Lightning Labs Launches pi402, AI Agents Can Use Bitcoin to Pay for Inference Fees

Lightning Labs released the open-source extension pi402 on November 12, allowing AI programming agents to use Bitcoin via the Lightning Network to pay for inference fees. This tool is specifically designed for Pi programming agents and does not require account registration, API keys, or credit cards; agents can pay invoices after seeing the price to resume work. Pi402 is based on the L402 protocol, combining the HTTP 402 'Payment Required' response with Lightning Network invoices, enabling instant settlement after agent payment, implementing a token-based billing model that charges based on actual consumption. Sellers can accept payments through the Aperture and Lightmeter tools, and neither party needs to run a Lightning node, with payments processed by the Ark-based Wavelength wallet. The demonstration prices are $0.375 per million input tokens and $1.50 per million output tokens.

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