curl --request POST \
  --url https://api.example.com/route/upgrade \
  --header 'Content-Type: application/json' \
  --data '
{
  "prompt": "<string>",
  "task_hint": "default",
  "max_cost_usd": 0.05,
  "prefer_premium": false,
  "tier_preset": "balanced"
}
'

{}