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> For a complete documentation index, see https://www.comet.com/docs/opik/llms.txt.

# Check whether a project has traces

GET http://localhost:5173/api/v1/private/traces/exists

Returns whether the project has at least one trace matching the given scope. Cheap existence probe (LIMIT 1) used to drive empty-state decisions without scanning or aggregating the whole project.

Reference: https://www.comet.com/docs/opik/reference/rest-api/traces/exist

## Servers

- `http://localhost:5173/api` (Local server, default)
- `https://www.comet.com/opik/api` (Opik Cloud)

## Request

### Query parameters

- `project_id` (string, optional)
- `project_name` (string, optional)
- `source` (string, optional) — Restrict the probe to a single ingestion source (e.g. 'sdk' for the Logs empty state), matching the rendered list's logs-source scope. Omit to probe any source.
- `thread_only` (boolean, optional, default: false) — When true, only considers traces that belong to a thread (thread_id is set) — used by the Threads empty state.

## Response

### 200

Trace existence

- `exists` (boolean, optional) — Whether the project has at least one matching entity for the given scope

## Examples

**Response**

```json
{
  "exists": true
}
```

**SDK Code**

```python
import requests

url = "http://localhost:5173/api/v1/private/traces/exists"

response = requests.get(url)

print(response.json())
```

```javascript
const url = 'http://localhost:5173/api/v1/private/traces/exists';
const options = {method: 'GET'};

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 := "http://localhost:5173/api/v1/private/traces/exists"

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

	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("http://localhost:5173/api/v1/private/traces/exists")

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

request = Net::HTTP::Get.new(url)

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("http://localhost:5173/api/v1/private/traces/exists")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'http://localhost:5173/api/v1/private/traces/exists');

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

```csharp
using RestSharp;

var client = new RestClient("http://localhost:5173/api/v1/private/traces/exists");
var request = new RestRequest(Method.GET);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let request = NSMutableURLRequest(url: NSURL(string: "http://localhost:5173/api/v1/private/traces/exists")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"

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()
```