> ## 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 Ultimate Image Upscaler with Comfy Router

> Call wavespeed/ultimate-image-upscaler through Comfy Router: endpoint, request shape and the response Router returns.

API Reference for `wavespeed/ultimate-image-upscaler`, served by Comfy Router from WaveSpeed.

## 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:** `wavespeed/ultimate-image-upscaler`

**Endpoint:** `POST https://api.comfy.org/v2/models/wavespeed/ultimate-image-upscaler`

<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(
          "wavespeed/ultimate-image-upscaler",
          {
              "image": "https://images.pexels.com/photos/346529/pexels-photo-346529.jpeg",
              "target_resolution": "4k",
          },
      )

  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("wavespeed/ultimate-image-upscaler", {
    image: "https://images.pexels.com/photos/346529/pexels-photo-346529.jpeg",
    target_resolution: "4k",
  });

  console.log(data);
  ```

  ```bash cURL theme={null}
  curl https://api.comfy.org/v2/models/wavespeed/ultimate-image-upscaler \
    -H "X-API-Key: $COMFY_API_KEY" \
    -H "Idempotency-Key: $(uuidgen)" \
    -H "Content-Type: application/json" \
    -d "{\"image\": \"https://images.pexels.com/photos/346529/pexels-photo-346529.jpeg\", \"target_resolution\": \"4k\"}"
  ```
</CodeGroup>

## Schema

### Input

<ParamField body="enable_base64_output" type="boolean" default="false">
  If enabled, the output will be encoded into a BASE64 string instead of a URL.
</ParamField>

<ParamField body="image" type="string" required>
  The URL of the image to upscale.
</ParamField>

<ParamField body="output_format" type="string" default="&#x22;jpeg&#x22;">
  The format of the output image.

  Possible values: `jpeg`, `png`, `webp`
</ParamField>

<ParamField body="target_resolution" type="string" default="&#x22;4k&#x22;">
  The target resolution of the output image.

  Possible values: `2k`, `4k`, `8k`
</ParamField>

Generated from the schema Router serves at `GET /v2/models/wavespeed/ultimate-image-upscaler/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}
{
  "image": "https://images.pexels.com/photos/346529/pexels-photo-346529.jpeg",
  "target_resolution": "4k"
}
```

## 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>