- Jack Dorsey-led Block has become a member of the x402 Foundation, integrating Bitcoin Lightning support into the payment protocol.
- This integration facilitates rapid, affordable transactions between online resources—such as APIs and data—and autonomous AI agents.
Payments firm Block, headed by Jack Dorsey, has officially joined the x402 Foundation. As part of its broader push into machine-to-machine transactions, the company has added Bitcoin Lightning Network capabilities to the open payment protocol.
Revealing the initiative on September 24, Block explained that the Lightning Network is well-suited for the micro-transactions characteristic of “agentic commerce.” This integration provides x402 users with a Bitcoin Lightning alternative. The open standard allows web services and software agents to transact seamlessly via standard internet requests.
Block has joined the x402 Foundation, an open standard for agentic payments, to help build the rails that will let people, businesses, and agents pay and get paid.
We’ve also contributed Bitcoin Lightning payments, which is purpose-built for the instant, low-cost, high-volume…
— Block (@blocks) September 24, 2026
Bitcoin Lightning Integrates With x402 Payment Network
By leveraging the HTTP 402 “Payment Required” status code, x402 manages transactions efficiently. When an AI agent attempts to access a fee-based digital service, dataset, or API, the host service can trigger a payment request. The agent then completes the payment and resubmits the request accompanied by proof of payment. Across the entire x402 network, the platform documented 75.41 million transactions totaling $24.24 million in volume over the trailing 30-day period, though these metrics encompass all network activity rather than Lightning-specific transactions alone.
Block designed its Lightning integration to handle swift, cost-effective transfers, specifically targeting low-value transactions. Steve Lee, who leads Block’s Bitcoin development group Spiral, noted that introducing Lightning to x402 advances the mission of establishing Bitcoin as a practical, everyday currency for both individuals and their acting AI agents.
The codebase in x402’s public repository already reflects this technical integration. A commit made on September 23 introduced specifications for “exact Lightning on lnbtc.” Nevertheless, this Lightning specification remains part of a developing framework, with reports indicating that the Python implementation still requires further testing on real nodes alongside peer review.
Neutral governance for the payment standard is overseen by the Linux Foundation via the x402 Foundation. At its operational launch in July, the Linux Foundation reported that the organization boasted 40 members spanning cloud infrastructure, technology, and payment sectors.
With Block’s integration, x402 gains an alternative Bitcoin settlement channel alongside traditional payment rails and stablecoins. Beyond this partnership, Block continues developing alternative AI commerce infrastructure, including the Universal Commerce Protocol and its open-source Goose AI agent.
At this stage, the update functions primarily as an expansion of the protocol and its underlying infrastructure. While it successfully opens the door for Bitcoin Lightning transactions within x402, widespread implementation by online services and AI agents will rely on ongoing developer testing and integration.
Frequently Asked Questions
What is the x402 Foundation?
The x402 Foundation is an organization operated under the Linux Foundation that provides neutral governance for an open payment standard enabling software agents and web services to execute payments through regular internet requests.
How does the Bitcoin Lightning integration work with x402?
The system utilizes the HTTP 402 “Payment Required” response. When an AI agent tries to access a paid digital service, API, or dataset, the service requests payment. The agent fulfills the payment and repeats the request with proof of completion.
Who leads Block’s Bitcoin development initiative, Spiral?
Steve Lee serves as the head of Block’s Bitcoin development initiative, Spiral.
Are the transaction figures for x402 specific to Bitcoin?
No. The reported metrics—75.41 million transactions and $24.24 million in volume over 30 days—cover the entire x402 network rather than exclusively tracking Bitcoin or Lightning activity.
