> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Use Flashvsr with Comfy Router

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

API Reference for `wavespeed/flashvsr`, served by Comfy Router from WaveSpeed.

## Quick start

Create a key in [your Comfy workspace](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:** `wavespeed/flashvsr`

**Endpoint:** `POST https://api.comfy.org/v2/models/wavespeed/flashvsr`

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

  # Reads COMFY_API_KEY from the environment.
  # The SDK automatically creates an idempotency key and reuses it for automatic retries.
  with Comfy() as client:
      result = client.models.run(
          "wavespeed/flashvsr",
          {
              "duration": 4,
              "target_resolution": "1080p",
              "video": "https://samplelib.com/mp4/sample-30s.mp4",
          },
      )

  print(result)
  ```

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

  // Reads COMFY_API_KEY from the environment.
  // The SDK automatically creates an idempotency key and reuses it for automatic retries.
  const { data } = await comfy.models.run("wavespeed/flashvsr", {
    duration: 4,
    target_resolution: "1080p",
    video: "https://samplelib.com/mp4/sample-30s.mp4",
  });

  console.log(data);
  ```

  ```bash cURL theme={null}
  curl https://api.comfy.org/v2/models/wavespeed/flashvsr \
    -H "X-API-Key: $COMFY_API_KEY" \
    -H "Idempotency-Key: $(uuidgen)" \
    -H "Content-Type: application/json" \
    -d "{\"duration\": 4, \"target_resolution\": \"1080p\", \"video\": \"https://samplelib.com/mp4/sample-30s.mp4\"}"
  ```
</CodeGroup>

## Schema

### Input

<ParamField body="duration" type="number" required>
  Duration of the video in seconds
</ParamField>

<ParamField body="target_resolution" type="string" default="&#x22;1080p&#x22;">
  Target resolution to upscale to.

  Possible values: `720p`, `1080p`, `2k`, `4k`
</ParamField>

<ParamField body="video" type="string" required>
  The video to upscale. Can be a URL to the video file or a base64-encoded video.
</ParamField>

Generated from the schema Router serves at `GET /v2/models/wavespeed/flashvsr/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": 4,
  "target_resolution": "1080p",
  "video": "https://samplelib.com/mp4/sample-30s.mp4"
}
```

## Before you ship

The SDKs create an `Idempotency-Key` and reuse it for automatic retries. For manual retries, reuse the original key. Router can hold the connection for up to 10 minutes.

When a request fails, Router sends an `X-Comfy-Error-Type` response header explaining why. A `422` means Router rejected the input before calling the provider. Download generated assets promptly because [result URLs can expire](/development/comfy-router/reference#result-assets).

<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="Using the Router API" icon="code" href="/development/comfy-router/api">
    Model discovery, validation errors, retries, and billing.
  </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>