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Autonomous Ai agentic payment system. The term x402 refers to an open payment protocol for AI agents, not an Anthropic model name. [1, 2, 3] Anthropic's large language models are named in a sequence such as Claude 1, Claude 2, Claude 3 (Haiku, Sonnet, Opus), and the most recent Claude 4 family (Sonnet 4.5, Opus 4.1, Haiku 4.5). [4, 5] The x402 Protocol The x402 protocol was developed by Coinbase and other companies (including Cloudflare, Google, and Anthropic) to enable AI agents to autonomously make micropayments for web services, APIs, and data using stablecoins on a blockchain . • Functionality: It uses the long-dormant HTTP 402 "Payment Required" status code. When an AI agent requests a paid service, the server returns an HTTP 402 status code with payment details, and the AI agent automatically settles the payment with cryptocurrency. • Integration with Claude: Anthropic has integrated the x402 protocol into its Model Context Protocol (MCP) standard, which allows Claude-based AI agents to automatically handle these payment transactions when accessing external tools and data. • Purpose: The protocol aims to create a "machine-to-machine" or "agentic" economy where AI agents can seamlessly interact with and pay for a wide range of services without human intervention. [1, 2, 3, 6] In summary, the "x402" is a payment mechanism that some Claude AI agents can use, not a version or model of Claude itself. [1, 3] AI responses may include mistakes. [1] https://www.chaincatcher.com/en/article/2215325 [2] https://finance.yahoo.com/news/coinbase-links-ai-crypto-payments-013239320.html [3] https://www.bitget.com/news/detail/12560605033310 [4] https://www.datastudios.org/post/all-claude-ai-models-available-in-2025-full-list-for-web-app-api-and-cloud-platforms [5] https://docs.claude.com/en/docs/intro [6] https://medium.com/@Scoper/overview-coinbases-x402-standard-99aeeb6f6f21