> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.livingbrain.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.livingbrain.com/_mcp/server.

# Bulk brain stats

GET https://api.livingbrain.com/v1/brains/stats

Aggregate counts for many brains in one round trip. Pass a comma-separated `ids` list; brains the caller cannot access are omitted rather than erroring.

Reference: https://docs.livingbrain.com/api-reference/brains/bulk-stats

## Authentication

- `x-api-key` header (required) — Your Living Brain API key. Create one from the dashboard; keys are scoped to an organization and carry the role of the member they were issued to.

## Request

### Query parameters

- `ids` (string, optional) — Comma-separated brain ids, e.g. `ids=a,b,c`. Unowned ids are omitted.

## Response

### 200

Stats keyed by brain id

- `map from string to BrainStatsResDto`

## Errors

### 400 Bad Request Error

Validation failed

- `statusCode` (integer, required) — HTTP status code
- `timestamp` (string, required) — ISO timestamp of the failure
- `path` (string, required) — Request path (query string stripped)
- `message` (string, required) — Human-readable error message
- `body` (ErrorResDtoBody, optional) — Original framework exception response when available, e.g. `{ statusCode, message, error }` with per-field validation messages

### 401 Unauthorized Error

Unauthorized

- `statusCode` (integer, required) — HTTP status code
- `timestamp` (string, required) — ISO timestamp of the failure
- `path` (string, required) — Request path (query string stripped)
- `message` (string, required) — Human-readable error message
- `body` (ErrorResDtoBody, optional) — Original framework exception response when available, e.g. `{ statusCode, message, error }` with per-field validation messages

## Types

### BrainStatsResDto

- `pageCount` (integer, required) — Active (non-deprecated, non-archived) pages
- `deprecatedPageCount` (integer, required) — Deprecated/stale pages awaiting review or recovery
- `archivedPageCount` (integer, required) — Archived pages
- `sourceCount` (integer, required) — Ingest sources ever pushed to the brain
- `connectionCount` (integer, required) — Connections between active pages
- `agentCount` (integer, required) — Host concept; always 0 here (the host may merge its own count)
- `estimatedBytes` (integer, required) — Approximate size of all page bodies in bytes
- `bucketCounts` (map from string to double, required) — Active page count per bucket
- `lastActivityAt` (string, required, nullable) — ISO timestamp of the last compile/read activity

### ErrorResDtoBody

Original framework exception response when available, e.g. `{ statusCode, message, error }` with per-field validation messages

## Examples

**Response**

```json
{}
```

**SDK Code**

```python
import requests

url = "https://api.livingbrain.com/v1/brains/stats"

headers = {"x-api-key": "<apiKey>"}

response = requests.get(url, headers=headers)

print(response.json())
```

```javascript
const url = 'https://api.livingbrain.com/v1/brains/stats';
const options = {method: 'GET', headers: {'x-api-key': '<apiKey>'}};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.livingbrain.com/v1/brains/stats"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("x-api-key", "<apiKey>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.livingbrain.com/v1/brains/stats")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["x-api-key"] = '<apiKey>'

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.get("https://api.livingbrain.com/v1/brains/stats")
  .header("x-api-key", "<apiKey>")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://api.livingbrain.com/v1/brains/stats', [
  'headers' => [
    'x-api-key' => '<apiKey>',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.livingbrain.com/v1/brains/stats");
var request = new RestRequest(Method.GET);
request.AddHeader("x-api-key", "<apiKey>");
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["x-api-key": "<apiKey>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://api.livingbrain.com/v1/brains/stats")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```