> ## Documentation Index
> Fetch the complete documentation index at: https://astronomer.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Develop and test APC API queries

The Astronomer APC API is available in a [GraphQL playground](https://www.apollographql.com/docs/apollo-server/v2/testing/graphql-playground/) where you can view the APC API schema and documentation, as well as model, test, and export requests. To test requests in the playground, you must have a valid [authentication token](/docs/astro-private-cloud/v-2-x/houston-api-authenticate).

1. Access the Astronomer APC API GraphQL playground at `https://houston.<your-base-domain>/v1`.
2. Click **HTTP Headers**.
3. Add your authentication token in the following format:

   ```graphql wrap theme={null}
   {"authorization": "<your-api-token>"}
   ```

You can now run APC API queries directly in your browser using the **Play** button in the GraphQL playground.