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

# Categories

> Every category in the Gravity Index with live service counts

# Categories

The Index is organized into 22 categories spanning the modern developer stack — from AI/LLM
infrastructure to payments, auth, observability, and everything in between.

Call `GET /categories` to get a live count of services per category — or use the
`gravity_index_list_categories` MCP tool.

## Response

<ResponseField name="categories" type="array">
  `name` and `service_count` for every category, sorted alphabetically.
</ResponseField>

<ResponseField name="total" type="number">
  Total number of services in the Index.
</ResponseField>

## Example

```bash theme={null}
curl https://index.trygravity.ai/categories
```

```json theme={null}
{
  "categories": [
    { "name": "AI",              "service_count": 87 },
    { "name": "Analytics",       "service_count": 26 },
    { "name": "Auth",            "service_count": 23 },
    { "name": "Background Jobs", "service_count": 17 },
    { "name": "Cache",           "service_count": 8  },
    { "name": "CMS",             "service_count": 14 },
    { "name": "Commerce",        "service_count": 6  },
    { "name": "CRM",             "service_count": 10 },
    { "name": "Database",        "service_count": 53 },
    { "name": "Email",           "service_count": 23 },
    { "name": "Hosting",         "service_count": 25 },
    { "name": "Infrastructure",  "service_count": 53 },
    { "name": "Monitoring",      "service_count": 39 },
    { "name": "Payments",        "service_count": 25 },
    { "name": "Productivity",    "service_count": 29 },
    { "name": "Realtime",        "service_count": 13 },
    { "name": "Search",          "service_count": 8  },
    { "name": "SMS",             "service_count": 6  },
    { "name": "Storage",         "service_count": 13 },
    { "name": "Support",         "service_count": 7  },
    { "name": "Video",           "service_count": 4  },
    { "name": "Webhooks",        "service_count": 4  }
  ],
  "total": 493
}
```

<Note>
  Counts update whenever new services are added. The snapshot above reflects the initial
  public catalog (493 services, April 2026).
</Note>

## Categories at a glance

| Category            | What's in it                                                      |
| ------------------- | ----------------------------------------------------------------- |
| **AI**              | LLM APIs, embeddings, vector DBs, agent frameworks, model hosting |
| **Analytics**       | Product analytics, BI, attribution, feature flags                 |
| **Auth**            | Identity providers, SSO, MFA, authorization engines               |
| **Background Jobs** | Queue + scheduled-task platforms (BullMQ, Inngest, Trigger, …)    |
| **Cache**           | Managed Redis / KV / edge caches                                  |
| **CMS**             | Headless CMS, MDX, content APIs                                   |
| **Commerce**        | Checkout, subscriptions, marketplaces                             |
| **CRM**             | Revenue / customer data / outbound                                |
| **Database**        | SQL, NoSQL, time-series, graph, vector DBs                        |
| **Email**           | Transactional email, marketing, verification, receiving           |
| **Hosting**         | App hosting, PaaS, serverless runtimes                            |
| **Infrastructure**  | IaC, secrets, CI/CD, SRE tooling                                  |
| **Monitoring**      | Error tracking, APM, logging, uptime                              |
| **Payments**        | Processors, tax, fraud, payouts                                   |
| **Productivity**    | Docs, notes, meetings, automation                                 |
| **Realtime**        | WebSockets, presence, collaborative editing                       |
| **Search**          | Full-text + vector search APIs                                    |
| **SMS**             | SMS/MMS APIs, voice, number management                            |
| **Storage**         | Object storage, image/video CDNs, file uploads                    |
| **Support**         | Helpdesk, chat, feedback portals                                  |
| **Video**           | Video streaming, conferencing, recording                          |
| **Webhooks**        | Webhook relays, event gateways                                    |