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ID=$(curl -s -X POST https://renderhour.com/api/gateway/v1/videos/generations \
  -H "Authorization: Bearer $RENDERHOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "kie/kling/ai-avatar-pro",
  "prompt": "Slow aerial shot over a foggy coastline at sunrise",
  "image_url": "https://example.com/input.png",
  "audio_url": "<audio_url from /media/uploads>"
}' | jq -r '.id')

# 202 Accepted — the render is queued; poll until it finishes.
while :; do
  JOB=$(curl -s https://renderhour.com/api/gateway/v1/videos/generations/$ID \
    -H "Authorization: Bearer $RENDERHOUR_API_KEY")
  case "$(echo "$JOB" | jq -r '.status')" in
    succeeded) echo "$JOB" | jq -r '.data[0].url'; break ;;
    failed|cancelled) echo "$JOB" | jq -r '.error // .status'; exit 1 ;;
  esac
  sleep 5
done

$0.115 per second of your audio — one second of the attached audio, rendered at 1080p (kie's Pro tier). Quoted before the run; a failed run is not charged.

Or copy the request and run it with your RenderHour API key — the one in your profile.