curl --request POST \
  --url https://app.autoposting.ai/api-proxy/clips/estimate-cost \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "durationMs": 60000
}
'

{
  "success": true,
  "data": {
    "estimatedCredits": 5,
    "availableCredits": 100,
    "sufficient": true
  }
}