# Aura SR (`aura_sr`)

> Aura SR image upscaler. Free on provider, minimal cost.

- Capability: Images (tool `image`) — Image to image
- Price: see POST /v2/estimate
- Typical time: ~30 s
- JSON Schema: https://api.varg.ai/v2/tools/image?model=aura_sr (public, no key)
- Try it: https://varg.ai/dashboard/tools/playground?model=aura_sr

## Call it

REST: `POST https://api.varg.ai/v2/tools/image/call` with `Authorization: Bearer $VARG_API_KEY` (create a key at https://varg.ai/dashboard/api).
It answers `202` with a job right away. Poll `GET /v2/jobs/{id}` until `status` is `completed`, then read `output.outputs[0].url` — or pass `options.webhook_url` and get the finished job POSTed to you.

```bash
curl -X POST https://api.varg.ai/v2/tools/image/call \
  -H "Authorization: Bearer $VARG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "aura_sr",
  "files": [
    {
      "url": "https://example.com/input.png"
    }
  ]
}'
```

MCP: the varg server `https://mcp.varg.ai/mcp` (OAuth sign-in, no key) runs it with `call_tool`:

```json
{
  "tool": "image",
  "input": {
    "model": "aura_sr",
    "files": [
      {
        "url": "https://example.com/input.png"
      }
    ]
  },
  "wait": true
}
```

## Inputs

| field | type | required | default | allowed | description |
|---|---|---|---|---|---|
| `model` | string | yes | — | `aura_sr` or a route key below | Which model runs the job. |
| `prompt` | string | no | — | — | — |
| `files` | array of { url } | no | — | — | — |
| `aspect_ratio` | string | no | — | e.g. 16:9 \| 9:16 \| 1:1 \| 4:3 \| 3:4 \| 21:9 \| auto | — |

Media inputs are URLs. Upload a local file first with `POST /v2/files` and pass the returned URL.

## Provider options

Optional, per provider, under `provider_options.<provider>`. Only the options of the provider that runs the job apply — pin a route to choose it.

### provider_options.fal

| field | type | required | default | allowed | description |
|---|---|---|---|---|---|
| `image_url` | string (URL) | no | — | — | URL of the image to upscale. |
| `checkpoint` | string | no | — | v1 \| v2 | — |
| `upscale_factor` | integer | no | — | -9007199254740991–9007199254740991 | Upscaling factor. More coming soon. |
| `overlapping_tiles` | boolean | no | — | — | Whether to use overlapping tiles for upscaling. Setting this to true helps remove seams but doubles the inference time. |

## Routes

`"model": "aura_sr"` picks a route automatically (priority order, then the inputs you send). To pin one, pass its key as `model`.

| model key | provider | modality | price from | typical time |
|---|---|---|---|---|
| `fal:aura_sr` | fal | image-to-image | — | ~30 s |

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Catalog version 2026-11-11T12:59:09.901887+00:00. All models: https://varg.ai/models/llms.txt