AI agents pay inference fees in Bitcoin… Lightning Labs unveils pi402

Lightning Labs has released pi402, an open-source extension that lets AI coding agents pay for model inference in bitcoin (BTC) over the Lightning Network, with the agent settling a payment request from a paid model server and then continuing its task. The tool runs inside the Pi coding agent, where developers fund a wallet and set spending limits so the agent handles payments without buyers registering accounts or card details, and without sellers handing over their model API keys. The launch matters because it gives autonomous software agents a native, accountless way to buy compute using bitcoin's Lightning rails, a use case that could expand demand for small, high-frequency BTC payments. What to watch next is adoption beyond the Pi environment, including whether other agent frameworks and model providers integrate pi402 and how Lightning routing capacity and fees hold up under machine-generated payment volumes.