Designing with Sleek Overview sleek.design provides a REST API at to create projects, design screens from a brief, and fetch their HTML and renders. Base URL : Auth : , except the public device start/poll endpoints Content-Type : send for JSON request bodies. CORS : Enabled on all endpoints Envelope : check HTTP status first. Successful JSON wraps its payload in ; lists also include sibling . Errors use top-level , and , with optional . Successful screenshots and share cards return image bytes; has no body. Ids : opaque 11-character tokens like , with no type prefix. Nothing about an id says…