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Block Integrates Bitcoin Lightning into x402 for AI Payments
Developing
In Short: Block has joined the x402 Foundation, an open standard for agentic payments, and has contributed Bitcoin Lightning support to the protocol.
The payment company said Lightning fits transactions that require low costs, fast settlement, and repeated small payments, making it ideal for AI agent-to-agent commerce.
Created by Coinbase, x402 uses the HTTP 402 “Payment Required” response to facilitate payments during web interactions.
Erik Reppel, x402’s creator and a member of its Technical Steering Committee, said the protocol was designed to accommodate different networks without tying it to one payment rail.
Block’s September 24 announcement states that the company has brought Lightning payments into x402 as part of its work on agentic commerce.
A September 23 commit records “exact Lightning on lnbtc,” providing an independent public record of the Lightning specification entering the project.
Steve Lee, head of Block’s Bitcoin development initiative Spiral, made a forward-looking case for the technology, saying, “Bringing Lightning to x402 is a concrete step toward making Bitcoin everyday money for both people and the agents acting on their behalf.”
The strategy aims to expand Bitcoin's real-world utility in an environment where AI agents transact small amounts at high volume without human intervention.
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.
Block’s ongoing push to expand AI-based commerce infrastructure includes its mobile payment service Square and the peer-to-peer payment app Cash App, with Dorsey making Bitcoin a core strategic pillar of the company.
What this adds
The integration of Bitcoin Lightning into x402 is part of Block's broader strategy to expand the utility of Bitcoin in AI-driven commerce.
What's confirmed
- 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.
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.
- As crypto.news reported in its coverage of stablecoin use across agent-payment activity, Circle said USDC accounted for 99.3% of x402 payment volume measured during its second quarter.
- Recent integrations show how developers have been adding network choices to x402.
- Crypto.news reported this week that 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.
- As crypto.news reported, 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.
- We’ve also contributed Bitcoin Lightning payments, which is purpose-built for the instant, low-cost, high-volume… The technical addition was already visible in x402’s public development repository.
- Block’s contribution introduces Bitcoin Lightning as another payment option inside that framework.
- Block announced on the 25th (local time) that it is joining the x402 Foundation and adding Lightning Network support to the x402 protocol.