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Block Integrates Bitcoin Lightning into x402 for AI Payments
Confirmed
In Short: Block has joined the x402 Foundation and added Bitcoin Lightning support to facilitate low-cost, fast payments for AI agents.
Block has joined the x402 Foundation and contributed Bitcoin Lightning support to the open payment protocol used by AI agents, web services, and applications. The company said Lightning fits transactions that require low costs, fast settlement, and repeated small payments.
Created by Coinbase, x402 uses the HTTP 402 “Payment Required” response to let software request and settle payments during an ordinary web interaction. Block’s contribution introduces Bitcoin Lightning as another payment option inside the x402 framework.
Steve Lee, head of Block’s Bitcoin development initiative Spiral, said, 'Bringing Lightning to x402 is a concrete step toward making Bitcoin everyday money for both people and the agents acting on their behalf. We'll help the industry build more services on top of this.
The Linux Foundation announced the x402 Foundation in April as a neutral body intended to oversee development of the payment standard outside the control of one vendor. Block’s September 24 announcement states that the company has brought Lightning payments into x402 as part of its work on agentic commerce.
Block’s contribution is part of its ongoing push to expand AI-based commerce infrastructure. The company operates the mobile payment service Square and the peer-to-peer payment app Cash App, with Bitcoin as a core strategic pillar.
The technical addition was already visible in x402’s public development repository. A September 23 commit records 'exact Lightning on lnbtc,' providing an independent public record of the Lightning specification entering the project immediately before Block disclosed its participation.
Block’s integration of Lightning into x402 is designed to facilitate small-value, high-frequency payments required in AI agent-to-agent commerce. Lightning is a layer-2 technology that processes transactions off the Bitcoin main chain, offering low fees and fast processing speeds.
With Block's addition, a Bitcoin-based payment rail has been added to a standard that was previously centered on fiat currencies and stablecoins. This move extends Block's strategy to expand Bitcoin's real-world utility in an environment where AI agents transact small amounts at high volume without human intervention.
Block said Lightning is suited to the kind of payments that agentic commerce will depend on. The company is excited to help the wider industry build on the new Lightning support.
Recent integrations show how developers have been adding network choices to x402. For instance, AI-agent payment support through x402 reached Cardano’s software stack, with an initial TypeScript release and a facilitator tested on the network’s pre-production environment.
In related coverage, crypto.news reported that autonomous payment infrastructure on Casper mainnet uses an x402 facilitator to let AI agents purchase online services through HTTP-based payments.
Agentic payment activity on XRP Ledger passed one million x402 transactions by July, while Ripple-backed t54.ai introduced tools and directories for AI projects using the network.
What's confirmed
- Block has joined the x402 Foundation and contributed Bitcoin Lightning support to the open payment protocol used by AI agents, web services and applications.
- The Linux Foundation announced the x402 Foundation in April as a neutral body intended to oversee development of the payment standard outside the control of one vendor.
- Steve Lee, head of Spiral, Block's Bitcoin development initiative, said: "Bringing Lightning to x402 is a concrete step toward making Bitcoin everyday money for both people and the agents acting on their behalf. We'll help the industry build more services on top of this." x402 is an open payment standard designed to allow AI agents and web services to autonomously pay for API access, data, and digital service fees without a separate manual payment process.
What's still developing
- The company said Lightning was designed for “instant, low-cost, high-volume payments,” though Block did not publish transaction volumes, merchant deployments or AI-agent usage figures specifically tied to its Lightning implementation.
- Block now joins a list of large technology backers.