# HTTP API Reference

## GraphQL API

* **Default:** Enabled on port 8090
* **Endpoint:** `POST /graphql`
* **GraphiQL:** Available at `/` when debug enabled
* **Purpose:** Query Unified Namespace topics

## Topic Browser GraphQL

* [Complete GraphQL API Reference](https://docs.umh.app/reference/http-api/topic-browser-graphql)
* [Schema Documentation](https://docs.umh.app/reference/topic-browser-graphql#schema)
* [Query Examples](https://docs.umh.app/reference/topic-browser-graphql#examples)

## Monitoring

* **Metrics:** See [Production Metrics](https://docs.umh.app/production/metrics)
* **Health:** Via FSM state monitoring