> ## Documentation Index > Fetch the complete documentation index at: https://docs.runflow.io/llms.txt > Use this file to discover all available pages before exploring further. # Runflow > Start AI image and video runs with one HTTP call, then receive results by callback or polling. 45+ models, one auth header. Start AI image and video runs with one HTTP call, then receive results by callback or polling. The Runflow API exposes a curated catalog of [45+ models](/models) from Runflow, Google, Alibaba, OpenAI, and others. Auth is HTTP Bearer. Live count: [`GET /v1/public/models`](https://api.runflow.io/v1/public/models). ## Five-minute quickstart ```bash theme={"dark"} export RUNFLOW_API_KEY="your_key" curl -X POST https://api.runflow.io/v1/models/runflow/background-replace/runs \ -H "Authorization: Bearer $RUNFLOW_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "input": { "prompt": "white studio", "image_url": "https://..." } }' ``` Get a key at [app.runflow.io](https://app.runflow.io/settings/api-keys). Full walkthrough at [Quickstart](/quickstart). ## Where to go next 45+ models, 6 categories, prices and endpoints. First call in under 5 minutes. Generated from the public OpenAPI spec. Skill, llms.txt, OpenAPI catalog. ## Concepts Bearer header. Callbacks, polling, statuses. Async result delivery. Status codes, error envelope. Per-request, per-second, per-megapixel. Headers and backoff. ## Guides Decision tree from task to model. Many inputs, one request. Webhook handler patterns. HMAC verification.