curl --request GET \
  --url https://openrouter.ai/api/v1/datasets/session-cost \
  --header 'Authorization: Bearer <token>'

import requests

url = "https://openrouter.ai/api/v1/datasets/session-cost"

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

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

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://openrouter.ai/api/v1/datasets/session-cost', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://openrouter.ai/api/v1/datasets/session-cost",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://openrouter.ai/api/v1/datasets/session-cost"

	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(string(body))

}

HttpResponse<String> response = Unirest.get("https://openrouter.ai/api/v1/datasets/session-cost")
  .header("Authorization", "Bearer <token>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://openrouter.ai/api/v1/datasets/session-cost")

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

{
  "data": [
    {
      "app_name": "Hermes Agent",
      "app_slug": "hermes-agent",
      "median_session_cost_usd": 1.74,
      "model_permaslug": "anthropic/claude-4.8-opus",
      "turn_range": "10-49-turns"
    }
  ],
  "meta": {
    "as_of": "2026-05-12T02:00:00.000Z",
    "version": "v1",
    "window_days": 30,
    "window_end_date": "2026-05-11"
  }
}

{
  "error": {
    "code": 400,
    "message": "Invalid request parameters"
  }
}

{
  "error": {
    "code": 401,
    "message": "Missing Authentication header"
  }
}

{
  "error": {
    "code": 429,
    "message": "Rate limit exceeded"
  }
}

{
  "error": {
    "code": 500,
    "message": "Internal Server Error"
  }
}