ERC-5189 introduces a new framework for formatting and transmitting data, optimizing how developers handle and engage with crypto and digital assets on the blockchain. Co-authored by members of the Sequence team Agustín Aguilar, Philippe Castonguay, and Michael Standen, ERC-5189 offers an alternate proposal to ERC-4337.

Along with a dedicated page, the team also released a demo and has made the code open-source for developers to test and explore. This article aims to shed light on this new proposal to advance experimentation and discussion within the web3 developer community, improve existing account abstraction standards, and push the ecosystem forward.

Understanding ERC-5189 by Sequence

What is ERC-5189?

ERC-5189 is a ready-to-use decentralized mempool. In a blockchain transaction, a mempool, or memory pool, is a list of pending transactions waiting for validation from a node before it is committed to a block on the blockchain. This is similar to using "Staging" environments in traditional software development to perform testing and quality control before releasing to production. 

ERC-5189 proposes a form of account abstraction that ensures compatibility with existing smart contract wallets. It provides flexibility for alternative designs while avoiding changes to the consensus layer on the blockchain, making it cheaper, more powerful, convenient, and accessible for developers.  

This proposal introduces the concept of endorser contracts as an alternative to the current structure for AA transactions aligned with the current ERC-4337 format. ERC-5189 moves all of the “meta-logic” associated with transactions to independent contracts called endorsers.

Endorser contracts are specific smart contract instances designed to assess the quality of AA transactions. Their evaluation helps bundlers decide whether to retain or discard a transaction in the mempool. They’re never called on-chain, during a transaction, and are free to use.

Off-Chain vs On-Chain Explained

To ensure compatibility with this ERC standard, developers integrating their smart contract wallets must either create and deploy an endorser contract or utilize an existing one that aligns with their wallet's specifications. This approach enhances transaction reliability and streamlines integration without imposing a strict transaction framework. 

ERC-5189 doesn’t change the consensus layer or impose changes on existing smart contract wallets, so developers have no backward compatibility issues and benefit from more flexible design mechanics — and are met with a broader range than competing AA standards.

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Key features of ERC-5189

ERC-5189 achieves the primary goal of account abstraction, allowing users to relay smart contract wallet transactions using a decentralized mempool.

ERC-5189 unlocks the potential of zero-cost account abstraction with:

1. Simpler and more flexible wallets: Wallets have more freedom in how they operate. This ERC avoids restrictions on functionalities, allowing developers to build innovative features.

2. Easy adoption for existing wallets: No changes are required for existing wallets to be compatible. This ensures a smooth transition and avoids disruption for current users.

3. Reduced gas fees for users: Transaction validation happens off-chain, so users don't pay extra gas for this security measure.

4. Safer bundler operations: "Endorser" contracts validate transactions before bundlers include them, minimizing the risk of including malicious transactions.

5. Decentralized and dynamic endorser system: Anyone can create an endorser, fostering competition and innovation. Bundlers can choose reliable endorsers based on a public registry.

What is ERC-5189

Why is ERC-5189 important?

ERC-5189 enables all smart wallets to relay transactions without using a centralized relayer. It ensures smooth communication between wallet developers and mempool operators, allowing them to "understand" if the operations are “healthy” or not. While ERC-5189 solves the same challenges as ERC-4337, it proposes a framework with different trade-offs.

Agustín Aguilar, Head of Research at Sequence: "ERC-5189 is a fresh take and alternative to ERC-4337 standard, aimed at keeping "blank slate" freedoms when building smart contract wallets. Although it requires a ​trade-off in operational simplicity for mempool operators, it maintains the adaptability needed to support both previous and current wallets, as well as facilitate the integration of future ideas."

The Future of ERC-5189 

ERC-5189 represents a significant step forward in the standardization of AA mempools. Sequence has open-sourced ERC-5189’s code for the community and continues to welcome feedback and suggestions to improve.

Developer resources to get started with ERC-5189:

• Explore their Sendify demo to send any ERC-20 token without owning any ETH with any web3 wallet
• Run a bundler using their open-source reference bundler

For users on the lookout for more detailed information and updates on ERC-5189, visit the official site and learn more here.

Why is ERC-5189 Important

More About Sequence?

Sequence is a leading all-in-one development platform for integrating web3 into games. Onboard, monetize, grow, and retain players with Sequence’s award-winning technology. From collectibles and ownable rewards to fully on-chain experiences, Sequence’s easy-to-integrate platform solves blockchain complexities, so developers can focus on creative execution and delivering amazing player experiences.

Trusted by hundreds of games and thousands of developers. Sequence is backed by Take-Two Interactive, Ubisoft, Xsolla, Bitkraft, Brevan Howard, Coinbase, Polygon, and more. This article was inspired by an original blog post, you can read the original write-up here for more information.