Block adds Bitcoin Lightning support to x402 payments protocol
Jack Dorsey's Block has integrated the Lightning Network into the x402 payment standard, giving AI agents a way to pay fractions of a cent for data without accounts or passwords.
Key points
- Block pushed the Lightning code on Sept. 23 and announced the integration on Sept. 24, according to Bitcoin.com News.
- Circle's USDC stablecoin previously accounted for 99.3 percent of x402 payment volume.
- x402 handled 75.41 million transactions worth $24.24 million over a recent 30-day window, an average of about 32 cents each.
- Google, Amazon Web Services, Stripe, Mastercard and Visa joined the Linux Foundation's x402 effort in April 2026.
- The Python implementation still needs real-node testing, and Block gave no timeline for Cash App, Square or Bitkey support.
Block, the payments company led by Jack Dorsey, has plugged the Bitcoin Lightning Network into the x402 payment standard, Bitcoin.com News reports. The company pushed the code on Sept. 23 and announced the integration on Sept. 24. The move gives the web's long-dormant HTTP 402 status code a working checkout lane for machine payments.
The 402 code was reserved decades ago and labelled Payment Required, but the web instead built credit card forms and password walls. Generative AI changed the demand. Software agents now need to buy data, rent computing power and call APIs thousands of times an hour, and they cannot fill in forms or remember passwords.
Reviving a dormant code
The x402 standard began inside Coinbase as an effort to revive that code, and Coinbase later handed it to the Linux Foundation. Google, Amazon Web Services, Stripe, Mastercard and Visa joined the foundation in April 2026. Block is now part of that group, bringing the Bitcoin network with it.
The mechanics are simple. A client asks a server for data, the server replies with a 402 code and issues a Lightning invoice, and the client pays and returns a cryptographic receipt called a payment preimage. A facilitator checks the numbers, and the data unlocks. Funds move off-chain in milliseconds, with no account or password needed.
How the payment works
Steve Lee, who heads Block's open-source Bitcoin unit Spiral, said agents will make billions of small payments that need rails which are instant, low-cost and open to anyone. He described Lightning as built for exactly that, and called the integration a concrete step toward making Bitcoin everyday money for people and the agents acting on their behalf.
The protocol was meant to be agnostic about which money is used, but in practice it leaned on corporate stablecoins. Circle recently said its USDC token accounted for 99.3 percent of x402 payment volume. Block's contribution introduces a layer two bearer asset and shows the standard can handle different kinds of money.
Stablecoin dominance and limits
The numbers explain the appeal. Over the latest 30-day window, x402 processed 75.41 million transactions worth just $24.24 million, an average of about 32 cents. Card networks will not process such small sums without losing them to fees, while Lightning can settle a payment for a single satoshi.
Questions remain. The Python implementation for Lightning on x402 still needs real-node testing, and Block has given no timeline for support in Cash App, Square or Bitkey. The standard also needs large Lightning channel capacity and reliable inbound liquidity, since failed routing would break the system for agents paying thousands of times an hour.