x402 Foundation: Visa, Mastercard, Ripple back agent payments protocol
In brief
- x402 Foundation governs protocol with 40 members: Visa, Mastercard, Ripple, Google, AWS
- Protocol processed 75 million transactions and $24 million in volume last month
- Average payment size of 32 cents enables autonomous agent transactions without accounts
- Coinbase contributed protocol after filling 30-year gap in HTTP 402 standard
How it works
Under x402, a server that wants payment answers a request with a 402 response and a price. The client signs a stablecoin transfer (usually in USDC), resends the request with payment attached, and receives the data. The protocol needs no account, no card, and no prior relationship between the two parties.
This matters because autonomous agents cannot open bank accounts, pass credit checks, or sign SaaS contracts—but they can sign transactions. A machine buying data from another machine, or renting compute time, or accessing an API, can now do so instantly and cheaply.
Traction and governance
The protocol handled about 75 million transactions over the past 30 days, moving approximately $24 million between some 94,000 buyers and 22,000 sellers. That works out to an average payment of about 32 cents—a charge size that no traditional card network can process profitably.
The x402 Foundation is now operating under formal governance with 40 members. Premier members include Ripple, Visa, Mastercard, American Express, Stripe, Adyen, Fiserv, Shopify, Google, Amazon Web Services, Cloudflare, Circle, MoonPay, Solana Foundation, and Stellar Foundation.
Google has wired x402 into its own agent payments protocol, and Cloudflare ships it in its agent toolkit. The protocol is processing roughly 29 transactions every second.
Coinbase's contribution of the protocol is complete, and the foundation now operates it as open infrastructure.
