Block Joins x402 Foundation and Adds Bitcoin Lightning Support

Overview

• Block formally joined the Linux Foundation‑governed x402 Foundation and announced contribution of Bitcoin Lightning support, with a public code commit dated September 23 showing “exact Lightning on lnbtc” ahead of the company’s September 24 announcement.
• x402 is an open payment standard that uses the HTTP 402 “Payment Required” response so software agents can automatically pay for APIs, data, and other digital services during normal web requests.
• The x402 Foundation reports about 75.41 million transactions and $24.24 million in volume over a recent 30‑day window, but Circle says USDC made up 99.3% of measured x402 volume in its latest quarter, so stablecoins still dominate current activity.
• Block said Lightning fits the low‑cost, fast‑settlement, high‑frequency payments agentic commerce will need, but it did not provide metrics for Lightning usage or a timetable for integrating Lightning into consumer products like Square or Cash App.
• The contribution expands x402’s multi‑rail approach under neutral governance as other blockchains and services — including Cardano, Casper, XRP Ledger, The Graph, and AWS Bedrock AgentCore — add support, and it builds on Block’s prior agentic work such as Spiral and the Agentic AI Foundation.