The Linux Foundation has formally launched the x402 Foundation, bringing together 40 members including Visa, Mastercard, American Express, Ripple, Stripe, Google, AWS, and Cloudflare to govern a protocol that lets AI agents pay each other without humans in the loop. Coinbase built the standard and handed it over to the foundation, which now counts Ripple, Circle, Solana Foundation, and Stellar Foundation among its premier members.

The protocol activates the HTTP 402 "Payment Required" status code , reserved but unused since the web's earliest days because card fees made sub-cent charges uneconomical. Under x402, a server responds to a request with a 402 and a price; the client signs a stablecoin transfer (typically USDC), resends the request with proof of payment, and gets the data. No account, no card, no prior relationship needed.

That model is tailor-made for AI agents, which cannot open bank accounts or sign SaaS contracts but can sign blockchain transactions. Google has wired x402 into its agent payments protocol, Cloudflare ships it in its agent toolkit, and Amazon integrated it into Bedrock AgentCore , settling payments in roughly 200 milliseconds for fractions of a cent.

The numbers show the thesis is working. Over the past 30 days, x402 handled about 75 million transactions between 94,000 buyers and 22,000 sellers, moving roughly $24 million. That works out to an average payment of 32 cents , a sum no card network can process profitably. The volume is still a rounding error compared to what Visa or Mastercard move in a day, but the trajectory signals where machine-to-machine commerce is heading.

Ripple's XRPL AI Starter Kit supports x402 alongside XRP and RLUSD, giving developers a ready-made path to build agentic payment flows. With deterministic finality in 3,5 seconds and sub-cent pricing, the XRP Ledger is positioned as one of several settlement layers , alongside Solana and Stellar , competing to become the default rail for the coming wave of autonomous agent commerce.