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x402 Protocol Lets AI Agents Pay Autonomously, Clearing Over 115 Million Microtransactions Across Web Infrastructure
The x402 protocol has enabled AI agents to perform accountless, KYC-free microtransactions and has processed more than 100 million payments by the end of 2025, with a further 15 million transactions in the first 30 days of this year, according to Cambrian Network and project disclosures. Launched in May 2025 by Coinbase in collaboration with Cloudflare and backed by Cloudflare's management of roughly 20% of global web traffic, x402 repurposes the long-unused HTTP 402 Payment Required status code so that an AI agent can receive a 402 response with pricing terms, sign payment details such as amount, blockchain, and token via EIP712, resend the request, and receive the resource in under a second using stablecoins like USDC. An upgraded x402 V2 went live on December 11, 2025, adding multichain support for Base, Solana, and Avalanche, a Session mechanism that turns wallets into reusable identity credentials, and integration with ACH bank transfers and credit card networks, while Google later integrated x402 into its Agent2Agent protocol and released the Agentic Payments Protocol. The x402 ecosystem token reached a CoinGecko market cap of over $9 billion with daily trading volume above $230 million, but many so-called x402 concept tokens are described as unrelated meme tokens with no direct linkage to protocol usage, and technical as well as regulatory questions remain around EIP712 security, ERC8004's Sybil resistance, fee economics for sub-$0.0001 micropayments on L2s, standard fragmentation against Google's AP2 and a16z's ACP, and unresolved KYC/AML triggers for AI-initiated payments.