The Quack AI team has unveiled x402 BNB, described as a “unified layer for signatures, payments, and governance in the agent economy on BNB Chain.”
Today, we’re introducing x402 BNB, built by @QuackAI_AI.
The first unified sign-to-pay and governance layer for the Agent Economy on @BNBCHAIN.
Powered by EIP-7702 delegated execution, EIP-712 witness signatures, and a gas-sponsored relayer layer,
x402 BNB replaces every… pic.twitter.com/EHPVqB2ghh
— Quack AI (@QuackAI_AI) October 29, 2025
This solution allows multiple steps to be replaced with a single signature: confirmation → transfer → payment.
“BNB Chain does not lack liquidity; it lacks a unified way to move it. Most tokens still rely on outdated flows that create friction and limit scalability,” the developers stated.
x402 BNB “addresses the issue at the protocol level,” providing “gas-free one-click transactions that can be verified, checked, and controlled.”
Key features of the solution include:
- users sign once, with gas handled in parallel;
- the ability to sponsor transaction fees;
- support for batch transfers, account splitting, and automatic payments to agents.
Technical Implementation
The foundation of x402 BNB lies in two standards that “provide structure and security to the process”:
- EIP-7702 Delegated Execution — allows users to give one-time permission for a transaction to be executed on their behalf;
- EIP-712 Witness Signatures — defines the nature of the transfer: token, amount, recipient, expiration.
An intermediary combines two signatures into one operation and sponsors the gas in BNB. This creates a 0x04 type transaction, executed directly in the user’s account without additional confirmations or pop-ups.
Thanks to this solution, developers can group multiple payments, send funds to numerous recipients, and settle with several tokens—all within a single signed data package.
The solution creates the following use cases:
- automatic payments to agents;
- reward programs with multiple recipients;
- subscription renewals and service payments;
- treasury or DAO fund splitting.
“Imagine agents who can automatically renew services, conduct DAO votes, manage treasury within set limits, or split and distribute payments according to a transparent policy,” the developers’ blog states.
Back in May, Coinbase introduced an online payment tool, x402. It is designed for stablecoin transfers via standard internet protocols and allows AI agents to conduct autonomous transactions.
In October, the on-chain activity of the solution increased more than tenfold.