Lightning Labs has released the first draft of a technical specification for the Lightning Network Service Authentication Token (LSAT). LSAT is a new protocol standard developed by the Lightning Network Labs that can be used in authentication and payment APIs (bitcoin billing) and leverages the HTTP 402 status code that is not widely used. By using LSAT, service providers have the ability to provide a new “paid API” model between free and subscription APIs: billing on demand, no login, email or password required. In addition, Aperture, an HTTP 402 and LSAT reverse proxy implementation, will also be released. It is currently used in production environments by Lightning Loop. Aperture can easily create paid APIs or services.