> For the complete documentation index, see [llms.txt](https://satran004.gitbook.io/aion-graphql/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://satran004.gitbook.io/aion-graphql/graphql-api-types.md).

# GraphQL API Types

The AION GraphQL API are categorized into three categories

> **Query** - All read-only operations
>
> **Mutation** - Operations which change the state in the blockchain
>
> **Subscription** - Provides GraphQL subscription support for events.  Example: Contract events. This apis can be called through websocket.  *(This type of apis are in experimental stage now)*

Detailed API  documentation can be found at [*https://satran004.github.io/aion-graphql-docs/*](https://satran004.github.io/aion-graphql-docs/)