{
  "valid": true,
  "model": "<string>",
  "tool": "<string>",
  "pricing": {
    "provider_cost_cents": 123,
    "user_price_cents": 123,
    "markup_percent": 123,
    "pricing_id": "<string>"
  }
}

{
  "error": {
    "code": "model_not_found",
    "message": "Unknown model: flux-shnell"
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "Body validation failed (text: Required)"
  }
}

{
  "error": {
    "code": "model_not_found",
    "message": "Unknown model: flux-shnell",
    "details": "<unknown>"
  }
}