The Usage API returns **aggregated counts** of tool calls and sessions. Use it to power billing dashboards, customer-facing analytics, or internal utilization reports. For individual events, use the [Logs API](/reference/api-reference/logs).

There are two query shapes:

- **Summary**: totals across one or more entity types in a time window.
- **Breakdown**: one entity type, grouped by a dimension (tool, user, session, etc.).

Each shape comes in an org-scoped and a project-scoped flavor. The org-scoped endpoints are documented below; the project-scoped usage endpoints (`POST /api/v3.1/project/usage/*`) also appear on the [Projects](/reference/api-reference/projects) reference page.

## Authentication

| Endpoint | Header | Scope |
|---|---|---|
| `POST /api/v3.1/org/usage/summary` | `x-org-api-key` *(or org JWT)* | All projects in your org |
| `POST /api/v3.1/org/usage/{entity_type}` | `x-org-api-key` *(or org JWT)* | All projects in your org |
| `POST /api/v3.1/project/usage/summary` | `x-api-key` *(or cookie)* | Single project |
| `POST /api/v3.1/project/usage/{entity_type}` | `x-api-key` *(or cookie)* | Single project |

The org endpoints accept a `project_id` filter so you can slice by project without rotating keys.

## Entity types

| Entity type | What it counts |
|---|---|
| `tool_calls` | Every tool execution (successful or failed) |
| `sessions` | Sessions created |

## Summary

Totals across entity types for a time window.

```bash
curl -X POST https://backend.composio.dev/api/v3.1/project/usage/summary \
  -H "x-api-key: YOUR_PROJECT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "from": 1744848000000,
    "to": 1744934400000,
    "entity_types": ["tool_calls", "sessions"]
  }'
```

Response:

```json
{
  "entities": {
    "tool_calls": { "unit": "count", "total_quantity": "142", "event_count": 142 },
    "sessions":  { "unit": "count", "total_quantity": "8",   "event_count": 8 }
  }
}
```

### Summary parameters

| Field | Type | Default | Notes |
|---|---|---|---|
| `from` | number | 30 days ago | Epoch milliseconds |
| `to` | number | now | Epoch milliseconds |
| `entity_types` | string[] | all | Subset of `tool_calls`, `sessions` |
| `filters.user_id` | string \| string[] | — | Filter events by initiating user |
| `filters.session_id` | string \| string[] | — | Filter events by session |
| `filters.project_id` | string \| string[] | — | Only meaningful on org endpoints; ignored on project endpoints |

## Breakdown

One entity type, grouped by a dimension. Useful for answering "top N" questions.

```bash
curl -X POST https://backend.composio.dev/api/v3.1/project/usage/tool_calls \
  -H "x-api-key: YOUR_PROJECT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "from": 1744848000000,
    "to": 1744934400000,
    "group_by": "toolkit_slug",
    "order_by": "total_quantity",
    "order_direction": "desc",
    "limit": 10
  }'
```

Response:

```json
{
  "entity_type": "tool_calls",
  "unit": "count",
  "total_quantity": "142",
  "event_count": 142,
  "groups": [
    { "key": "github", "total_quantity": "80", "event_count": 80 },
    { "key": "slack",  "total_quantity": "62", "event_count": 62 }
  ]
}
```

### Breakdown `group_by` options

| Entity | Org scope | Project scope | Default |
|---|---|---|---|
| `tool_calls` | `tool_slug`, `toolkit_slug`, `connected_account_id`, `user_id`, `session_id`, `project_id` | same minus `project_id` | `tool_slug` |
| `sessions` | `user_id`, `project_id` | `user_id` | `user_id` |

### Breakdown parameters

| Field | Type | Default | Notes |
|---|---|---|---|
| `from` | number | 30 days ago | Epoch ms |
| `to` | number | now | Epoch ms |
| `group_by` | string | see table | Dimension to group by |
| `order_by` | string | `total_quantity` | One of `key`, `total_quantity`, `event_count` |
| `order_direction` | `"asc"` \| `"desc"` | `"desc"` | |
| `limit` | number | 50 | Max groups returned |
| `filters` | object | — | See Filters below |

## Filters

Filters live in a `filters` object on the request body. Each filter value can be a **single string** or an **array of strings**:

- Within a single field, values are OR-combined (`user_id: ["a", "b"]` matches events for user *a or b*).
- Across fields, filters are AND-combined.

```json
{
  "filters": {
    "user_id": ["user_123", "user_456"],
    "session_id": "sess_abc"
  }
}
```

The `project_id` filter is only meaningful on the org-scoped endpoints. Project endpoints accept the field but ignore it (your key already pins the scope to a single project).

## Time ranges

- `from` and `to` are **epoch milliseconds**.
- `from` defaults to 30 days before `to`.
- `to` defaults to the current time.
- Maximum range: **366 days**. Longer ranges return a 400.

## Recipes

### Top 10 tools my org called last week

```bash
WEEK_AGO=$(( $(date +%s) - 604800 ))000
NOW=$(date +%s)000
curl -X POST https://backend.composio.dev/api/v3.1/org/usage/tool_calls \
  -H "x-org-api-key: YOUR_ORG_API_KEY" \
  -H "Content-Type: application/json" \
  -d "{
    \"from\": ${WEEK_AGO},
    \"to\": ${NOW},
    \"group_by\": \"tool_slug\",
    \"limit\": 10
  }"
```

### Tool call count per user for my project this month

```bash
MONTH_AGO=$(( $(date +%s) - 2592000 ))000
NOW=$(date +%s)000
curl -X POST https://backend.composio.dev/api/v3.1/project/usage/tool_calls \
  -H "x-api-key: YOUR_PROJECT_API_KEY" \
  -H "Content-Type: application/json" \
  -d "{
    \"from\": ${MONTH_AGO},
    \"to\": ${NOW},
    \"group_by\": \"user_id\",
    \"limit\": 50
  }"
```

### Which toolkits is a specific user using?

```bash
curl -X POST https://backend.composio.dev/api/v3.1/project/usage/tool_calls \
  -H "x-api-key: YOUR_PROJECT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "group_by": "toolkit_slug",
    "filters": { "user_id": "user_abc123" }
  }'
```
