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# List usage across customers

GET https://api-gateway.merge.dev/v1/customers/usage

Spend per customer across your organization for a date range, one row per customer that had spend. `start` and `end` are `YYYY-MM-DD`, inclusive, and default to the current month; the range may not exceed 366 days. Requires an organization-level production key.

Reference: https://docs.merge.dev/merge-gateway/embedded-routing/usage/list-customers-usage

## Authentication

- `Authorization` header (bearer token, required) — Your production key sent as a bearer token.

## Request

### Query parameters

- `start` (date, optional)
- `end` (date, optional)

## Response

### 200

Successful Response

- `results` (list of CustomerUsageSummaryResultsItems, optional) — One row per customer with spend in the range, sorted by total_spend descending

## Types

### CustomerUsageSummaryResultsItems

- `customer` (string, optional) — The Customer's id
- `total_spend` (double, optional) — USD, the sum of byok_spend and merge_spend
- `byok_spend` (double, optional) — Spend on provider keys (the customer's own or your organization's), USD
- `merge_spend` (double, optional) — Spend on Merge-managed credentials, USD

## Examples

**Response**

```json
{
  "results": [
    {
      "customer": "string",
      "total_spend": 412.87,
      "byok_spend": 310.44,
      "merge_spend": 102.43
    }
  ]
}
```

**SDK Code**

```python
import requests

url = "https://api-gateway.merge.dev/v1/customers/usage"

headers = {"Authorization": "Bearer <token>"}

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

print(response.json())
```

```javascript
const url = 'https://api-gateway.merge.dev/v1/customers/usage';
const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

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-gateway.merge.dev/v1/customers/usage"

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

	req.Header.Add("Authorization", "Bearer <token>")

	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-gateway.merge.dev/v1/customers/usage")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

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-gateway.merge.dev/v1/customers/usage")
  .header("Authorization", "Bearer <token>")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://api-gateway.merge.dev/v1/customers/usage', [
  'headers' => [
    'Authorization' => 'Bearer <token>',
  ],
]);

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

```csharp
using RestSharp;

var client = new RestClient("https://api-gateway.merge.dev/v1/customers/usage");
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "Bearer <token>");
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["Authorization": "Bearer <token>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://api-gateway.merge.dev/v1/customers/usage")! 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()
```