Mantle deeply integrates with the x402 protocol to jointly build a new AI-driven payment infrastructure
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Mantle deeply integrates with the x402 protocol to jointly build a new AI-driven payment infrastructure
The two parties will jointly build a next-generation payment infrastructure that supports real-time settlement, chain-agnostic interoperability, and verifiable privacy.
Navigating Web3 tides with focused insightsMantle Network has officially announced a deep technical integration with the x402 protocol to jointly advance the development of a high-performance, autonomous payment network for the machine economy. This integration represents not only a key strategic move by Mantle in the fields of AI and payments but also underscores its clear vision of becoming the core layer for value transfer in the next-generation internet.
By combining x402’s native payment protocol with Mantle’s high-performance modular Layer2 architecture, the two parties will co-develop next-generation payment infrastructure that supports real-time settlement, chain-agnostic interoperability, and verifiable privacy.
Since its launch by Coinbase in May 2025, the x402 protocol has redefined the mode of value exchange between machines through its innovative "HTTP 402 Payment Required" mechanism. To date, its ecosystem has made a critical transition from meme-driven to infrastructure-driven growth, gaining support from leading institutions such as a16z, Visa, and Google. As a strategic participant, Mantle Network views x402 as a core component of its AI and RWA strategy, and will commit technological, financial, and ecosystem resources to drive x402's evolution from a multi-chain protocol into a global payment standard powering the agentic economy. This collaboration demonstrates Mantle’s strong commitment to an AI-driven future and lays a solid foundation for building a seamless, full-scenario liquidity hub connecting Web2 and Web3.
Overview of the x402 Protocol Core Mechanism
x402 is an open, chain-agnostic standard protocol that deeply integrates blockchain payment processes with the HTTP protocol. Its workflow is as follows: when a client (e.g., an AI Agent) sends a resource request, if payment has not been completed, the server returns an HTTP 402 status code along with structured JSON data in the response body, including information such as the maximum required amount (maxAmountRequired), payee address (payTo), and asset contract address (e.g., USDC). The client then generates a payment authorization using EIP-712 signatures. After the server verifies this authorization, it broadcasts and settles the transaction, enabling end-to-end automated payments.
High Compatibility Between Mantle's Architecture and x402
Mantle’s modular design and high-performance components provide a robust foundation for the operation of the x402 protocol in high-frequency, real-time, and trusted environments:
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Native USDC and EIP-3009 Support: Mantle has integrated native USDC and fully supports the EIP-3009 standard, providing a stable and compliant payment asset base for the x402 ecosystem while reducing the technical barriers to protocol integration.
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Zero-Knowledge Proofs for Enhanced Security and Compliance: Through ZKP capabilities provided via collaboration with Succinct SP1, Mantle can offer verifiable state proofs for the x402 payment authorization process, enhancing fraud prevention and providing a technical basis for compliance audits.
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Preconfs Deliver Millisecond Finality: Mantle’s unique pre-confirmation mechanism enables millisecond transaction finality for x402 in high-throughput scenarios—such as bank-grade transfers and AI-driven decision payments—far surpassing traditional L2 networks and fully meeting AI Agents’ stringent requirements for instant finality.
In addition, Mantle’s future high-performance execution layer based on reth will further enhance network processing capacity, offering potential support for thousands of TPS in batch micropayment scenarios targeted by the x402 protocol. These technical features collectively form Mantle’s differentiated advantages within the x402 ecosystem: Preconfs accelerate payment flows, ZKPs ensure trustworthy verification, and multi-asset support expands application boundaries.
Mantle's Technical Roadmap for Evolving the x402 Ecosystem – According to Raymond @raymond.cheng, Tech Lead:
To continuously optimize the performance and security of the x402 protocol in real-world applications, Mantle proposes the following key evolutionary directions:
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Development of Universal Authorization Contracts: Addressing the current lack of EIP-3009 support in most ERC-20 tokens, Mantle will launch dedicated authorization contracts to expand the usability of general-purpose tokens within x402 workflows, introducing configurable time limits, amount caps, and frequency restrictions to strengthen risk control.
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Optimization of Facilitator Services: Leverage Preconfs to improve success rates and response efficiency for large transactions; for small, high-frequency transactions, introduce a guarantee-based optimistic batch settlement mechanism to significantly enhance user experience.
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Building Chain-Agnostic x402 Experiences: Mantle plans to launch a Facilitator Aggregator service that intelligently recommends optimal payment paths based on users’ on-chain environments and needs, improving the unified x402 experience across multi-chain ecosystems and reducing fragmentation.
Mantle: The Ideal “Liquidity Layer” for x402 Evolution
Mantle’s strategic development closely aligns with three major trends—banking-grade infrastructure, AI-driven economies, and real-world assets (RWA)—making it highly compatible with x402’s trajectory toward universal payment adoption. As x402 expands across more blockchain networks, Mantle—with its Preconfs, diverse high-quality on-chain assets (such as mETH, cmETH, fbTC, USDe, etc.), and growing liquidity—will become a key enabler of x402’s vision of supporting “any asset.”
In the future, AI Agents operating on Mantle will be able to autonomously complete data purchases or RWA transactions via the x402 protocol at extremely low cost (e.g., 0.002 USDe), while simultaneously earning yield on their assets during the payment process. This scenario will redefine the boundaries of capital efficiency and payment experience, further solidifying Mantle’s position as a “Web3 liquidity hub” and advancing its evolution from a crypto-native platform into a full-scenario liquidity infrastructure connecting Web2 and Web3.
Mantle Senior Advisor Emily Shares Her Perspective and Expectations on x402 on Mantle:
The deep integration between the x402 protocol and Mantle Network is not just a powerful convergence of technology stacks, but a crucial step toward building the future autonomous economic system. Through continuous technological innovation and ecosystem development, Mantle is driving x402 from market hype toward mass commercial adoption, offering developers and enterprises a high-speed pathway to next-generation AI-powered payments. We welcome global developers to explore the infinite possibilities of the x402 protocol on Mantle through integrated platforms like QuestFlow—we are ready to lead the next wave of Web3 innovation.
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