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The Autonomous Payment Protocol

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Project Overview

x402 is an autonomous payment protocol that supports AI, websites, and applications to automatically send and receive payments, provides programmable settlement and multi-chain compatibility, and is committed to building automated decentralized payment solutions.

Event-related news

Nansen Launches Pay-Per-Call Model, Enabling Instant On-Chain Data Access via x402

Odaily News Nansen has announced the introduction of a pay-per-call model, optimizing on-chain data access based on the x402 protocol and PayAI infrastructure. This model allows users to instantly query wallet data, fund flows, and "smart money" signals through USDC micropayments, eliminating the need for subscriptions, approvals, or API keys. The system automates the "request-billing-payment-return" process based on the HTTP 402 mechanism, supporting autonomous calls and payments by AI agents.Nansen stated that the new model already covers its entire API ecosystem, with basic data queries priced at approximately $0.01 per call and advanced signals at around $0.05, supporting settlement on the Base and Solana networks. (Crowdfundinsider)

Coinbase Incubated x402 Protocol Launches AI Agent App Store Agent.market

Odaily News The x402 protocol, incubated by Coinbase, has announced the launch of a unified platform called Agent.market, positioned as an "AI Agent App Store" for centrally showcasing and integrating various tools and services built on the protocol. According to the introduction, Agent.market already covers seven major categories at launch: inference, data, media, search, social, infrastructure, and trading. It integrates service providers including OpenAI, Bloomberg, CoinGecko, LinkedIn, X, and AWS Lambda, and supports permissionless integration.Erik Reppel, Engineering Lead at Coinbase Developer Platform, stated that the platform is essentially "an app store for agents." Currently, there are approximately 69,000 active agents on the x402 network, which have cumulatively completed over 165 million transactions, with a transaction volume reaching $50 million. Most services on Agent.market adopt a pay-per-use model, with some charging an "agentic premium" for AI agents. However, costs can be reduced through subscriptions in high-frequency usage scenarios. Meanwhile, the "agent economy" based on x402 is lowering customer acquisition and integration costs for businesses, unlocking previously constrained demand due to API keys, subscriptions, and micro-payment mechanisms.The x402 protocol is named after the HTTP 402 "Payment Required" status code, enabling websites, APIs, and AI agents to conduct instant micropayments via blockchain and traditional payment channels. The protocol is governed as an open standard by the x402 Foundation under the Linux Foundation and has received support from over 20 technology and crypto institutions including Cloudflare, Stripe, Amazon Web Services, Google, and Visa. (The Block)

B.AI’s Bank of AI and PKUBA jointly release the first Web4.0 research report: focusing on AI Agent economic infrastructure and real-world implementation cases

Bank of AI has partnered with Peking University’s Blockchain Association (PKUBlockchain) to release its inaugural research report, “Web4.0: When AI Agents Become Economic Actors—Infrastructure Gaps, Industry Landscape, and Investment Outlook,” officially published today. The report systematically outlines infrastructure gaps across three layers: the x402 payment protocol, the ERC-8004 identity standard, and the MCP tool-calling protocol. It further analyzes how Bank of AI integrates five core components into a one-stop Agent Financial Operating System—a representative case bridging protocols to real-world products. The report notes that TRON’s blockchain supports over $22 billion in daily transaction volume and $86 billion in circulating USDT, providing a scalable foundation for AI Agents’ high-frequency micro-settlements. Both parties will continue advancing the synergistic development of Web4.0 infrastructure and the agent-driven economy.

Related news

Jesse Pollak: AI Agents Are the Next Wave of Crypto Payments

Jesse Pollak, head of the Base chain, stated in an interview that AI agents are rapidly gaining autonomy and increasingly require native, programmable payment systems. Currently, approximately $48 million in payments have flowed through the x402 protocol, with about 95% of transactions occurring on the Base network. Jesse Pollak pointed out that x402, an open-source payment protocol co-developed by Coinbase in collaboration with Microsoft, Google, and Mastercard, enables on-demand API payments without the need for traditional subscription systems. Crypto infrastructure allows AI agents to move funds globally, instantly, and at low cost to pay for services such as data access, computation, or travel bookings. The long-term vision is to create an open service marketplace where software can discover and purchase digital services in real-time without human intervention.

Nansen Launches Pay-Per-Call Model, Enabling Instant On-Chain Data Access via x402

Odaily News Nansen has announced the introduction of a pay-per-call model, optimizing on-chain data access based on the x402 protocol and PayAI infrastructure. This model allows users to instantly query wallet data, fund flows, and "smart money" signals through USDC micropayments, eliminating the need for subscriptions, approvals, or API keys. The system automates the "request-billing-payment-return" process based on the HTTP 402 mechanism, supporting autonomous calls and payments by AI agents.Nansen stated that the new model already covers its entire API ecosystem, with basic data queries priced at approximately $0.01 per call and advanced signals at around $0.05, supporting settlement on the Base and Solana networks. (Crowdfundinsider)

Coinbase Incubated x402 Protocol Launches AI Agent App Store Agent.market

Odaily News The x402 protocol, incubated by Coinbase, has announced the launch of a unified platform called Agent.market, positioned as an "AI Agent App Store" for centrally showcasing and integrating various tools and services built on the protocol. According to the introduction, Agent.market already covers seven major categories at launch: inference, data, media, search, social, infrastructure, and trading. It integrates service providers including OpenAI, Bloomberg, CoinGecko, LinkedIn, X, and AWS Lambda, and supports permissionless integration.Erik Reppel, Engineering Lead at Coinbase Developer Platform, stated that the platform is essentially "an app store for agents." Currently, there are approximately 69,000 active agents on the x402 network, which have cumulatively completed over 165 million transactions, with a transaction volume reaching $50 million. Most services on Agent.market adopt a pay-per-use model, with some charging an "agentic premium" for AI agents. However, costs can be reduced through subscriptions in high-frequency usage scenarios. Meanwhile, the "agent economy" based on x402 is lowering customer acquisition and integration costs for businesses, unlocking previously constrained demand due to API keys, subscriptions, and micro-payment mechanisms.The x402 protocol is named after the HTTP 402 "Payment Required" status code, enabling websites, APIs, and AI agents to conduct instant micropayments via blockchain and traditional payment channels. The protocol is governed as an open standard by the x402 Foundation under the Linux Foundation and has received support from over 20 technology and crypto institutions including Cloudflare, Stripe, Amazon Web Services, Google, and Visa. (The Block)

B.AI’s Bank of AI and PKUBA jointly release the first Web4.0 research report: focusing on AI Agent economic infrastructure and real-world implementation cases

Bank of AI has partnered with Peking University’s Blockchain Association (PKUBlockchain) to release its inaugural research report, “Web4.0: When AI Agents Become Economic Actors—Infrastructure Gaps, Industry Landscape, and Investment Outlook,” officially published today. The report systematically outlines infrastructure gaps across three layers: the x402 payment protocol, the ERC-8004 identity standard, and the MCP tool-calling protocol. It further analyzes how Bank of AI integrates five core components into a one-stop Agent Financial Operating System—a representative case bridging protocols to real-world products. The report notes that TRON’s blockchain supports over $22 billion in daily transaction volume and $86 billion in circulating USDT, providing a scalable foundation for AI Agents’ high-frequency micro-settlements. Both parties will continue advancing the synergistic development of Web4.0 infrastructure and the agent-driven economy.