curl --request POST \
  --url https://ninjachat.ai/api/v1/estimate \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "items": [
    {
      "group": "chat",
      "model": "gpt-5",
      "count": 10
    },
    {
      "group": "images",
      "model": "flux-2-klein",
      "count": 5
    }
  ]
}
'

{
  "items": [
    {
      "group": "<string>",
      "model": "<string>",
      "count": 123,
      "estimated_cost": "$0.060"
    }
  ],
  "total": "$0.090"
}