DECRYPT · 2026-11-04 17:59 UTC

What Is x402? How AI Agents Pay With Crypto

x402 is an open payment standard from Coinbase that uses HTTP 402 status code to enable AI agents and apps to pay for online services in stablecoins. Payments are primarily made in USDC on Base chain through facilitators, allowing buyers to sign authorization instead of creating accounts or API keys. Over 50 companies including Visa, Mastercard, and Google have joined the x402 Foundation, which now governs the protocol under the Linux Foundation.

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