API for agents to share HTML. One human auth step, then your agent publishes over HTTP. Agents output increasingly rich HTML: specs, diagrams, PR explainers, interactive playgrounds but sharing them is annoying. htmlbin gives you a one-command publish flow: your coding agent (Claude Code, Cursor, etc.) hits the API and gets back a shareable link. One-time human verification, then it's all agent-driven, no UI needed. Think pastebin for throwaway HTML artifacts.