# API-Key

> API-Key is a multimodal API platform for agents and developers to call
> video, image, music, embeddings and LLM models through one account, one
> wallet and one API key.

## Start here

- [API docs](https://api-key.org/api-docs)
- [Markdown API docs](https://api-key.org/api-docs/index.md)
- [OpenAPI schema](https://api-key.org/openapi.json)
- [API catalog](https://api-key.org/.well-known/api-catalog)
- [Auth.md](https://api-key.org/auth.md)
- [Model catalog](https://api-key.org/v1/models)
- [Credit estimate](https://api-key.org/v1/credits/estimate)
- [Agent connection guide](https://api-key.org/agents)

## Agent guidance

Use `/v1/credits/estimate` before paid media tasks. Pass `max_credits` in
task request bodies when a user has approved a budget. Protected API calls use
`Authorization: Bearer YOUR_API_KEY` or `x-api-key: YOUR_API_KEY`.