# Skill: effect/sfx-kit — "אפקטים קוליים" (Sound-effects kit)

Short-form sounds — whoosh, swish, hit, boom, bell, pop, scroll, riser, glitch, slow-mo — at a moment or a word.
צלילים לסרטונים קצרים — ווש, סוויש, מכה, בום, פעמון, פופ, גלילה, רייזר, גליץ׳, סלואו — ברגע או על מילה.

Category: Audio · סאונד · a real preview: https://media.gpt.org.il/lookbook/effects/sfx-kit.mp4?v=mv19exzc
Price: **60 credits per finished minute**: the render itself — 1 credit per second of 1080p output. Combined with captions, a hook or other effects: still one render, nothing more for combining.

Base URL: `https://apihub.co.il` · Auth: `Authorization: Bearer <API key>` · Docs: `/docs` (group "Video Effects")
Send `X-Tag: <job name>` on every call of one video; `GET /v1/usage?tag=<job name>` returns what it cost.
**Files are kept 24 hours** — download the finished video.

---

## 1. On its own — one call

```jsonc
POST /v1/effects/sfx-kit             // x-wait-ms: 110000
{
  "video_url": "https://media.gpt.org.il/samples/sample-he.mp4",
  "start": 1.1,
  "params": {
    "sound": "boom"
  }
}
```

A normal render: `status: processing` → poll `GET /v1/executions/{id}` until `completed`, then read `output.url`.

When it plays: a moment: `start` (seconds of the finished video) or `at` (a word id).

## 2. With captions, a hook and other effects — the same render

```jsonc
POST /v1/studio/edit               // x-wait-ms: 110000
{
  "video_url": "<the video>",
  "language_code": "he",
  "captions": {
    "style": "classic"
  },
  "effects": [
    {
      "id": "sfx-kit",
      "params": {
        "sound": "boom"
      },
      "start": 1.1
    }
  ],
  "audio": {
    "normalize": true
  },
  "output": {
    "aspect_ratio": "9:16",
    "resolution": "1080",
    "fit": "crop",
    "quality": "high"
  }
}
```

`effects` is a list: add more entries for more effects. The engine applies them by pipeline stage (cuts and time →
camera → grade and looks → overlays → text and captions → sound), never by their order in the list. An edit has one
`transition`, one `color` grade, one `music` bed, one `speed` and one caption style: two effects that set the same
one are refused with a message that names them.

## 3. Params

| param | default | range / options | what it does |
|---|---|---|---|
| `sound` | `"pop"` | `whoosh` · `swish` · `hit` · `boom` · `bell` · `pop` · `scroll` · `riser` · `glitch` · `slomo` | Which sound (CC0 library, licence on record) |
| `volume` | `1` | 0–4 | 1 = sits just under the speech |

GET `/v1/effects/sfx-kit` returns the same as JSON (with the full body schema). Every field has a default; numbers
outside their range are refused with the field's name.