | Cons |
|---|---|
| Strong security-oriented ecosystem | Can be complex for beginners |
| OpenZeppelin smart-contract tooling | More enterprise-focused than some lightweight solutions |
| Transaction automation capabilities | Pricing and availability depend on services used |
| Useful for production Web3 operations | Requires understanding of smart-contract security |
| Suitable for controlled and automated workflows | May require additional infrastructure for complete AA functionality |
Conclusion
ERC-4337 APIs are making smart account development more flexible, scalable, and user-friendly by introducing simplified solutions to the complicated blockchain processes like UserOperations, bundling, gas sponsorship, and programmable transactions.
The best ERC-4337 APIs for smart account development include Infura, Moralis, thirdweb, Ankr, Biconomy, Alchemy, Safe, Stackup, ZeroDev, and OpenZeppelin Defender. Each of the platforms offers unique features, making it difficult to determine which one is the best for smart account development.
Developers should consider several aspects when choosing the best ERC-4337 API for smart account development.
These aspects include networks supported, smart-account features, paymaster options, security, scalability, cost, and the availability of software development kits (SDK). The choice between the available ERC-4337 APIs for smart account development depends on the needs of the project.
FAQ
What is an ERC-4337 API?
An ERC-4337 API provides infrastructure and developer tools for building smart accounts without requiring applications to implement the entire account-abstraction stack themselves. It can support UserOperations, bundlers, paymasters, transaction sponsorship, and smart-wallet functionality.
What are the Best ERC-4337 APIs for Smart Account Development?
Some leading options include Infura AA API, Moralis AA SDK, thirdweb AA API, Ankr AA API, Biconomy, Alchemy AA SDK, Safe, Stackup, ZeroDev, and OpenZeppelin Defender AA. The best choice depends on supported chains, features, pricing, security, and development requirements.
Why use ERC-4337 for smart account development?
ERC-4337 enables more flexible wallet experiences, including gas sponsorship, transaction batching, programmable permissions, and improved onboarding. These capabilities can make Web3 applications easier for users to interact with.
What is a UserOperation in ERC-4337?
A UserOperation is a structured request that represents an intended action from a smart account. Instead of being a traditional blockchain transaction directly signed by an externally owned account, it is processed through ERC-4337 account-abstraction infrastructure.