curl --request POST \
  --url https://api.example.com/api/v1/credits/estimate \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "operation_type": "<string>",
  "operation_count": 1,
  "file_size_mb": 1,
  "user_tier": "<string>"
}
'

{
  "credits_required": 1,
  "operation_type": "<string>",
  "operation_count": 123,
  "pricing_mode": "<string>",
  "unit_cost": 123,
  "tier_discount": 123,
  "breakdown": {}
}