Viewpoint: The x402 protocol is not equivalent to Ethereum AA account abstraction.

Author: Haotian; Source: X, @tmel0211

Last time I mentioned that the x402 protocol continues the Lightning Network, and recently while having dinner with a group of programmer friends, I was once again “challenged”: Isn't x402 just the previous AA account abstraction?

The implication is that Ethereum has been working on Account Abstraction for many years, investing a lot of resources into ERC-4337, Paymaster, and various Grants and wallet service providers. However, the results have been widely criticized as having a lot of noise but little substance.

Although I don't think AA has declared failure, what is the crux of the issue?

1. The Paymaster shifts the user's Gas consumption onto the project party, which sounds great, but the project party's ability to subsidize is weak, and the ROI is unclear. Undoubtedly, this leads to a dead end in the business model. How can it work if it relies entirely on external funding without the ability to generate its own revenue?

2. The AA account abstraction is limited to the EVM ecosystem, such as ERC4337, Paymaster, and EntryPoint contracts, which are all exclusive to Ethereum. If you want to achieve cross-EVM ecosystem usage including Solana, BTC, etc., you will need to continue adding intermediary layer services to realize the functionality. However, the problem is that the intermediary layer services introduce an additional fee division, which poses a greater challenge to the ROI of the business model!

There are still many complex technical issues, which I won't elaborate on, but to say something that everyone can understand, AA is essentially a product of “technology for the sake of technology,” a work stemming from the pure research tendency of Ethereum in the past.

In contrast, what is the x402 protocol playing at? What is the difference? Some have criticized how the HTTP 402 status code, an ancient artifact from 30 years ago, has been brought out again, along with a game featuring gold with intricate engravings.

But don't forget, the HTTP 402 status code - this is the underlying protocol of the internet, the common language between Web2 and Web3.

AA requires smart contracts, on-chain state, and EVM virtual machine execution, while x402 only needs an HTTP request header, and any system that supports HTTP can use it—Web2 APIs, Web3 RPCs, and even traditional payment gateways are all compatible.

This is not an optimization scheme for technical stacking, but rather a “dimensionality reduction strike” that simplifies the protocol layer. Instead of messing around with various compatibility adaptations and trust methods at the application layer, it is better to first unify the standards at the upstream protocol layer.

The key is that x402 is inherently a very good cross-chain interoperability standard. As long as the Agent can send HTTP requests, handle 402 responses, and complete EIP-3009 authorization (or equivalent standards on other chains), whether you are Base, Monad, Solana, Avalanche, or BSC, the cross-chain aspect at the protocol level is seamless, only reflecting in the single-point issue of settlement payments. In comparison, the cross-chain cost is much lower.

The facilitator can serve multiple chains simultaneously, allowing users' payment history data to be uniformly indexed, and developers can “connect” to the entire ecosystem with just one integration.

I overall feel that AA is a refined engineering under the mindset of researchers, while the x402 protocol is a pragmatism forced by market demand.

The question arises, will ERC-8004 follow the old path of AA?

Theoretically speaking, ERC-8004 is very similar to AA 2.0, still exclusive to EVM, requiring the deployment of a three-layer registry (Identity/Reputation/Validation). Early incentives also heavily rely on external subsidies or staking, which are pitfalls that AA has previously encountered. If other chains are to be compatible, an additional layer of trust cost must be incurred.

But the difference is that, under the x402 framework, ERC-8004 is just a tool, not a governing standard. What other chains need to be compatible with is the x402 protocol, not ERC8004.

This positioning difference is very important. What was AA's problem back then? It wanted to become “the only standard for Ethereum payment experience,” demanding the entire ecosystem to revolve around it: wallets need to adapt, applications need to integrate, and users need to change their habits. This kind of “top-down” strong push cannot be promoted naturally without killer applications and clear ROI.

Unlike ERC-8004, it does not need to be the protagonist, because x402 has already solved the most critical issue: payment. ERC-8004 merely provides an “optional” trust layer on this already functioning payment network.

Moreover, ERC-8004 rides on the coattails of x402, which does not require building an ecosystem from scratch. x402 already has a clear business loop (Provider traffic generation, Facilitator charging), a complete technology stack (HTTP protocol + EIP-3009), and an active project ecosystem; ERC-8004 only needs to be “plug and play.”