> ## Documentation Index
> Fetch the complete documentation index at: https://dripart-chore-sync-comfy-api-v2-spec.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Use Eleven Sfx V2 with Comfy Router

> Call elevenlabs/eleven_sfx_v2 through Comfy Router: endpoint, request shape and the response Router returns.

API Reference for `elevenlabs/eleven_sfx_v2`, served by Comfy Router from Elevenlabs.

## Quick start

Create a key at [platform.comfy.org/profile/api-keys](https://platform.comfy.org/profile/api-keys) and export it as `COMFY_API_KEY`. The Python and TypeScript snippets use the Comfy SDKs (`pip install comfy-sdk`, `npm install @comfyorg/sdk`); the cURL snippet is the same call over raw HTTP.

**Model ID:** `elevenlabs/eleven_sfx_v2`

**Endpoint:** `POST https://api.comfy.org/v2/models/elevenlabs/eleven_sfx_v2`

<CodeGroup>
  ```python Python theme={null}
  from comfy_sdk import Comfy

  # Reads COMFY_API_KEY from the environment. Each call sends a fresh
  # Idempotency-Key and waits up to 10 minutes for the finished result.
  with Comfy() as client:
      result = client.models.run(
          "elevenlabs/eleven_sfx_v2",
          {
              "duration_seconds": 5,
              "text": "A distant rumble of thunder rolling across a valley.",
          },
      )

  print(result)
  ```

  ```typescript TypeScript theme={null}
  import { comfy } from "@comfyorg/sdk";

  // Reads COMFY_API_KEY from the environment. Each call sends a fresh
  // Idempotency-Key and waits up to 10 minutes for the finished result.
  const { data } = await comfy.models.run("elevenlabs/eleven_sfx_v2", {
    duration_seconds: 5,
    text: "A distant rumble of thunder rolling across a valley.",
  });

  console.log(data);
  ```

  ```bash cURL theme={null}
  curl https://api.comfy.org/v2/models/elevenlabs/eleven_sfx_v2 \
    -H "X-API-Key: $COMFY_API_KEY" \
    -H "Idempotency-Key: $(uuidgen)" \
    -H "Content-Type: application/json" \
    -d "{\"duration_seconds\": 5, \"text\": \"A distant rumble of thunder rolling across a valley.\"}"
  ```
</CodeGroup>

## Schema

### Input

<ParamField body="duration_seconds" type="number" required>
  The duration of the sound which will be generated in seconds.
  Must be at least 0.5 and at most 30.
  REQUIRED on this route: unlike the upstream ElevenLabs API, which
  guesses an optimal duration when the field is null, this route
  rejects a request that omits it with 400 "Duration is required".
  The field stays nullable only so an explicit null is a well-formed
  document; it is still refused.
  This value is the quantity the request is metered on.

  Range: `0.5` to `30`

  Format: `double`
</ParamField>

<ParamField body="loop" type="boolean" default="false">
  Whether to create a sound effect that loops smoothly.
  ElevenLabs documents this as available only for the
  'eleven\_text\_to\_sound\_v2' model, which this route does NOT admit
  (see model\_id), so it may have no effect here.
</ParamField>

<ParamField body="model_id" type="string">
  The model ID to use for the sound generation. This route admits
  'eleven\_sfx\_v2' and nothing else; any other value is rejected with
  400 before the request reaches ElevenLabs. It is NOT in this
  schema's `required` list because Comfy Router fills it from the
  `{model}` path segment of /v2/models/elevenlabs/\{model}, so a Router
  caller omits it.
</ParamField>

<ParamField body="prompt_influence" type="number">
  A higher prompt influence makes your generation follow the prompt
  more closely while also making generations less variable.
  Must be a value between 0 and 1. Defaults to 0.3.

  Range: `0` to `1`

  Format: `double`
</ParamField>

<ParamField body="text" type="string" required>
  The text that will get converted into a sound effect.
</ParamField>

Generated from the schema Router serves at `GET /v2/models/elevenlabs/eleven_sfx_v2/openapi.json`, the same document it validates a call against before the request reaches the provider.

### Output

Router does not publish an output schema for this model.

## Examples

### Input

```json theme={null}
{
  "duration_seconds": 5,
  "text": "A distant rumble of thunder rolling across a valley."
}
```

## Before you ship

The snippets above are the shortest working call. Three things are the same for every model and are documented once on the [Comfy Router headers](/development/comfy-router/headers) page: send an `Idempotency-Key` on every paid call and reuse it when you retry, expect the connection to be held up to Router's 10 minute deadline, and keep `X-Comfy-Request-Id` from every response. The SDKs do all three for you; the cURL tab does none of them. On failure, `X-Comfy-Error-Type` names the bucket, and a `422` means the body failed the model's schema and was never billed.

<CardGroup cols={3}>
  <Card title="Headers" icon="list" href="/development/comfy-router/headers">
    Authentication, idempotency, request IDs, error buckets, retry pacing, spend limits.
  </Card>

  <Card title="Quick Start" icon="rocket" href="/development/comfy-router/quickstart">
    Typed error handling in Python and TypeScript, reading the 422, walking the catalog.
  </Card>

  <Card title="Limitations" icon="triangle-exclamation" href="/development/comfy-router/limitations">
    What Router does not do today, and what to use instead.
  </Card>
</CardGroup>