curl --request GET \
  --url https://api.agentmark.co/v1/spans \
  --header 'Authorization: Bearer <token>' \
  --header 'X-Agentmark-App-Id: <api-key>'

{
  "data": [
    {
      "cost": 123,
      "duration_ms": 123,
      "id": "<string>",
      "input_tokens": 1,
      "metadata": {},
      "model": "<string>",
      "name": "<string>",
      "output_tokens": 1,
      "parent_id": "<string>",
      "prompt_name": "<string>",
      "service_name": "<string>",
      "span_kind": "<string>",
      "status": "UNSET",
      "status_message": "<string>",
      "timestamp": "2023-11-07T05:31:56Z",
      "tokens": 1,
      "trace_id": "<string>",
      "type": "<string>"
    }
  ],
  "pagination": {
    "limit": 1,
    "offset": 1,
    "total": 1
  }
}