Poe is a multi-model AI gateway built on top of model APIs from providers such as OpenAI, Anthropic, Google, Meta, and Mistral. It exposes a unified chat interface and a Bot API (based on the Fastapi-Poe SDK) that lets developers create, host, and publish custom bots backed by any server-side logic or model. Developers can register webhook endpoints that Poe calls on each user message, enabling fully custom inference pipelines, RAG workflows, or tool-use chains. Monetization hooks allow creators to charge per-message or subscription fees through Poe's built-in payment infrastructure.